BELLE2-CONF-PH-2020-001

Belle II Collaboration

#
Charmless $B$ decay reconstruction in 2019 Belle II data

F. Abudinén  INFN Sezione di Trieste, I-34127 Trieste, Italy  I. Adachi  High
Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The
Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan
R. Adak  Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and
Institute of Modern Physics, Fudan University, Shanghai 200443, China  K.
Adamczyk  H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342,
Poland  P. Ahlburg  University of Bonn, 53115 Bonn, Germany  J. K. Ahn  Korea
University, Seoul 02841, South Korea  H. Aihara  Department of Physics,
University of Tokyo, Tokyo 113-0033, Japan  N. Akopov  Alikhanyan National
Science Laboratory, Yerevan 0036, Armenia  A. Aloisio  Dipartimento di Scienze
Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy  INFN Sezione
di Napoli, I-80126 Napoli, Italy  F. Ameli  INFN Sezione di Roma, I-00185
Roma, Italy  L. Andricek  Semiconductor Laboratory of the Max Planck Society,
81739 München, Germany  N. Anh Ky  Institute of Physics, Vietnam Academy of
Science and Technology (VAST), Hanoi, Vietnam  D. M. Asner  Brookhaven
National Laboratory, Upton, New York 11973, U.S.A.  H. Atmacan  University of
Cincinnati, Cincinnati, Ohio 45221, U.S.A.  V. Aulchenko  Budker Institute of
Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation  Novosibirsk
State University, Novosibirsk 630090, Russian Federation  T. Aushev  Higher
School of Economics (HSE), Moscow 101000, Russian Federation  V. Aushev  Taras
Shevchenko National Univ. of Kiev, Kiev, Ukraine  T. Aziz  Tata Institute of
Fundamental Research, Mumbai 400005, India  V. Babu  Deutsches
Elektronen–Synchrotron, 22607 Hamburg, Germany  S. Bacher  H. Niewodniczanski
Institute of Nuclear Physics, Krakow 31-342, Poland  S. Baehr  Institut für
Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131
Karlsruhe, Germany  S. Bahinipati  Indian Institute of Technology Bhubaneswar,
Satya Nagar 751007, India  A. M. Bakich  School of Physics, University of
Sydney, New South Wales 2006, Australia  P. Bambade  Université Paris-Saclay,
CNRS/IN2P3, IJCLab, 91405 Orsay, France  Sw. Banerjee  University of
Louisville, Louisville, Kentucky 40292, U.S.A.  S. Bansal  Panjab University,
Chandigarh 160014, India  M. Barrett  High Energy Accelerator Research
Organization (KEK), Tsukuba 305-0801, Japan  W. Bartel  Deutsches
Elektronen–Synchrotron, 22607 Hamburg, Germany  G. Batignani  Dipartimento di
Fisica, Università di Pisa, I-56127 Pisa, Italy  INFN Sezione di Pisa, I-56127
Pisa, Italy  J. Baudot  Université de Strasbourg, CNRS, IPHC, UMR 7178, 67037
Strasbourg, France  A. Beaulieu  University of Victoria, Victoria, British
Columbia, V8W 3P6, Canada  J. Becker  Institut für Experimentelle
Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
P. K. Behera  Indian Institute of Technology Madras, Chennai 600036, India  M.
Bender  Ludwig Maximilians University, 80539 Munich, Germany  J. V. Bennett
University of Mississippi, University, Mississippi 38677, U.S.A.  E. Bernieri
INFN Sezione di Roma Tre, I-00146 Roma, Italy  F. U. Bernlochner  University
of Bonn, 53115 Bonn, Germany  M. Bertemes  Institute of High Energy Physics,
Vienna 1050, Austria  M. Bessner  University of Hawaii, Honolulu, Hawaii
96822, U.S.A.  S. Bettarini  Dipartimento di Fisica, Università di Pisa,
I-56127 Pisa, Italy  INFN Sezione di Pisa, I-56127 Pisa, Italy  V. Bhardwaj
Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306,
India  B. Bhuyan  Indian Institute of Technology Guwahati, Assam 781039, India
F. Bianchi  Dipartimento di Fisica, Università di Torino, I-10125 Torino,
Italy  INFN Sezione di Torino, I-10125 Torino, Italy  T. Bilka  Faculty of
Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic  S.
Bilokin  Ludwig Maximilians University, 80539 Munich, Germany  D. Biswas
University of Louisville, Louisville, Kentucky 40292, U.S.A.  A. Bobrov
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian
Federation  Novosibirsk State University, Novosibirsk 630090, Russian
Federation  A. Bondar  Budker Institute of Nuclear Physics SB RAS, Novosibirsk
630090, Russian Federation  Novosibirsk State University, Novosibirsk 630090,
Russian Federation  G. Bonvicini  Wayne State University, Detroit, Michigan
48202, U.S.A.  A. Bozek  H. Niewodniczanski Institute of Nuclear Physics,
Krakow 31-342, Poland  M. Bračko  University of Maribor, 2000 Maribor,
Slovenia  J. Stefan Institute, 1000 Ljubljana, Slovenia  P. Branchini  INFN
Sezione di Roma Tre, I-00146 Roma, Italy  N. Braun  Institut für
Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131
Karlsruhe, Germany  R. A. Briere  Carnegie Mellon University, Pittsburgh,
Pennsylvania 15213, U.S.A.  T. E. Browder  University of Hawaii, Honolulu,
Hawaii 96822, U.S.A.  D. N. Brown  University of Louisville, Louisville,
Kentucky 40292, U.S.A.  A. Budano  INFN Sezione di Roma Tre, I-00146 Roma,
Italy  L. Burmistrov  Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405
Orsay, France  S. Bussino  Dipartimento di Matematica e Fisica, Università di
Roma Tre, I-00146 Roma, Italy  INFN Sezione di Roma Tre, I-00146 Roma, Italy
M. Campajola  Dipartimento di Scienze Fisiche, Università di Napoli Federico
II, I-80126 Napoli, Italy  INFN Sezione di Napoli, I-80126 Napoli, Italy  L.
Cao  University of Bonn, 53115 Bonn, Germany  G. Caria  School of Physics,
University of Melbourne, Victoria 3010, Australia  G. Casarosa  Dipartimento
di Fisica, Università di Pisa, I-56127 Pisa, Italy  INFN Sezione di Pisa,
I-56127 Pisa, Italy  C. Cecchi  Dipartimento di Fisica, Università di Perugia,
I-06123 Perugia, Italy  INFN Sezione di Perugia, I-06123 Perugia, Italy  D.
Červenkov  Faculty of Mathematics and Physics, Charles University, 121 16
Prague, Czech Republic  M.-C. Chang  Department of Physics, Fu Jen Catholic
University, Taipei 24205, Taiwan  P. Chang  Department of Physics, National
Taiwan University, Taipei 10617, Taiwan  R. Cheaib  University of British
Columbia, Vancouver, British Columbia, V6T 1Z1, Canada  V. Chekelian  Max-
Planck-Institut für Physik, 80805 München, Germany  Y. Q. Chen  University of
Science and Technology of China, Hefei 230026, China  Y.-T. Chen  Department
of Physics, National Taiwan University, Taipei 10617, Taiwan  B. G. Cheon
Department of Physics and Institute of Natural Sciences, Hanyang University,
Seoul 04763, South Korea  K. Chilikin  P.N. Lebedev Physical Institute of the
Russian Academy of Sciences, Moscow 119991, Russian Federation  H.-E. Cho
Department of Physics and Institute of Natural Sciences, Hanyang University,
Seoul 04763, South Korea  K. Cho  Korea Institute of Science and Technology
Information, Daejeon 34141, South Korea  S.-J. Cho  Yonsei University, Seoul
03722, South Korea  S.-K. Choi  Gyeongsang National University, Jinju 52828,
South Korea  S. Choudhury  Indian Institute of Technology Hyderabad, Telangana
502285, India  D. Cinabro  Wayne State University, Detroit, Michigan 48202,
U.S.A.  L. Corona  Dipartimento di Fisica, Università di Pisa, I-56127 Pisa,
Italy  INFN Sezione di Pisa, I-56127 Pisa, Italy  L. M. Cremaldi  University
of Mississippi, University, Mississippi 38677, U.S.A.  D. Cuesta  Université
de Strasbourg, CNRS, IPHC, UMR 7178, 67037 Strasbourg, France  S. Cunliffe
Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  T. Czank  Kavli
Institute for the Physics and Mathematics of the Universe (WPI), University of
Tokyo, Kashiwa 277-8583, Japan  N. Dash  Indian Institute of Technology
Madras, Chennai 600036, India  F. Dattola  Deutsches Elektronen–Synchrotron,
22607 Hamburg, Germany  E. De La Cruz-Burelo  Centro de Investigacion y de
Estudios Avanzados del Instituto Politecnico Nacional, Mexico City 07360,
Mexico  Consejo Nacional de Ciencia y Tecnología, Mexico City 03940, Mexico
G. De Nardo  Dipartimento di Scienze Fisiche, Università di Napoli Federico
II, I-80126 Napoli, Italy  INFN Sezione di Napoli, I-80126 Napoli, Italy  M.
De Nuccio  Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  G. De
Pietro  INFN Sezione di Roma Tre, I-00146 Roma, Italy  R. de Sangro  INFN
Laboratori Nazionali di Frascati, I-00044 Frascati, Italy  B. Deschamps
University of Bonn, 53115 Bonn, Germany  M. Destefanis  Dipartimento di
Fisica, Università di Torino, I-10125 Torino, Italy  INFN Sezione di Torino,
I-10125 Torino, Italy  S. Dey  Tel Aviv University, School of Physics and
Astronomy, Tel Aviv, 69978, Israel  A. De Yta-Hernandez  Centro de
Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional,
Mexico City 07360, Mexico  F. Di Capua  Dipartimento di Scienze Fisiche,
Università di Napoli Federico II, I-80126 Napoli, Italy  INFN Sezione di
Napoli, I-80126 Napoli, Italy  S. Di Carlo  Université Paris-Saclay,
CNRS/IN2P3, IJCLab, 91405 Orsay, France  J. Dingfelder  University of Bonn,
53115 Bonn, Germany  Z. Doležal  Faculty of Mathematics and Physics, Charles
University, 121 16 Prague, Czech Republic  I. Domínguez Jiménez  Universidad
Autonoma de Sinaloa, Sinaloa 80000, Mexico  T. V. Dong  Key Laboratory of
Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern
Physics, Fudan University, Shanghai 200443, China  K. Dort  Justus-Liebig-
Universität Gießen, 35392 Gießen, Germany  D. Dossett  School of Physics,
University of Melbourne, Victoria 3010, Australia  S. Dubey  University of
Hawaii, Honolulu, Hawaii 96822, U.S.A.  S. Duell  University of Bonn, 53115
Bonn, Germany  G. Dujany  Université de Strasbourg, CNRS, IPHC, UMR 7178,
67037 Strasbourg, France  S. Eidelman  Budker Institute of Nuclear Physics SB
