CDF Collaboration222With visitors from aUniversity of British Columbia,
Vancouver, BC V6T 1Z1, Canada, bIstituto Nazionale di Fisica Nucleare, Sezione
di Cagliari, 09042 Monserrato (Cagliari), Italy, cUniversity of California
Irvine, Irvine, CA 92697, USA, eInstitute of Physics, Academy of Sciences of
the Czech Republic, 182 21, Czech Republic, fCERN, CH-1211 Geneva,
Switzerland, gCornell University, Ithaca, NY 14853, USA, ddThe University of
Jordan, Amman 11942, Jordan, hUniversity of Cyprus, Nicosia CY-1678, Cyprus,
iOffice of Science, U.S. Department of Energy, Washington, DC 20585, USA,
jUniversity College Dublin, Dublin 4, Ireland, kETH, 8092 Zürich, Switzerland,
lUniversity of Fukui, Fukui City, Fukui Prefecture, Japan 910-0017,
mUniversidad Iberoamericana, Lomas de Santa Fe, México, C.P. 01219, Distrito
Federal, nUniversity of Iowa, Iowa City, IA 52242, USA, oKinki University,
Higashi-Osaka City, Japan 577-8502, pKansas State University, Manhattan, KS
66506, USA, qBrookhaven National Laboratory, Upton, NY 11973, USA, rUniversity
of Manchester, Manchester M13 9PL, United Kingdom, sQueen Mary, University of
London, London, E1 4NS, United Kingdom, tUniversity of Melbourne, Victoria
3010, Australia, uMuons, Inc., Batavia, IL 60510, USA, vNagasaki Institute of
Applied Science, Nagasaki 851-0193, Japan, wNational Research Nuclear
University, Moscow 115409, Russia, xNorthwestern University, Evanston, IL
60208, USA, yUniversity of Notre Dame, Notre Dame, IN 46556, USA, zUniversidad
de Oviedo, E-33007 Oviedo, Spain, aaCNRS-IN2P3, Paris, F-75205 France,
ccUniversidad Tecnica Federico Santa Maria, 110v Valparaiso, Chile,
llUniversite catholique de Louvain, 1348 Louvain-La-Neuve, Belgium,
ooUniversity of Zürich, 8006 Zürich, Switzerland, ppMassachusetts General
Hospital and Harvard Medical School, Boston, MA 02114 USA, qqHampton
University, Hampton, VA 23668, USA, rrLos Alamos National Laboratory, Los
Alamos, NM 87544, USA

#  Measurement of the top-quark pair production cross-section in events with
two leptons and bottom-quark jets using the full CDF data set

T. Aaltonen  Division of High Energy Physics, Department of Physics,
University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki,
Finland  S. Amerio  Istituto Nazionale di Fisica Nucleare, Sezione di Padova-
Trento, ffUniversity of Padova, I-35131 Padova, Italy  D. Amidei  University
of Michigan, Ann Arbor, Michigan 48109, USA  A. Anastassovx Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  A. Annovi  Laboratori
Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044
Frascati, Italy  J. Antos  Comenius University, 842 48 Bratislava, Slovakia;
Institute of Experimental Physics, 040 01 Kosice, Slovakia  G. Apollinari
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  J.A.
Appel  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  T.
Arisawa  Waseda University, Tokyo 169, Japan  A. Artikov  Joint Institute for
Nuclear Research, RU-141980 Dubna, Russia  J. Asaadi  Mitchell Institute for
Fundamental Physics and Astronomy, Texas A&M University, College Station,
Texas 77843, USA  W. Ashmanskas  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  B. Auerbach  Argonne National Laboratory,
Argonne, Illinois 60439, USA  A. Aurisano  Mitchell Institute for Fundamental
Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
F. Azfar  University of Oxford, Oxford OX1 3RH, United Kingdom  W. Badgett
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  T. Bae
Center for High Energy Physics: Kyungpook National University, Daegu 702-701,
Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan
University, Suwon 440-746, Korea; Korea Institute of Science and Technology
Information, Daejeon 305-806, Korea; Chonnam National University, Gwangju
500-757, Korea; Chonbuk National University, Jeonju 561-756, Korea; Ewha
Womans University, Seoul, 120-750, Korea  A. Barbaro-Galtieri  Ernest Orlando
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA  V.E.