RAS, Novosibirsk 630090, Russian Federation  P.N. Lebedev Physical Institute
of the Russian Academy of Sciences, Moscow 119991, Russian Federation
Novosibirsk State University, Novosibirsk 630090, Russian Federation  M.
Eliachevitch  University of Bonn, 53115 Bonn, Germany  D. Epifanov  Budker
Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
Novosibirsk State University, Novosibirsk 630090, Russian Federation  J. E.
Fast  Pacific Northwest National Laboratory, Richland, Washington 99352,
U.S.A.  T. Ferber  Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany
D. Ferlewicz  School of Physics, University of Melbourne, Victoria 3010,
Australia  G. Finocchiaro  INFN Laboratori Nazionali di Frascati, I-00044
Frascati, Italy  S. Fiore  INFN Sezione di Roma, I-00185 Roma, Italy  P.
Fischer  University of Heidelberg, 68131 Mannheim, Germany  A. Fodor  McGill
University, Montréal, Québec, H3A 2T8, Canada  F. Forti  Dipartimento di
Fisica, Università di Pisa, I-56127 Pisa, Italy  INFN Sezione di Pisa, I-56127
Pisa, Italy  A. Frey  II. Physikalisches Institut, Georg-August-Universität
Göttingen, 37073 Göttingen, Germany  M. Friedl  Institute of High Energy
Physics, Vienna 1050, Austria  B. G. Fulsom  Pacific Northwest National
Laboratory, Richland, Washington 99352, U.S.A.  M. Gabriel  Max-Planck-
Institut für Physik, 80805 München, Germany  N. Gabyshev  Budker Institute of
Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation  Novosibirsk
State University, Novosibirsk 630090, Russian Federation  E. Ganiev
Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy  INFN
Sezione di Trieste, I-34127 Trieste, Italy  M. Garcia-Hernandez  Centro de
Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional,
Mexico City 07360, Mexico  R. Garg  Panjab University, Chandigarh 160014,
India  A. Garmash  Budker Institute of Nuclear Physics SB RAS, Novosibirsk
630090, Russian Federation  Novosibirsk State University, Novosibirsk 630090,
Russian Federation  V. Gaur  Virginia Polytechnic Institute and State
University, Blacksburg, Virginia 24061, U.S.A.  A. Gaz  Graduate School of
Science, Nagoya University, Nagoya 464-8602, Japan  Kobayashi-Maskawa
Institute, Nagoya University, Nagoya 464-8602, Japan  U. Gebauer  II.
Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen,
Germany  M. Gelb  Institut für Experimentelle Teilchenphysik, Karlsruher
Institut für Technologie, 76131 Karlsruhe, Germany  A. Gellrich  Deutsches
Elektronen–Synchrotron, 22607 Hamburg, Germany  J. Gemmler  Institut für
Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131
Karlsruhe, Germany  T. Geßler  Justus-Liebig-Universität Gießen, 35392 Gießen,
Germany  D. Getzkow  Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
R. Giordano  Dipartimento di Scienze Fisiche, Università di Napoli Federico
II, I-80126 Napoli, Italy  INFN Sezione di Napoli, I-80126 Napoli, Italy  A.
Giri  Indian Institute of Technology Hyderabad, Telangana 502285, India  A.
Glazov  Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  B. Gobbo
INFN Sezione di Trieste, I-34127 Trieste, Italy  R. Godang  University of
South Alabama, Mobile, Alabama 36688, U.S.A.  P. Goldenzweig  Institut für
Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131
Karlsruhe, Germany  B. Golob  Faculty of Mathematics and Physics, University
of Ljubljana, 1000 Ljubljana, Slovenia  J. Stefan Institute, 1000 Ljubljana,
Slovenia  P. Gomis  Instituto de Fisica Corpuscular, Paterna 46980, Spain  P.
Grace  Department of Physics, University of Adelaide, Adelaide, South
Australia 5005, Australia  W. Gradl  Johannes Gutenberg-Universität Mainz,
Institut für Kernphysik, D-55099 Mainz, Germany  E. Graziani  INFN Sezione di
Roma Tre, I-00146 Roma, Italy  D. Greenwald  Department of Physics, Technische
Universität München, 85748 Garching, Germany  Y. Guan  University of
Cincinnati, Cincinnati, Ohio 45221, U.S.A.  C. Hadjivasiliou  Pacific
Northwest National Laboratory, Richland, Washington 99352, U.S.A.  S. Halder
Tata Institute of Fundamental Research, Mumbai 400005, India  K. Hara  High
Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The
Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan
T. Hara  High Energy Accelerator Research Organization (KEK), Tsukuba
305-0801, Japan  The Graduate University for Advanced Studies (SOKENDAI),
Hayama 240-0193, Japan  O. Hartbrich  University of Hawaii, Honolulu, Hawaii
96822, U.S.A.  T. Hauth  Institut für Experimentelle Teilchenphysik,
Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany  K. Hayasaka
Niigata University, Niigata 950-2181, Japan  H. Hayashii  Nara Women’s
University, Nara 630-8506, Japan  C. Hearty  University of British Columbia,
Vancouver, British Columbia, V6T 1Z1, Canada  Institute of Particle Physics
(Canada), Victoria, British Columbia V8W 2Y2, Canada  M. Heck  Institut für
Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131
Karlsruhe, Germany  M. T. Hedges  University of Hawaii, Honolulu, Hawaii
96822, U.S.A.  I. Heredia de la Cruz  Centro de Investigacion y de Estudios
Avanzados del Instituto Politecnico Nacional, Mexico City 07360, Mexico
Consejo Nacional de Ciencia y Tecnología, Mexico City 03940, Mexico  M.
Hernández Villanueva  University of Mississippi, University, Mississippi
38677, U.S.A.  A. Hershenhorn  University of British Columbia, Vancouver,
British Columbia, V6T 1Z1, Canada  T. Higuchi  Kavli Institute for the Physics
and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583,
Japan  E. C. Hill  University of British Columbia, Vancouver, British
Columbia, V6T 1Z1, Canada  H. Hirata  Graduate School of Science, Nagoya
University, Nagoya 464-8602, Japan  S. Hirose  Graduate School of Science,
Nagoya University, Nagoya 464-8602, Japan  M. Hoek  Johannes Gutenberg-
Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany  M. Hohmann
School of Physics, University of Melbourne, Victoria 3010, Australia  S.
Hollitt  Department of Physics, University of Adelaide, Adelaide, South
Australia 5005, Australia  T. Hotta  Research Center for Nuclear Physics,
Osaka University, Osaka 567-0047, Japan  C.-L. Hsu  School of Physics,
University of Sydney, New South Wales 2006, Australia  Y. Hu  Institute of
High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China  K.
Huang  Department of Physics, National Taiwan University, Taipei 10617, Taiwan
T. Iijima  Graduate School of Science, Nagoya University, Nagoya 464-8602,
Japan  Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602, Japan
K. Inami  Graduate School of Science, Nagoya University, Nagoya 464-8602,
Japan  G. Inguglia  Institute of High Energy Physics, Vienna 1050, Austria  J.
Irakkathil Jabbar  Institut für Experimentelle Teilchenphysik, Karlsruher
Institut für Technologie, 76131 Karlsruhe, Germany  A. Ishikawa  High Energy
Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The Graduate
University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan  R. Itoh
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193,
Japan  M. Iwasaki  Osaka City University, Osaka 558-8585, Japan  Y. Iwasaki
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
S. Iwata  Tokyo Metropolitan University, Tokyo 192-0397, Japan  P. Jackson
Department of Physics, University of Adelaide, Adelaide, South Australia 5005,
Australia  W. W. Jacobs  Indiana University, Bloomington, Indiana 47408,
U.S.A.  I. Jaegle  University of Florida, Gainesville, Florida 32611, U.S.A.
D. E. Jaffe  Brookhaven National Laboratory, Upton, New York 11973, U.S.A.
E.-J. Jang  Gyeongsang National University, Jinju 52828, South Korea  M.
Jeandron  University of Mississippi, University, Mississippi 38677, U.S.A.  H.
B. Jeon  Kyungpook National University, Daegu 41566, South Korea  S. Jia
Beihang University, Beijing 100191, China  Y. Jin  INFN Sezione di Trieste,
I-34127 Trieste, Italy  C. Joo  Kavli Institute for the Physics and
Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583,
Japan  K. K. Joo  Chonnam National University, Gwangju 61186, South Korea  I.
Kadenko  Taras Shevchenko National Univ. of Kiev, Kiev, Ukraine  J. Kahn
Institut für Experimentelle Teilchenphysik, Karlsruher Institut für
Technologie, 76131 Karlsruhe, Germany  H. Kakuno  Tokyo Metropolitan
University, Tokyo 192-0397, Japan  A. B. Kaliyar  Tata Institute of
Fundamental Research, Mumbai 400005, India  J. Kandra  Faculty of Mathematics
and Physics, Charles University, 121 16 Prague, Czech Republic  K. H. Kang
Kyungpook National University, Daegu 41566, South Korea  P. Kapusta  H.
Niewodniczanski Institute of Nuclear Physics, Krakow 31-342, Poland  G. Karyan
Alikhanyan National Science Laboratory, Yerevan 0036, Armenia  Y. Kato
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602, Japan  H.
Kawai  Chiba University, Chiba 263-8522, Japan  T. Kawasaki  Kitasato
University, Sagamihara 252-0373, Japan  T. Keck  Institut für Experimentelle
Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
C. Ketter  University of Hawaii, Honolulu, Hawaii 96822, U.S.A.  H. Kichimi
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
C. Kiesling  Max-Planck-Institut für Physik, 80805 München, Germany  B. H. Kim
Seoul National University, Seoul 08826, South Korea  C.-H. Kim  Department of
Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763,
South Korea  D. Y. Kim  Soongsil University, Seoul 06978, South Korea  H. J.
Kim  Kyungpook National University, Daegu 41566, South Korea  J. B. Kim  Korea
University, Seoul 02841, South Korea  K.-H. Kim  Yonsei University, Seoul
03722, South Korea  K. Kim  Korea University, Seoul 02841, South Korea  S.-H.
Kim  Seoul National University, Seoul 08826, South Korea  Y.-K. Kim  Yonsei
University, Seoul 03722, South Korea  Y. Kim  Korea University, Seoul 02841,
South Korea  T. D. Kimmel  Virginia Polytechnic Institute and State
University, Blacksburg, Virginia 24061, U.S.A.  H. Kindo  High Energy
Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The Graduate
University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan  K.
Kinoshita  University of Cincinnati, Cincinnati, Ohio 45221, U.S.A.  B. Kirby
Brookhaven National Laboratory, Upton, New York 11973, U.S.A.  C. Kleinwort
Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  B. Knysh  Université
Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France  P. Kodyš  Faculty of
Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic  T.
Koga  High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801,
Japan  S. Kohani  University of Hawaii, Honolulu, Hawaii 96822, U.S.A.  S.
Koirala  Department of Physics, National Taiwan University, Taipei 10617,
Taiwan  I. Komarov  Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany
T. Konno  Kitasato University, Sagamihara 252-0373, Japan  S. Korpar
University of Maribor, 2000 Maribor, Slovenia  J. Stefan Institute, 1000
Ljubljana, Slovenia  N. Kovalchuk  Deutsches Elektronen–Synchrotron, 22607
Hamburg, Germany  T. M. G. Kraetzschmar  Max-Planck-Institut für Physik, 80805
München, Germany  P. Križan  Faculty of Mathematics and Physics, University of
Ljubljana, 1000 Ljubljana, Slovenia  J. Stefan Institute, 1000 Ljubljana,
Slovenia  R. Kroeger  University of Mississippi, University, Mississippi
38677, U.S.A.  J. F. Krohn  School of Physics, University of Melbourne,
Victoria 3010, Australia  P. Krokovny  Budker Institute of Nuclear Physics SB
RAS, Novosibirsk 630090, Russian Federation  Novosibirsk State University,
Novosibirsk 630090, Russian Federation  H. Krüger  University of Bonn, 53115
Bonn, Germany  W. Kuehn  Justus-Liebig-Universität Gießen, 35392 Gießen,
Germany  T. Kuhr  Ludwig Maximilians University, 80539 Munich, Germany  J.
Kumar  Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, U.S.A.  M.
Kumar  Malaviya National Institute of Technology Jaipur, Jaipur 302017, India
R. Kumar  Punjab Agricultural University, Ludhiana 141004, India  K. Kumara
Wayne State University, Detroit, Michigan 48202, U.S.A.  T. Kumita  Tokyo
Metropolitan University, Tokyo 192-0397, Japan  T. Kunigo  High Energy
Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  M. Künzel
Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  Ludwig Maximilians
University, 80539 Munich, Germany  S. Kurz  Deutsches Elektronen–Synchrotron,
22607 Hamburg, Germany  A. Kuzmin  Budker Institute of Nuclear Physics SB RAS,
Novosibirsk 630090, Russian Federation  Novosibirsk State University,
Novosibirsk 630090, Russian Federation  P. Kvasnička  Faculty of Mathematics
and Physics, Charles University, 121 16 Prague, Czech Republic  Y.-J. Kwon
Yonsei University, Seoul 03722, South Korea  S. Lacaprara  INFN Sezione di
Padova, I-35131 Padova, Italy  Y.-T. Lai  High Energy Accelerator Research
Organization (KEK), Tsukuba 305-0801, Japan  C. La Licata  Kavli Institute for
the Physics and Mathematics of the Universe (WPI), University of Tokyo,
Kashiwa 277-8583, Japan  K. Lalwani  Malaviya National Institute of Technology
Jaipur, Jaipur 302017, India  L. Lanceri  INFN Sezione di Trieste, I-34127
Trieste, Italy  J. S. Lange  Justus-Liebig-Universität Gießen, 35392 Gießen,
Germany  K. Lautenbach  Justus-Liebig-Universität Gießen, 35392 Gießen,
Germany  P. J. Laycock  Brookhaven National Laboratory, Upton, New York 11973,
U.S.A.  F. R. Le Diberder  Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405
Orsay, France  I.-S. Lee  Department of Physics and Institute of Natural
Sciences, Hanyang University, Seoul 04763, South Korea  S. C. Lee  Kyungpook
National University, Daegu 41566, South Korea  P. Leitl  Max-Planck-Institut
für Physik, 80805 München, Germany  D. Levit  Department of Physics,
Technische Universität München, 85748 Garching, Germany  P. M. Lewis
University of Bonn, 53115 Bonn, Germany  C. Li  Liaoning Normal University,
Dalian 116029, China  L. K. Li  University of Cincinnati, Cincinnati, Ohio
45221, U.S.A.  S. X. Li  Beihang University, Beijing 100191, China  Y. M. Li
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049,
China  Y. B. Li  Peking University, Beijing 100871, China  J. Libby  Indian
Institute of Technology Madras, Chennai 600036, India  K. Lieret  Ludwig
Maximilians University, 80539 Munich, Germany  L. Li Gioi  Max-Planck-Institut
für Physik, 80805 München, Germany  J. Lin  Department of Physics, National
Taiwan University, Taipei 10617, Taiwan  Z. Liptak  University of Hawaii,
Honolulu, Hawaii 96822, U.S.A.  Q. Y. Liu  Key Laboratory of Nuclear Physics
and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan
University, Shanghai 200443, China  Z. A. Liu  Institute of High Energy
Physics, Chinese Academy of Sciences, Beijing 100049, China  D. Liventsev
Wayne State University, Detroit, Michigan 48202, U.S.A.  High Energy
Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  S. Longo
Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  A. Loos  University
of South Carolina, Columbia, South Carolina 29208, U.S.A.  P. Lu  Department
of Physics, National Taiwan University, Taipei 10617, Taiwan  M. Lubej  J.
Stefan Institute, 1000 Ljubljana, Slovenia  T. Lueck  Ludwig Maximilians
University, 80539 Munich, Germany  F. Luetticke  University of Bonn, 53115
Bonn, Germany  T. Luo  Key Laboratory of Nuclear Physics and Ion-beam
Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai
200443, China  C. MacQueen  School of Physics, University of Melbourne,
Victoria 3010, Australia  Y. Maeda  Graduate School of Science, Nagoya
University, Nagoya 464-8602, Japan  Kobayashi-Maskawa Institute, Nagoya
University, Nagoya 464-8602, Japan  M. Maggiora  Dipartimento di Fisica,
Università di Torino, I-10125 Torino, Italy  INFN Sezione di Torino, I-10125
Torino, Italy  S. Maity  Indian Institute of Technology Bhubaneswar, Satya
Nagar 751007, India  R. Manfredi  Dipartimento di Fisica, Università di
Trieste, I-34127 Trieste, Italy  INFN Sezione di Trieste, I-34127 Trieste,
Italy  E. Manoni  INFN Sezione di Perugia, I-06123 Perugia, Italy  S. Marcello
Dipartimento di Fisica, Università di Torino, I-10125 Torino, Italy  INFN
Sezione di Torino, I-10125 Torino, Italy  C. Marinas  Instituto de Fisica
Corpuscular, Paterna 46980, Spain  A. Martini  Dipartimento di Matematica e
Fisica, Università di Roma Tre, I-00146 Roma, Italy  INFN Sezione di Roma Tre,
I-00146 Roma, Italy  M. Masuda  Earthquake Research Institute, University of
Tokyo, Tokyo 113-0032, Japan  Research Center for Nuclear Physics, Osaka
University, Osaka 567-0047, Japan  T. Matsuda  University of Miyazaki,
Miyazaki 889-2192, Japan  K. Matsuoka  Graduate School of Science, Nagoya
University, Nagoya 464-8602, Japan  Kobayashi-Maskawa Institute, Nagoya
University, Nagoya 464-8602, Japan  D. Matvienko  Budker Institute of Nuclear
Physics SB RAS, Novosibirsk 630090, Russian Federation  P.N. Lebedev Physical
Institute of the Russian Academy of Sciences, Moscow 119991, Russian
Federation  Novosibirsk State University, Novosibirsk 630090, Russian
Federation  J. McNeil  University of Florida, Gainesville, Florida 32611,
U.S.A.  F. Meggendorfer  Max-Planck-Institut für Physik, 80805 München,
Germany  J. C. Mei  Key Laboratory of Nuclear Physics and Ion-beam Application
(MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443,
China  F. Meier  Duke University, Durham, North Carolina 27708, U.S.A.  M.
Merola  Dipartimento di Scienze Fisiche, Università di Napoli Federico II,
I-80126 Napoli, Italy  INFN Sezione di Napoli, I-80126 Napoli, Italy  F.
Metzner  Institut für Experimentelle Teilchenphysik, Karlsruher Institut für
Technologie, 76131 Karlsruhe, Germany  M. Milesi  School of Physics,
University of Melbourne, Victoria 3010, Australia  C. Miller  University of
Victoria, Victoria, British Columbia, V8W 3P6, Canada  K. Miyabayashi  Nara
Women’s University, Nara 630-8506, Japan  H. Miyake  High Energy Accelerator
Research Organization (KEK), Tsukuba 305-0801, Japan  The Graduate University
for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan  H. Miyata  Niigata
University, Niigata 950-2181, Japan  R. Mizuk  P.N. Lebedev Physical Institute
of the Russian Academy of Sciences, Moscow 119991, Russian Federation  Higher
School of Economics (HSE), Moscow 101000, Russian Federation  K. Azmi
National Centre for Particle Physics, University Malaya, 50603 Kuala Lumpur,
Malaysia  G. B. Mohanty  Tata Institute of Fundamental Research, Mumbai
400005, India  H. Moon  Korea University, Seoul 02841, South Korea  T. Moon
Seoul National University, Seoul 08826, South Korea  J. A. Mora Grimaldo
Department of Physics, University of Tokyo, Tokyo 113-0033, Japan  A. Morda
INFN Sezione di Padova, I-35131 Padova, Italy  T. Morii  Kavli Institute for
the Physics and Mathematics of the Universe (WPI), University of Tokyo,
Kashiwa 277-8583, Japan  H.-G. Moser  Max-Planck-Institut für Physik, 80805
München, Germany  M. Mrvar  Institute of High Energy Physics, Vienna 1050,
Austria  F. Mueller  Max-Planck-Institut für Physik, 80805 München, Germany
F. J. Müller  Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  Th.
Muller  Institut für Experimentelle Teilchenphysik, Karlsruher Institut für
Technologie, 76131 Karlsruhe, Germany  G. Muroyama  Graduate School of
Science, Nagoya University, Nagoya 464-8602, Japan  R. Mussa  INFN Sezione di