Barnes  Purdue University, West Lafayette, Indiana 47907, USA  B.A. Barnett
The Johns Hopkins University, Baltimore, Maryland 21218, USA  P. Barriahh
Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity
of Siena and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  P. Bartos  Comenius University, 842
48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice,
Slovakia  M. Bauceff Istituto Nazionale di Fisica Nucleare, Sezione di Padova-
Trento, ffUniversity of Padova, I-35131 Padova, Italy  F. Bedeschi  Istituto
Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena
and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  S. Behari  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  G. Bellettinigg Istituto
Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena
and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  J. Bellinger  University of
Wisconsin, Madison, Wisconsin 53706, USA  D. Benjamin  Duke University,
Durham, North Carolina 27708, USA  A. Beretvas  Fermi National Accelerator
Laboratory, Batavia, Illinois 60510, USA  A. Bhatti  The Rockefeller
University, New York, New York 10065, USA  K.R. Bland  Baylor University,
Waco, Texas 76798, USA  B. Blumenfeld  The Johns Hopkins University,
Baltimore, Maryland 21218, USA  A. Bocci  Duke University, Durham, North
Carolina 27708, USA  A. Bodek  University of Rochester, Rochester, New York
14627, USA  D. Bortoletto  Purdue University, West Lafayette, Indiana 47907,
USA  J. Boudreau  University of Pittsburgh, Pittsburgh, Pennsylvania 15260,
USA  A. Boveia  Enrico Fermi Institute, University of Chicago, Chicago,
Illinois 60637, USA  L. Brigliadoriee Istituto Nazionale di Fisica Nucleare
Bologna, eeUniversity of Bologna, I-40127 Bologna, Italy  C. Bromberg
Michigan State University, East Lansing, Michigan 48824, USA  E. Brucken
Division of High Energy Physics, Department of Physics, University of Helsinki
and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland  J. Budagov
Joint Institute for Nuclear Research, RU-141980 Dubna, Russia  H.S. Budd
University of Rochester, Rochester, New York 14627, USA  K. Burkett  Fermi
National Accelerator Laboratory, Batavia, Illinois 60510, USA  G. Busettoff
Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, ffUniversity
of Padova, I-35131 Padova, Italy  P. Bussey  Glasgow University, Glasgow G12
8QQ, United Kingdom  P. Buttigg Istituto Nazionale di Fisica Nucleare Pisa,
ggUniversity of Pisa, hhUniversity of Siena and iiScuola Normale Superiore,
I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia, I-27100 Pavia,
Italy  A. Buzatu  Glasgow University, Glasgow G12 8QQ, United Kingdom  A.
Calamba  Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA  S.
Camarda  Institut de Fisica d’Altes Energies, ICREA, Universitat Autonoma de
Barcelona, E-08193, Bellaterra (Barcelona), Spain  M. Campanelli  University
College London, London WC1E 6BT, United Kingdom  F. Canellioo Enrico Fermi
Institute, University of Chicago, Chicago, Illinois 60637, USA  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  B. Carls  University of
Illinois, Urbana, Illinois 61801, USA  D. Carlsmith  University of Wisconsin,
Madison, Wisconsin 53706, USA  R. Carosi  Istituto Nazionale di Fisica
Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and iiScuola
Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia,
I-27100 Pavia, Italy  S. Carrillom University of Florida, Gainesville, Florida
32611, USA  B. Casalk Instituto de Fisica de Cantabria, CSIC-University of
Cantabria, 39005 Santander, Spain  M. Casarsa  Istituto Nazionale di Fisica
Nucleare Trieste/Udine; nnUniversity of Trieste, I-34127 Trieste, Italy;
kkUniversity of Udine, I-33100 Udine, Italy  A. Castroee Istituto Nazionale di
Fisica Nucleare Bologna, eeUniversity of Bologna, I-40127 Bologna, Italy  P.