Torino, I-10125 Torino, Italy  K. Nakagiri  High Energy Accelerator Research
Organization (KEK), Tsukuba 305-0801, Japan  I. Nakamura  High Energy
Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The Graduate
University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan  K. R.
Nakamura  High Energy Accelerator Research Organization (KEK), Tsukuba
305-0801, Japan  The Graduate University for Advanced Studies (SOKENDAI),
Hayama 240-0193, Japan  E. Nakano  Osaka City University, Osaka 558-8585,
Japan  M. Nakao  High Energy Accelerator Research Organization (KEK), Tsukuba
305-0801, Japan  The Graduate University for Advanced Studies (SOKENDAI),
Hayama 240-0193, Japan  H. Nakayama  High Energy Accelerator Research
Organization (KEK), Tsukuba 305-0801, Japan  The Graduate University for
Advanced Studies (SOKENDAI), Hayama 240-0193, Japan  H. Nakazawa  Department
of Physics, National Taiwan University, Taipei 10617, Taiwan  T. Nanut  J.
Stefan Institute, 1000 Ljubljana, Slovenia  Z. Natkaniec  H. Niewodniczanski
Institute of Nuclear Physics, Krakow 31-342, Poland  M. Nayak  Tel Aviv
University, School of Physics and Astronomy, Tel Aviv, 69978, Israel  G.
Nazaryan  Alikhanyan National Science Laboratory, Yerevan 0036, Armenia  D.
Neverov  Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
C. Niebuhr  Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  M.
Niiyama  Kyoto Sangyo University, Kyoto 603-8555, Japan  J. Ninkovic
Semiconductor Laboratory of the Max Planck Society, 81739 München, Germany  N.
K. Nisar  Brookhaven National Laboratory, Upton, New York 11973, U.S.A.  S.
Nishida  High Energy Accelerator Research Organization (KEK), Tsukuba
305-0801, Japan  The Graduate University for Advanced Studies (SOKENDAI),
Hayama 240-0193, Japan  K. Nishimura  University of Hawaii, Honolulu, Hawaii
96822, U.S.A.  M. Nishimura  High Energy Accelerator Research Organization
(KEK), Tsukuba 305-0801, Japan  M. H. A. Nouxman  National Centre for Particle
Physics, University Malaya, 50603 Kuala Lumpur, Malaysia  B. Oberhof  INFN
Laboratori Nazionali di Frascati, I-00044 Frascati, Italy  K. Ogawa  Niigata
University, Niigata 950-2181, Japan  S. Ogawa  Toho University, Funabashi
274-8510, Japan  S. L. Olsen  Gyeongsang National University, Jinju 52828,
South Korea  Y. Onishchuk  Taras Shevchenko National Univ. of Kiev, Kiev,
Ukraine  H. Ono  Niigata University, Niigata 950-2181, Japan  Y. Onuki
Department of Physics, University of Tokyo, Tokyo 113-0033, Japan  P. Oskin
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow
119991, Russian Federation  E. R. Oxford  Carnegie Mellon University,
Pittsburgh, Pennsylvania 15213, U.S.A.  H. Ozaki  High Energy Accelerator
Research Organization (KEK), Tsukuba 305-0801, Japan  The Graduate University
for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan  P. Pakhlov  P.N.
Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991,
Russian Federation  Moscow Physical Engineering Institute, Moscow 115409,
Russian Federation  G. Pakhlova  Higher School of Economics (HSE), Moscow
101000, Russian Federation  P.N. Lebedev Physical Institute of the Russian
Academy of Sciences, Moscow 119991, Russian Federation  A. Paladino
Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy  INFN Sezione
di Pisa, I-56127 Pisa, Italy  T. Pang  University of Pittsburgh, Pittsburgh,
Pennsylvania 15260, U.S.A.  A. Panta  University of Mississippi, University,
Mississippi 38677, U.S.A.  E. Paoloni  Dipartimento di Fisica, Università di
Pisa, I-56127 Pisa, Italy  INFN Sezione di Pisa, I-56127 Pisa, Italy  C. Park
Yonsei University, Seoul 03722, South Korea  H. Park  Kyungpook National
University, Daegu 41566, South Korea  S.-H. Park  Yonsei University, Seoul
03722, South Korea  B. Paschen  University of Bonn, 53115 Bonn, Germany  A.
Passeri  INFN Sezione di Roma Tre, I-00146 Roma, Italy  A. Pathak  University
of Louisville, Louisville, Kentucky 40292, U.S.A.  S. Patra  Indian Institute
of Science Education and Research Mohali, SAS Nagar, 140306, India  S. Paul
Department of Physics, Technische Universität München, 85748 Garching, Germany
T. K. Pedlar  Luther College, Decorah, Iowa 52101, U.S.A.  I. Peruzzi  INFN
Laboratori Nazionali di Frascati, I-00044 Frascati, Italy  R. Peschke
University of Hawaii, Honolulu, Hawaii 96822, U.S.A.  R. Pestotnik  J. Stefan
Institute, 1000 Ljubljana, Slovenia  M. Piccolo  INFN Laboratori Nazionali di
Frascati, I-00044 Frascati, Italy  L. E. Piilonen  Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061, U.S.A.  P. L. M.
Podesta-Lerma  Universidad Autonoma de Sinaloa, Sinaloa 80000, Mexico  V.
Popov  Higher School of Economics (HSE), Moscow 101000, Russian Federation  C.
Praz  Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  E. Prencipe
Forschungszentrum Jülich, 52425 Jülich, Germany  M. T. Prim  Institut für
Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131
Karlsruhe, Germany  M. V. Purohit  Okinawa Institute of Science and
Technology, Okinawa 904-0495, Japan  P. Rados  Deutsches
Elektronen–Synchrotron, 22607 Hamburg, Germany  S. Raiz  Dipartimento di
Fisica, Università di Trieste, I-34127 Trieste, Italy  INFN Sezione di
Trieste, I-34127 Trieste, Italy  R. Rasheed  Université de Strasbourg, CNRS,
IPHC, UMR 7178, 67037 Strasbourg, France  M. Reif  Max-Planck-Institut für
Physik, 80805 München, Germany  S. Reiter  Justus-Liebig-Universität Gießen,
35392 Gießen, Germany  M. Remnev  Budker Institute of Nuclear Physics SB RAS,
Novosibirsk 630090, Russian Federation  Novosibirsk State University,
Novosibirsk 630090, Russian Federation  P. K. Resmi  Indian Institute of
Technology Madras, Chennai 600036, India  I. Ripp-Baudot  Université de
Strasbourg, CNRS, IPHC, UMR 7178, 67037 Strasbourg, France  M. Ritter  Ludwig
Maximilians University, 80539 Munich, Germany  M. Ritzert  University of
Heidelberg, 68131 Mannheim, Germany  G. Rizzo  Dipartimento di Fisica,
Università di Pisa, I-56127 Pisa, Italy  INFN Sezione di Pisa, I-56127 Pisa,
Italy  L. B. Rizzuto  J. Stefan Institute, 1000 Ljubljana, Slovenia  S. H.
Robertson  McGill University, Montréal, Québec, H3A 2T8, Canada  Institute of
Particle Physics (Canada), Victoria, British Columbia V8W 2Y2, Canada  D.
Rodríguez Pérez  Universidad Autonoma de Sinaloa, Sinaloa 80000, Mexico  J. M.
Roney  University of Victoria, Victoria, British Columbia, V8W 3P6, Canada
Institute of Particle Physics (Canada), Victoria, British Columbia V8W 2Y2,
Canada  C. Rosenfeld  University of South Carolina, Columbia, South Carolina
29208, U.S.A.  A. Rostomyan  Deutsches Elektronen–Synchrotron, 22607 Hamburg,
Germany  N. Rout  Indian Institute of Technology Madras, Chennai 600036, India
M. Rozanska  H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342,
Poland  S. Rummel  Ludwig Maximilians University, 80539 Munich, Germany  G.
Russo  Dipartimento di Scienze Fisiche, Università di Napoli Federico II,
I-80126 Napoli, Italy  INFN Sezione di Napoli, I-80126 Napoli, Italy  D. Sahoo
Tata Institute of Fundamental Research, Mumbai 400005, India  Y. Sakai  High
Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The
Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan
D. A. Sanders  University of Mississippi, University, Mississippi 38677,
U.S.A.  S. Sandilya  University of Cincinnati, Cincinnati, Ohio 45221, U.S.A.
A. Sangal  University of Cincinnati, Cincinnati, Ohio 45221, U.S.A.  L.
Santelj  Faculty of Mathematics and Physics, University of Ljubljana, 1000
Ljubljana, Slovenia  J. Stefan Institute, 1000 Ljubljana, Slovenia  P. Sartori
Dipartimento di Fisica e Astronomia, Università di Padova, I-35131 Padova,
Italy  INFN Sezione di Padova, I-35131 Padova, Italy  J. Sasaki  Department of
Physics, University of Tokyo, Tokyo 113-0033, Japan  Y. Sato  Department of
Physics, Tohoku University, Sendai 980-8578, Japan  V. Savinov  University of
Pittsburgh, Pittsburgh, Pennsylvania 15260, U.S.A.  B. Scavino  Johannes
Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany
M. Schram  Pacific Northwest National Laboratory, Richland, Washington 99352,
U.S.A.  H. Schreeck  II. Physikalisches Institut, Georg-August-Universität
Göttingen, 37073 Göttingen, Germany  J. Schueler  University of Hawaii,
Honolulu, Hawaii 96822, U.S.A.  C. Schwanda  Institute of High Energy Physics,
Vienna 1050, Austria  A. J. Schwartz  University of Cincinnati, Cincinnati,
Ohio 45221, U.S.A.  B. Schwenker  II. Physikalisches Institut, Georg-August-
Universität Göttingen, 37073 Göttingen, Germany  R. M. Seddon  McGill
University, Montréal, Québec, H3A 2T8, Canada  Y. Seino  Niigata University,
Niigata 950-2181, Japan  A. Selce  University of Bonn, 53115 Bonn, Germany  K.
Senyo  Yamagata University, Yamagata 990-8560, Japan  I. S. Seong  University
of Hawaii, Honolulu, Hawaii 96822, U.S.A.  M. E. Sevior  School of Physics,
University of Melbourne, Victoria 3010, Australia  C. Sfienti  Johannes
Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany
V. Shebalin  University of Hawaii, Honolulu, Hawaii 96822, U.S.A.  C. P. Shen
Beihang University, Beijing 100191, China  H. Shibuya  Toho University,
Funabashi 274-8510, Japan  J.-G. Shiu  Department of Physics, National Taiwan
University, Taipei 10617, Taiwan  B. Shwartz  Budker Institute of Nuclear
Physics SB RAS, Novosibirsk 630090, Russian Federation  Novosibirsk State
University, Novosibirsk 630090, Russian Federation  A. Sibidanov  University
of Victoria, Victoria, British Columbia, V8W 3P6, Canada  F. Simon  Max-
Planck-Institut für Physik, 80805 München, Germany  J. B. Singh  Panjab
University, Chandigarh 160014, India  S. Skambraks  Max-Planck-Institut für
Physik, 80805 München, Germany  K. Smith  School of Physics, University of
Melbourne, Victoria 3010, Australia  R. J. Sobie  University of Victoria,
Victoria, British Columbia, V8W 3P6, Canada  Institute of Particle Physics
(Canada), Victoria, British Columbia V8W 2Y2, Canada  A. Soffer  Tel Aviv
University, School of Physics and Astronomy, Tel Aviv, 69978, Israel  A.
Sokolov  Institute for High Energy Physics, Protvino 142281, Russian
Federation  Y. Soloviev  Deutsches Elektronen–Synchrotron, 22607 Hamburg,
Germany  E. Solovieva  P.N. Lebedev Physical Institute of the Russian Academy
of Sciences, Moscow 119991, Russian Federation  S. Spataro  Dipartimento di
Fisica, Università di Torino, I-10125 Torino, Italy  INFN Sezione di Torino,
I-10125 Torino, Italy  B. Spruck  Johannes Gutenberg-Universität Mainz,
Institut für Kernphysik, D-55099 Mainz, Germany  M. Starič  J. Stefan
Institute, 1000 Ljubljana, Slovenia  S. Stefkova  Deutsches
Elektronen–Synchrotron, 22607 Hamburg, Germany  Z. S. Stottler  Virginia
Polytechnic Institute and State University, Blacksburg, Virginia 24061, U.S.A.
R. Stroili  Dipartimento di Fisica e Astronomia, Università di Padova, I-35131
Padova, Italy  INFN Sezione di Padova, I-35131 Padova, Italy  J. Strube
Pacific Northwest National Laboratory, Richland, Washington 99352, U.S.A.  J.
Stypula  H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342,
Poland  M. Sumihama  Gifu University, Gifu 501-1193, Japan  Research Center
for Nuclear Physics, Osaka University, Osaka 567-0047, Japan  K. Sumisawa
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193,
Japan  T. Sumiyoshi  Tokyo Metropolitan University, Tokyo 192-0397, Japan  D.
J. Summers  University of Mississippi, University, Mississippi 38677, U.S.A.
W. Sutcliffe  University of Bonn, 53115 Bonn, Germany  K. Suzuki  Graduate
School of Science, Nagoya University, Nagoya 464-8602, Japan  S. Y. Suzuki
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193,
Japan  M. Tabata  Chiba University, Chiba 263-8522, Japan  M. Takahashi
Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  M. Takizawa
Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198, Japan
J-PARC Branch, KEK Theory Center, High Energy Accelerator Research
Organization (KEK), Tsukuba 305-0801, Japan  Showa Pharmaceutical University,
Tokyo 194-8543, Japan  U. Tamponi  INFN Sezione di Torino, I-10125 Torino,
Italy  S. Tanaka  High Energy Accelerator Research Organization (KEK), Tsukuba
305-0801, Japan  The Graduate University for Advanced Studies (SOKENDAI),
Hayama 240-0193, Japan  K. Tanida  Advanced Science Research Center, Japan
Atomic Energy Agency, Naka 319-1195, Japan  H. Tanigawa  Department of
Physics, University of Tokyo, Tokyo 113-0033, Japan  N. Taniguchi  High Energy
Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  Y. Tao
University of Florida, Gainesville, Florida 32611, U.S.A.  P. Taras
Université de Montréal, Physique des Particules, Montréal, Québec, H3C 3J7,
Canada  F. Tenchini  Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany
D. Tonelli  INFN Sezione di Trieste, I-34127 Trieste, Italy  E. Torassa  INFN
Sezione di Padova, I-35131 Padova, Italy  K. Trabelsi  Université Paris-
Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France  T. Tsuboyama  High Energy
Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The Graduate
University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan  N. Tsuzuki
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan  M.
Uchida  Tokyo Institute of Technology, Tokyo 152-8550, Japan  I. Ueda  High
Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The
Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan
S. Uehara  High Energy Accelerator Research Organization (KEK), Tsukuba
305-0801, Japan  The Graduate University for Advanced Studies (SOKENDAI),
Hayama 240-0193, Japan  T. Ueno  Department of Physics, Tohoku University,
Sendai 980-8578, Japan  T. Uglov  P.N. Lebedev Physical Institute of the
Russian Academy of Sciences, Moscow 119991, Russian Federation  Higher School
of Economics (HSE), Moscow 101000, Russian Federation  K. Unger  Institut für
Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131
Karlsruhe, Germany  Y. Unno  Department of Physics and Institute of Natural
Sciences, Hanyang University, Seoul 04763, South Korea  S. Uno  High Energy
Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  The Graduate
University for Advanced Studies (SOKENDAI), Hayama 240-0193, Japan  P. Urquijo
School of Physics, University of Melbourne, Victoria 3010, Australia  Y.
Ushiroda  High Energy Accelerator Research Organization (KEK), Tsukuba
305-0801, Japan  The Graduate University for Advanced Studies (SOKENDAI),
Hayama 240-0193, Japan  Department of Physics, University of Tokyo, Tokyo
113-0033, Japan  Y. Usov  Budker Institute of Nuclear Physics SB RAS,
Novosibirsk 630090, Russian Federation  Novosibirsk State University,
Novosibirsk 630090, Russian Federation  S. E. Vahsen  University of Hawaii,
Honolulu, Hawaii 96822, U.S.A.  R. van Tonder  University of Bonn, 53115 Bonn,
Germany  G. S. Varner  University of Hawaii, Honolulu, Hawaii 96822, U.S.A.
K. E. Varvell  School of Physics, University of Sydney, New South Wales 2006,
Australia  A. Vinokurova  Budker Institute of Nuclear Physics SB RAS,
Novosibirsk 630090, Russian Federation  Novosibirsk State University,
Novosibirsk 630090, Russian Federation  L. Vitale  Dipartimento di Fisica,
Università di Trieste, I-34127 Trieste, Italy  INFN Sezione di Trieste,
I-34127 Trieste, Italy  V. Vorobyev  Budker Institute of Nuclear Physics SB
RAS, Novosibirsk 630090, Russian Federation  P.N. Lebedev Physical Institute
of the Russian Academy of Sciences, Moscow 119991, Russian Federation
Novosibirsk State University, Novosibirsk 630090, Russian Federation  A.
Vossen  Duke University, Durham, North Carolina 27708, U.S.A.  E. Waheed  High
Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan  H. M.
Wakeling  McGill University, Montréal, Québec, H3A 2T8, Canada  K. Wan
Department of Physics, University of Tokyo, Tokyo 113-0033, Japan  W. Wan
Abdullah  National Centre for Particle Physics, University Malaya, 50603 Kuala
Lumpur, Malaysia  B. Wang  Max-Planck-Institut für Physik, 80805 München,
Germany  C. H. Wang  National United University, Miao Li 36003, Taiwan  M.-Z.
Wang  Department of Physics, National Taiwan University, Taipei 10617, Taiwan
X. L. Wang  Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)
and Institute of Modern Physics, Fudan University, Shanghai 200443, China  A.
Warburton  McGill University, Montréal, Québec, H3A 2T8, Canada  M. Watanabe
Niigata University, Niigata 950-2181, Japan  S. Watanuki  Université Paris-
Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France  I. Watson  Department of
Physics, University of Tokyo, Tokyo 113-0033, Japan  J. Webb  School of
Physics, University of Melbourne, Victoria 3010, Australia  S. Wehle
Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany  M. Welsch
University of Bonn, 53115 Bonn, Germany  C. Wessel  University of Bonn, 53115
Bonn, Germany  J. Wiechczynski  INFN Sezione di Pisa, I-56127 Pisa, Italy  P.
Wieduwilt  II. Physikalisches Institut, Georg-August-Universität Göttingen,
37073 Göttingen, Germany  H. Windel  Max-Planck-Institut für Physik, 80805
München, Germany  E. Won  Korea University, Seoul 02841, South Korea  L. J. Wu
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049,
China  X. P. Xu  Soochow University, Suzhou 215006, China  B. Yabsley  School
of Physics, University of Sydney, New South Wales 2006, Australia  S. Yamada
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
W. Yan  University of Science and Technology of China, Hefei 230026, China  S.
B. Yang  Korea University, Seoul 02841, South Korea  H. Ye  Deutsches
Elektronen–Synchrotron, 22607 Hamburg, Germany  J. Yelton  University of
Florida, Gainesville, Florida 32611, U.S.A.  I. Yeo  Korea Institute of
Science and Technology Information, Daejeon 34141, South Korea  J. H. Yin
Korea University, Seoul 02841, South Korea  M. Yonenaga  Tokyo Metropolitan
University, Tokyo 192-0397, Japan  Y. M. Yook  Institute of High Energy
Physics, Chinese Academy of Sciences, Beijing 100049, China  T. Yoshinobu
Niigata University, Niigata 950-2181, Japan  C. Z. Yuan  Institute of High
Energy Physics, Chinese Academy of Sciences, Beijing 100049, China  G. Yuan
University of Science and Technology of China, Hefei 230026, China  W. Yuan
INFN Sezione di Padova, I-35131 Padova, Italy  Y. Yusa  Niigata University,
Niigata 950-2181, Japan  L. Zani  Centre de Physique des Particules de
Marseille, 13288 Marseille, France  J. Z. Zhang  Institute of High Energy
Physics, Chinese Academy of Sciences, Beijing 100049, China  Y. Zhang
University of Science and Technology of China, Hefei 230026, China  Z. Zhang
University of Science and Technology of China, Hefei 230026, China  V. Zhilich
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian
Federation  Novosibirsk State University, Novosibirsk 630090, Russian
Federation  Q. D. Zhou  Graduate School of Science, Nagoya University, Nagoya
464-8602, Japan  X. Y. Zhou  Beihang University, Beijing 100191, China  V. I.
Zhukova  P.N. Lebedev Physical Institute of the Russian Academy of Sciences,
Moscow 119991, Russian Federation  V. Zhulanov  Budker Institute of Nuclear
Physics SB RAS, Novosibirsk 630090, Russian Federation  Novosibirsk State
University, Novosibirsk 630090, Russian Federation  A. Zupanc  J. Stefan
Institute, 1000 Ljubljana, Slovenia