Catastini  Harvard University, Cambridge, Massachusetts 02138, USA  D. Cauz
Istituto Nazionale di Fisica Nucleare Trieste/Udine; nnUniversity of Trieste,
I-34127 Trieste, Italy; kkUniversity of Udine, I-33100 Udine, Italy  V.
Cavaliere  University of Illinois, Urbana, Illinois 61801, USA  M. Cavalli-
Sforza  Institut de Fisica d’Altes Energies, ICREA, Universitat Autonoma de
Barcelona, E-08193, Bellaterra (Barcelona), Spain  A. Cerrif Ernest Orlando
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA  L.
Cerritos University College London, London WC1E 6BT, United Kingdom  Y.C. Chen
Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
M. Chertok  University of California, Davis, Davis, California 95616, USA  G.
Chiarelli  Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa,
hhUniversity of Siena and iiScuola Normale Superiore, I-56127 Pisa, Italy,
mmINFN Pavia and University of Pavia, I-27100 Pavia, Italy  G. Chlachidze
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  K. Cho
Center for High Energy Physics: Kyungpook National University, Daegu 702-701,
Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan
University, Suwon 440-746, Korea; Korea Institute of Science and Technology
Information, Daejeon 305-806, Korea; Chonnam National University, Gwangju
500-757, Korea; Chonbuk National University, Jeonju 561-756, Korea; Ewha
Womans University, Seoul, 120-750, Korea  D. Chokheli  Joint Institute for
Nuclear Research, RU-141980 Dubna, Russia  M.A. Cioccihh Istituto Nazionale di
Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and iiScuola
Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia,
I-27100 Pavia, Italy  A. Clark  University of Geneva, CH-1211 Geneva 4,
Switzerland  C. Clarke  Wayne State University, Detroit, Michigan 48201, USA
M.E. Convery  Fermi National Accelerator Laboratory, Batavia, Illinois 60510,
USA  J. Conway  University of California, Davis, Davis, California 95616, USA
M. Corbo  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
M. Cordelli  Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica
Nucleare, I-00044 Frascati, Italy  C.A. Cox  University of California, Davis,
Davis, California 95616, USA  D.J. Cox  University of California, Davis,
Davis, California 95616, USA  M. Cremonesi  Istituto Nazionale di Fisica
Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and iiScuola
Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia,
I-27100 Pavia, Italy  D. Cruz  Mitchell Institute for Fundamental Physics and
Astronomy, Texas A&M University, College Station, Texas 77843, USA  J. Cuevasz
Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005
Santander, Spain  R. Culbertson  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  N. d’Ascenzow Fermi National Accelerator
Laboratory, Batavia, Illinois 60510, USA  M. Dattaqq Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  P. De Barbaro
University of Rochester, Rochester, New York 14627, USA  L. Demortier  The
Rockefeller University, New York, New York 10065, USA  M. Deninno  Istituto
Nazionale di Fisica Nucleare Bologna, eeUniversity of Bologna, I-40127
Bologna, Italy  M. d’Erricoff Istituto Nazionale di Fisica Nucleare, Sezione
di Padova-Trento, ffUniversity of Padova, I-35131 Padova, Italy  F. Devoto
Division of High Energy Physics, Department of Physics, University of Helsinki
and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland  A. Di Cantogg
Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity
of Siena and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  B. Di Ruzzaq Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  J.R. Dittmann  Baylor
University, Waco, Texas 76798, USA  M. D’Onofrio  University of Liverpool,
Liverpool L69 7ZE, United Kingdom  S. Donatigg Istituto Nazionale di Fisica
Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and iiScuola
Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia,