###### Abstract

We report on the reconstruction of various charmless $B$ decays from electron-
positron collisions at the energy corresponding to the $\mathchar
28935\relax(4S)$ resonance collected with the Belle II detector at the
SuperKEKB collider. We use simulation to devise optimized event selections and
apply them to the full data set collected in 2019, corresponding to 8.7 fb-1
of integrated luminosity. We fit the difference between half of the collision
energy and the $B$ candidate energy (in the $\mathchar 28935\relax(4S)$ frame)
for events restricted to a signal-rich range in beam-energy-constrained mass
to search for charmless signals. Signal yields of approximately 80, 15, 20,
30, 90, and 160 decays are reconstructed for the channels $B^{0}\rightarrow
K^{+}\pi^{-}$, $B^{0}\rightarrow\pi^{+}\pi^{-}$, $B^{+}\rightarrow
K^{0}_{S}(\rightarrow\pi^{+}\pi^{-})\pi^{+}$, $B^{+}\rightarrow
K^{+}\pi^{0}(\rightarrow\gamma\gamma)$, $B^{+}\rightarrow K^{+}K^{-}K^{+}$,
and $B^{+}\rightarrow K^{+}\pi^{-}\pi^{+}$, respectively. Yields and
background contaminations are compatible with those expected from simulation
and comparable with those obtained by the Belle experiment. The results show a
good understanding of the detector performance and offer a reliable basis to
assess projections for future reach.

Belle II, charmless, phase 3

##  1 Introduction and motivation

The study of charmless $B$ decays is a keystone of the Belle II physics
program, which offers the unique capability of studying jointly, within a
consistent experimental environment, all relevant two-, three-, and multi-body
final states. This ability can enable significant advances, including an
improved determination of the quark-mixing-matrix angle $\phi_{2}/\alpha$, a
conclusive understanding of long-standing anomalies like the so-called $K\pi$
puzzle, and a thorough investigation of charge-parity-violating asymmetries
localized in the phase space of three-body $B$ decays. Ultimately, the Belle
II charmless program is expected to offer a sharper picture of the weak
interactions of quarks that could reveal possible deviations from the standard
model Kou:2018nap .

The Belle II detector, complete with its vertex detector, started its 2019
collision operations on March 11 and continued until December 13. The
collected sample of electron-positron collisions corresponds to an integrated
luminosity of 8.7 fb-1 at the $\mathchar 28935\relax(4{\rm S})$ resonance and
0.827 fb-1 at an energy about 60 MeV smaller. This document describes the
reconstruction of charmless signals in addition to the 25 $B^{0}\rightarrow
K^{+}\pi^{-}$ decays reconstructed in Fall 2019 using half of the current data
set Benedikt:2019 .

We focus on two- and three-body charmless decays with branching fractions of
$10^{-6}$, or larger, into final states sufficiently simple to obtain visible
signals in the current data set with a relatively straightforward
reconstruction. The target decay modes are $B^{0}\rightarrow K^{+}\pi^{-}$,
$B^{0}\rightarrow\pi^{+}\pi^{-}$, $B^{+}\rightarrow
K^{0}_{S}(\rightarrow\pi^{+}\pi^{-})\pi^{+}$, $B^{+}\rightarrow
K^{+}\pi^{0}(\rightarrow\gamma\gamma)$, $B^{+}\rightarrow K^{+}K^{-}K^{+}$,
and $B^{+}\rightarrow K^{+}\pi^{-}\pi^{+}$. Charge-conjugate processes are
implied in what follows.

The reconstruction strategy and procedures are developed and finalized in
simulated data prior to applying it to the experimental data. Experimental and
simulated data are then compared in terms of signal yields, backgrounds, and
relevant resolutions. Most of the analysis is conducted using the following
variables, which are known to be strongly discriminating between $B$ signal
and background from $e^{+}e^{-}\rightarrow q\bar{q}$ continuum events, where
$q$ indicates any quark of the first or second family:

  * •

the energy difference $\Delta E\equiv\sqrt{s}/2-E^{*}_{B}$ between half of the
collision energy and the total energy of the reconstructed $B$ candidate, both
in the $\mathchar 28935\relax(4S)$ frame;

  * •

the beam-energy-constrained mass $M_{\rm
bc}\equiv\sqrt{s/(4c^{4})-(p^{*}_{B}/c)^{2}}$, which is the invariant mass of
the $B$ candidate where the $B$ energy is replaced by the (more precisely
known) half of the collision energy.

##  2 The Belle II detector

Belle II is a particle-physics detector Kou:2018nap ; Abe:2010sj , designed to
reconstruct the products of electron-positron collisions produced by the
SuperKEKB asymmetric-energy collider Akai:2018mbz , located at the KEK
laboratory in Tsukuba, Japan. Belle II comprises several subdetectors arranged
around the interaction space-point in a cylindrical geometry. The innermost
subdetector is the vertex detector, which uses position-sensitive silicon
layers to sample the trajectories of charged particles (tracks) in the
vicinity of the interaction region to extrapolate the decay positions of their
long-lived parent particles. The vertex detector includes two inner layers of
silicon pixel sensors and four outer layers of silicon microstrip sensors. The
second pixel layer is currently incomplete and covers only a small portion of
azimuthal angle. Charged-particle momenta and charges are measured by a large-
radius, helium-ethane, small-cell central drift chamber, which also offers
charged-particle-identification information through a measurement of
particles’ energy-loss by specific ionization. A Cherenkov-light angle and
time-of-propagation detector sourrounding the chamber provides charged-
particle identification in the central detector volume, supplemented by
proximity-focusing, aerogel, ring-imaging Cherenkov detectors in the forward
regions. A CsI(Tl)-crystal electromagnetic calorimeter allows for energy
measurements of electrons and photons. A solenoid surrounding the calorimeter
generates a uniform axial 1.5 T magnetic field filling its inner volume.
Layers of plastic scintillator and resistive-plate chambers, interspersed
between the magnetic flux-return iron plates, allow for identification of
$K^{0}_{\rm L}$ and muons. The subdetectors most relevant for this work are
the silicon vertex detector, the tracking drift chamber, the particle-
identification detectors, and the electromagnetic calorimeter.

##  3 Selection and reconstruction

We reconstruct the following two-body decays:

  * •

$B^{0}\rightarrow K^{+}\,\pi^{-}$,

  * •

$B^{0}\rightarrow\pi^{+}\,\pi^{-}$,

  * •

$B^{+}\rightarrow K_{\rm S}^{0}(\rightarrow\pi^{+}\pi^{-})\,\pi^{+}$,

  * •

$B^{+}\rightarrow K^{+}\,\pi^{0}(\rightarrow\gamma\gamma)$,

and three-body decays:

  * •

$B^{+}\rightarrow K^{+}\,K^{-}\,K^{+}$,

  * •

$B^{+}\rightarrow K^{+}\,\pi^{+}\,\pi^{-}$.

In addition, we use the control channel
$B^{+}\rightarrow\overline{D}^{0}(\rightarrow K^{+}\pi^{-}\pi^{0})\,\pi^{+}$
for validation of continuum-suppression discriminating variables and
optimization of the $\pi^{0}$ selection.

###  3.1 Data

We use generic simulated data to optimize the event selection and compare the
final $\Delta E$ distributions observed in experimental data with
expectations. We use signal-only simulated data to model relevant signal
features for fits. Generic simulation consists of Monte Carlo samples that
include $B^{0}{\kern-1.60004pt\kern
1.79993pt\overline{\kern-1.79993ptB}{}^{0}}$, $B^{+}{\kern-1.60004ptB^{-}}$,
$u\overline{u}$, $d\overline{d}$, $c\overline{c}$, and $s\overline{s}$
processes in realistic proportions and correspond to an integrated luminosity
of 50 fb-1, about six times the $\mathchar 28935\relax$(4S) data. In addition,
$2\times 10^{6}$ signal-only events are generated for each channel Ryd:2005zz
. Three-body decays are generated assuming phase-space distributions.

As for experimental data, we use all 2019 $\mathchar 28935\relax$(4S) good-
quality runs, corresponding to an integrated luminosity of 8.7 fb-1. All
events are required to meet mild data-skim selection criteria, based on total
energy and charged-particle multiplicity in the event, targeted at reducing
sample sizes to a manageable level. All data are processed using the Belle II
analysis software framework Kuhr:2018lps .

###  3.2 Reconstruction and baseline selection

We form final-state particle candidates by applying loose baseline selection
criteria and then combine them in kinematic fits consistent with the
topologies of the desired decays to reconstruct intermediate states and $B$
candidates.

We reconstruct charged pion and kaon candidates by starting from the most
inclusive charged-particle classes and by requiring fiducial criteria that
restrict them to the full acceptance in the central drift chamber and to loose
ranges in impact parameter to reduce beam-background-induced tracks, which do
not originate from the interaction region preferably. We reconstruct neutral
pion candidates by requiring photons to exceed energies of about $20$ MeV,
restricting the diphoton mass, and excluding extreme helicity-angle values to
suppress combinatorial background from collinear soft photons. The mass of the
$\pi^{0}$ candidates is constrained to its known value in subsequent kinematic
fits. For $K_{\rm S}^{0}$ reconstruction, we use pairs of opposite-charge red
particles that originate from a common space-point and have dipion mass
consistent with a $K_{\rm S}^{0}$. The resulting $K^{\pm}$, $\pi^{\pm}$,
$\pi^{0}$, and
$\mathit{{\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}^{0}_{\rm
S}$ candidates are combined through kinematic fits into each of our target
signal channels, consistent with the desired topology. Because we use flavor-
tagging information as input to the continuum-background discriminator, we
reconstruct the vertex of the accompanying tag-side $B$ mesons using all
tracks in the tag-side and identify the flavor using a category-based flavor
tagger Abudinen:2018 . The reconstruction of the control channel is
conceptually similar, except for the requirement
$1.84<m(K^{-}\pi^{+}\pi^{0})<1.89$ GeV/$c^{2}$ on the $K^{-}\pi^{+}\pi^{0}$
mass to be consistent with the known $D^{0}$ meson mass.

Simulation is used to identify and suppress contamination from peaking
backgrounds, that is, misreconstructed events clustering in the signal region
$M_{\rm bc}>5.27$ GeV/$c^{2}$ and $-0.15<\Delta E<0.15$ GeV. Relevant peaking
backgrounds affect only the $B^{+}\rightarrow K^{+}\pi^{-}\pi^{+}$ channel.
Background from $B^{+}\rightarrow\overline{D}^{0}(\rightarrow
K^{+}\pi^{-})\pi^{+}$ decays is suppressed by vetoing candidates with kaon-
pion mass $1.84<m(K^{+}\pi^{-})<1.89$ GeV/$c^{2}$. The contribution from
$B^{+}\rightarrow J/\psi(\rightarrow\mu^{+}\mu^{-})K^{+}$ decays where muons
are misidentified as pions is suppressed by vetoing candidates with dipion
mass $3.05<m(\pi^{+}\pi^{-})<3.15$ GeV/$c^{2}$.

###  3.3 Continuum suppression

The main challenge in reconstructing significant charmless signals is the
large contamination from continuum background. To discriminate against such
background, we use a binary boosted decision-tree classifier that combines
nonlinearly a number of variables known to provide statistical discrimination
between $B$-meson signals and continuum. We choose 39 variables whose
correlation with $\Delta E$ and $M_{\it bc}$ is below $\pm$5% to avoid biases
in signal-yield determination. These variables include quantities associated
to event topology (global and signal-only angular configurations), flavor-
tagger information, vertex separation and uncertainty information, and
kinematic-fit quality information. Data-simulation comparison for input
distributions using the control sample shows no major inconsistency for both
signal and background. We train the classifier to identify statistically
significant signal and background features using unbiased simulated samples.

##  4 Optimization of the signal selection

For each channel, we optimize the selection to isolate abundant, low-
background signals using simulated and control-sample data. We vary the
selection criteria on continuum-suppression output, charged-particle
identification information, and choice of $\pi^{0}$ (when appropriate) to
maximize ${\rm S}/\sqrt{{\rm S}+{\rm B}}$, where ${\rm S}$ and ${\rm B}$ are
signal and background yields, respectively, estimated in the $\Delta E$ signal
region. Continuum-suppression and particle-identification requirements are
optimized simultaneously using simulated data. The $\pi^{0}$ selection is
optimized independently by using control
$B^{+}\rightarrow\overline{D}^{0}(\rightarrow K^{+}\pi^{-}\pi^{0})\pi^{-}$
decays in which S is the $B^{+}\rightarrow\overline{D}^{0}(\rightarrow
K^{+}\pi^{-}\pi^{0})\pi^{-}$ signal yield, scaled to the expected
$B^{+}\rightarrow K^{+}\pi^{0}$ yield, and B is the background observed in an
$M_{\rm bc}$ sideband of $B^{+}\rightarrow K^{+}\pi^{0}$.

##  5 Determination of signal yields

More than one candidate per event populates the resulting $\Delta E$
distributions, with average multiplicities ranging from 1.00 to 1.25. We
restrict to one candidate per event as follows. For channels with $\pi^{0}$,
we first select the $\pi^{0}$ candidate with the highest $p$-value of the
mass-constrained diphoton fit. If more than one candidate remains, and for all
other channels, we select a single $B$ candidate randomly.

Signal yields are determined with maximum likelihood fits of the unbinned
$\Delta E$ distributions of candidates restricted to the signal region in
$M_{\rm bc}$. Fit models are generally determined empirically by using
simulation, with the only additional flexibility of a global shift of peak
positions when suggested by likelihood-ratio tests.

##  6 Results

Figures 1–6 show the resulting $\Delta E$ distributions, with fit results
overlaid. Prominent narrow signals of 10–150 events are visible overlapping
smooth backgrounds dominated by continuum. The $B^{0}\rightarrow K^{+}\pi^{0}$
signal shows a low-$\Delta E$ tail, due to resolution effects in $\pi^{0}$
reconstruction. Satellite signals from kinematically similar misreconstructed
decays are visible in the $B^{0}\rightarrow K^{+}\pi^{-}$,
$B^{0}\rightarrow\pi^{+}\pi^{-}$, and $B^{+}\rightarrow K^{+}\pi^{-}\pi^{-}$
decays.

Figure 1: Distributions of $\Delta E$ for $B^{0}\rightarrow K^{+}\pi^{-}$
candidates reconstructed in (left) simulated data and (right) 2019 Belle II
data selected through the baseline criteria plus an optimized continuum-
suppression and kaon-enriching selection, and further restricted to $M_{\rm
bc}>5.27$ GeV/$c^{2}$. A misreconstructed $\pi^{+}\pi^{-}$ component is
included with shape equal to the $K^{+}\pi^{-}$ shape and distance from the
$K^{+}\pi^{-}$ peak fixed to the known value. The global position of the two
peaks is determined by the fit. The projection of an unbinned maximum
likelihood fit is overlaid.

Figure 2: Distributions of $\Delta E$ for $B^{0}\rightarrow\pi^{+}\pi^{-}$
candidates reconstructed in (left) simulated data and (right) 2019 Belle II
data, selected through the baseline criteria plus an optimized continuum-
suppression and pion-enriching selection, and further restricted to $M_{\rm
bc}>5.27$ GeV/$c^{2}$. A misreconstructed $K^{+}\pi^{-}$ component is included
with shape equal to the $\pi^{+}\pi^{-}$ shape and distance from the
$\pi^{+}\pi^{-}$ peak fixed to the known value. The global position of the two
peaks is determined by the fit. The projection of an unbinned maximum
likelihood fit is overlaid.

Figure 3: Distributions of $\Delta E$ for
$B^{+}\rightarrow\mathit{{\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}^{0}_{\rm
S}\pi^{+}$ candidates reconstructed in (left) simulated data and (right) 2019
Belle II data, selected through the baseline criteria plus an optimized
continuum-suppression, and further restricted to $M_{\rm bc}>5.27$
GeV/$c^{2}$. The projection of an unbinned maximum likelihood fit is overlaid.

Figure 4: Distributions of $\Delta E$ for $B^{+}\rightarrow K^{+}\pi^{0}$
candidates reconstructed in (left) simulated data and (right) 2019 Belle II
data, selected through the baseline criteria plus an optimized continuum-
suppression, kaon- and $\pi^{0}$-enriching selection, further restricted to
$M_{\rm bc}>5.27$ GeV/$c^{2}$. The projection of an unbinned maximum
likelihood fit is overlaid.

Figure 5: Distributions of $\Delta E$ for $B^{+}\rightarrow K^{+}K^{-}K^{+}$
candidates reconstructed in (left) simulated data and (right) 2019 Belle II
data, selected through the baseline criteria plus an optimized continuum-
suppression and kaon-enriching selection, further restricted to $M_{\rm
bc}>5.27$ GeV/$c^{2}$. The projection of an unbinned maximum likelihood fit is
overlaid.

Figure 6: Distributions of $\Delta E$ for $B^{+}\rightarrow K^{+}\pi^{-}\pi^{+}$ candidates reconstructed in (left) simulated data and (right) 2019 Belle II data, selected through the baseline criteria plus an optimized continuum-suppression and kaon-enriching selection, further restricted to $M_{\rm bc}>5.27$ GeV/$c^{2}$. Vetoes for peaking backgrounds are applied. Misreconstructed $K^{+}K^{-}\pi^{+}$ and $\pi^{+}\pi^{-}\pi^{+}$ components are included with shape equal to the $K^{+}\pi^{-}\pi^{+}$ shape and distances from the $K^{+}\pi^{-}\pi^{+}$ peak fixed to the known values. The global position of the three peaks is determined by the fit. The projection of an unbinned maximum likelihood fit is overlaid. | Yield | Yield/$\mathrm{f}\mathrm{b}^{-1}$
---|---|---
Decay | MC | Data | MC | Data
$\mathit{{\mathit{{B}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}^{0}\rightarrow\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\mathit{{\pi}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{-}}}$ | $371\pm 24$ | $79\pm 11$ | $7.4\pm 0.5$ | $9.1\pm 1.3$
$\mathit{{\mathit{{B}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}^{0}\rightarrow\mathit{{\pi}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\mathit{{\pi}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{-}}}$ | $78\pm 11$ | $16\pm 5\enskip$ | $1.6\pm 0.2$ | $1.8\pm 0.6$
$\mathit{{B}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\rightarrow\mathit{{\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}^{0}_{\rm S}\mathit{{\pi}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}$ | $83\pm 10$ | $18\pm 5\enskip$ | $1.7\pm 0.2$ | $2.1\pm 0.6$
$\mathit{{B}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\rightarrow\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\mathit{{\mathit{{\pi}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}^{0}$ | $191\pm 20$ | $27\pm 8\enskip$ | $3.8\pm 0.4$ | $3.1\pm 0.9$
$\mathit{{B}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\rightarrow\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{-}}}$ | $559\pm 28$ | $92\pm 12$ | $11.2\pm 0.6$ | $10.6\pm 1.4$
$\mathit{{B}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\rightarrow\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\mathit{{\pi}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{+}}}\mathit{{\pi}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{-}}}$ | $1008\pm 44$ | $160\pm 19$ | $20.2\pm 0.9$ | $18.4\pm 2.2$
Table 1: Summary of charmless yields, and yields per integrated luminosity, in
2019 Belle II data. The size of the simulated (experimental) sample
corresponds to an integrated luminosity of 50 (8.7) fb-1. Only the statistical
contributions to the uncertainties are reported.

##  7 Comparison with Belle

Comparison of the current two-body results with Belle’s latest results on the
same channels, based on the full sample corresponding to 712 fb-1 Duh:2012ie ,
provides interesting insight to assess Belle II’s current and projected
performance. A consistent comparison would require redoing the full analysis
of Belle data to account for the differences in the statistical content of the
variables and in analysis strategy. We offer a simplified comparison based on
signal yields and peak purities (i.e., S/B at peak), shown in Table 2. The
current Belle II performance in charmless $B$ decay reconstruction is
comparable to the Belle performance.

Decay | Belle II yield/fb-1 | Belle II purity | Belle yield/fb-1 | Belle purity
---|---|---|---|---
$B^{0}\rightarrow K^{+}\pi^{-}$ | 9.1 $\pm$ 1.3 | $\approx 10$ | 10.6 $\pm$ 0.18 | $\approx 5$
$B^{0}\rightarrow\pi^{+}\pi^{-}$ | 1.8 $\pm$ 0.6 | $\approx 5.5$ | 2.96 $\pm$ 0.12 | $\approx 2.4$
$B^{+}\rightarrow K^{+}\pi^{0}$ | 3.1 $\pm$ 0.9 | $\approx 3.6$ | 5.2 $\pm$ 0.13 | $\approx 3.5$
$B^{+}\rightarrow\mathit{{\mathit{{K}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}}{}_{\mspace{-3.0mu}\scriptstyle{}}^{\mspace{-1.0mu}\scriptstyle{}}}^{0}_{\rm S}\pi^{+}$ | 2.1 $\pm$ 0.6 | $\approx 10$ | 4.5 $\pm$ 0.1 | $\approx 12$
Table 2: Comparison between Belle Duh:2012ie and Belle II (this work)
performance in signal yield and peak purity. Only the statistical
contributions to the uncertainties are reported.

##  8 Summary

We report on the reconstruction of various $B$ charmless signals in 2019 Belle
II data. We devise optimized event selections using simulation and apply them
to the full data set collected in 2019, corresponding to 8.7 fb-1 of
integrated luminosity. The $\Delta E$ distributions of the resulting samples,
restricted in $M_{\rm bc}$, are fit to search for charmless signals. Signal
yields of approximately 80, 15, 20, 30, 90, and 160 decays are reconstructed
for the channels $B^{0}\rightarrow K^{+}\pi^{-}$,
$B^{0}\rightarrow\pi^{+}\pi^{-}$, $B^{+}\rightarrow
K^{0}_{S}(\rightarrow\pi^{+}\pi^{-})\pi^{+}$, $B^{+}\rightarrow
K^{+}\pi^{0}(\rightarrow\gamma\gamma)$, $B^{+}\rightarrow K^{+}K^{-}K^{+}$,
and $B^{+}\rightarrow K^{+}\pi^{-}\pi^{+}$, respectively, totaling nearly 400
charmless $B$ decays (Fig. 7). Yields are generally compatible with
expectations from simulation and have comparable backgrounds. This work
establishes a good understanding of detector performance. In addition, it
establishes solid ground to assess future projections for charmless physics
measurements, such as stringent tests of the isospin sum-rule Kou:2018nap ,
for which competitive results could be available with the sample collected a
year from now.

Figure 7: Stacked $\Delta E$ distributions of charmless channels reconstructed
in 2019 Belle II data with the sum of fit projections overlaid.

## Acknowledgments

We thank the SuperKEKB group for the excellent operation of the accelerator;
the KEK cryogenics group for the efficient operation of the solenoid; and the
KEK computer group for on-site computing support. This work was supported by
the following funding sources: Science Committee of the Republic of Armenia
Grant No. 18T-1C180; Australian Research Council and research grant Nos.
DP180102629, DP170102389, DP170102204, DP150103061, FT130100303, and
FT130100018; Austrian Federal Ministry of Education, Science and Research, and
Austrian Science Fund No. P 31361-N36; Natural Sciences and Engineering
Research Council of Canada, Compute Canada and CANARIE; Chinese Academy of
Sciences and research grant No. QYZDJ-SSW-SLH011, National Natural Science
Foundation of China and research grant Nos. 11521505, 11575017, 11675166,
11761141009, 11705209, and 11975076, LiaoNing Revitalization Talents Program
under contract No. XLYC1807135, Shanghai Municipal Science and Technology
Committee under contract No. 19ZR1403000, Shanghai Pujiang Program under Grant
No. 18PJ1401000, and the CAS Center for Excellence in Particle Physics
(CCEPP); the Ministry of Education, Youth and Sports of the Czech Republic
under Contract No. LTT17020 and Charles University grants SVV 260448 and GAUK
404316; European Research Council, 7th Framework PIEF-GA-2013-622527, Horizon
2020 Marie Sklodowska-Curie grant agreement No. 700525 ‘NIOBE,’ and Horizon
2020 Marie Sklodowska-Curie RISE project JENNIFER2 grant agreement No. 822070
(European grants); L’Institut National de Physique Nucléaire et de Physique
des Particules (IN2P3) du CNRS (France); BMBF, DFG, HGF, MPG and AvH
Foundation (Germany); Department of Atomic Energy and Department of Science
and Technology (India); Israel Science Foundation grant No. 2476/17 and United
States-Israel Binational Science Foundation grant No. 2016113; Istituto
Nazionale di Fisica Nucleare and the research grants BELLE2; Japan Society for
the Promotion of Science, Grant-in-Aid for Scientific Research grant Nos.
16H03968, 16H03993, 16H06492, 16K05323, 17H01133, 17H05405, 18K03621,
18H03710, 18H05226, 19H00682, 26220706, and 26400255, the National Institute
of Informatics, and Science Information NETwork 5 (SINET5), and the Ministry
of Education, Culture, Sports, Science, and Technology (MEXT) of Japan;
National Research Foundation (NRF) of Korea Grant Nos. 2016R1D1A1B01010135,
2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970,
2018R1D1A1B07047294, 2019K1A3A7A09033840, and 2019R1I1A3A01058933, Radiation
Science Research Institute, Foreign Large-size Research Facility Application
Supporting project, the Global Science Experimental Data Hub Center of the
Korea Institute of Science and Technology Information and KREONET/GLORIAD;
Universiti Malaya RU grant, Akademi Sains Malaysia and Ministry of Education
Malaysia; Frontiers of Science Program contracts FOINS-296, CB-221329,
CB-236394, CB-254409, and CB-180023, and the Thematic Networks program
(Mexico); the Polish Ministry of Science and Higher Education and the National
Science Center; the Ministry of Science and Higher Education of the Russian
Federation, Agreement 14.W03.31.0026; University of Tabuk research grants
S-1440-0321, S-0256-1438, and S-0280-1439 (Saudi Arabia); Slovenian Research
Agency and research grant Nos. J1-9124 and P1-0135; Agencia Estatal de
Investigacion, Spain grant Nos. FPA2014-55613-P and FPA2017-84445-P, and
CIDEGENT/2018/020 of Generalitat Valenciana; Ministry of Science and
Technology and research grant Nos. MOST106-2112-M-002-005-MY3 and
MOST107-2119-M-002-035-MY3, and the Ministry of Education (Taiwan); Thailand
Center of Excellence in Physics; TUBITAK ULAKBIM (Turkey); Ministry of
Education and Science of Ukraine; the US National Science Foundation and
research grant Nos. PHY-1807007 and PHY-1913789, and the US Department of
Energy and research grant Nos. DE-AC06-76RLO1830, DE-SC0007983, DE-SC0009824,
DE-SC0009973, DE-SC0010073, DE-SC0010118, DE-SC0010504, DE-SC0011784, DE-
SC0012704; and the National Foundation for Science and Technology Development
(NAFOSTED) of Vietnam under contract No 103.99-2018.45.

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