I-27100 Pavia, Italy  M. Dorigonn Istituto Nazionale di Fisica Nucleare
Trieste/Udine; nnUniversity of Trieste, I-34127 Trieste, Italy; kkUniversity
of Udine, I-33100 Udine, Italy  A. Driutti  Istituto Nazionale di Fisica
Nucleare Trieste/Udine; nnUniversity of Trieste, I-34127 Trieste, Italy;
kkUniversity of Udine, I-33100 Udine, Italy  K. Ebina  Waseda University,
Tokyo 169, Japan  R. Edgar  University of Michigan, Ann Arbor, Michigan 48109,
USA  A. Elagin  Mitchell Institute for Fundamental Physics and Astronomy,
Texas A&M University, College Station, Texas 77843, USA  R. Erbacher
University of California, Davis, Davis, California 95616, USA  S. Errede
University of Illinois, Urbana, Illinois 61801, USA  B. Esham  University of
Illinois, Urbana, Illinois 61801, USA  R. Eusebi  Mitchell Institute for
Fundamental Physics and Astronomy, Texas A&M University, College Station,
Texas 77843, USA  S. Farrington  University of Oxford, Oxford OX1 3RH, United
Kingdom  J.P. Fernández Ramos  Centro de Investigaciones Energeticas
Medioambientales y Tecnologicas, E-28040 Madrid, Spain  R. Field  University
of Florida, Gainesville, Florida 32611, USA  G. Flanaganu Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  R. Forrest  University
of California, Davis, Davis, California 95616, USA  M. Franklin  Harvard
University, Cambridge, Massachusetts 02138, USA  J.C. Freeman  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  H. Frisch  Enrico Fermi
Institute, University of Chicago, Chicago, Illinois 60637, USA  Y. Funakoshi
Waseda University, Tokyo 169, Japan  A.F. Garfinkel  Purdue University, West
Lafayette, Indiana 47907, USA  P. Garosihh Istituto Nazionale di Fisica
Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and iiScuola
Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia,
I-27100 Pavia, Italy  H. Gerberich  University of Illinois, Urbana, Illinois
61801, USA  E. Gerchtein  Fermi National Accelerator Laboratory, Batavia,
Illinois 60510, USA  S. Giagu  Istituto Nazionale di Fisica Nucleare, Sezione
di Roma 1, jjSapienza Università di Roma, I-00185 Roma, Italy  V.
Giakoumopoulou  University of Athens, 157 71 Athens, Greece  K. Gibson
University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA  C.M. Ginsburg
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  N.
Giokaris  University of Athens, 157 71 Athens, Greece  P. Giromini  Laboratori
Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044
Frascati, Italy  G. Giurgiu  The Johns Hopkins University, Baltimore, Maryland
21218, USA  V. Glagolev  Joint Institute for Nuclear Research, RU-141980
Dubna, Russia  D. Glenzinski  Fermi National Accelerator Laboratory, Batavia,
Illinois 60510, USA  M. Gold  University of New Mexico, Albuquerque, New
Mexico 87131, USA  D. Goldin  Mitchell Institute for Fundamental Physics and
Astronomy, Texas A&M University, College Station, Texas 77843, USA  A.
Golossanov  Fermi National Accelerator Laboratory, Batavia, Illinois 60510,
USA  G. Gomez  Instituto de Fisica de Cantabria, CSIC-University of Cantabria,
39005 Santander, Spain  G. Gomez-Ceballos  Massachusetts Institute of
Technology, Cambridge, Massachusetts 02139, USA  M. Goncharov  Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139, USA  O. González
López  Centro de Investigaciones Energeticas Medioambientales y Tecnologicas,
E-28040 Madrid, Spain  I. Gorelov  University of New Mexico, Albuquerque, New
Mexico 87131, USA  A.T. Goshaw  Duke University, Durham, North Carolina 27708,
USA  K. Goulianos  The Rockefeller University, New York, New York 10065, USA
E. Gramellini  Istituto Nazionale di Fisica Nucleare Bologna, eeUniversity of
Bologna, I-40127 Bologna, Italy  S. Grinstein  Institut de Fisica d’Altes
Energies, ICREA, Universitat Autonoma de Barcelona, E-08193, Bellaterra
(Barcelona), Spain  C. Grosso-Pilcher  Enrico Fermi Institute, University of
Chicago, Chicago, Illinois 60637, USA  R.C. Group52 Fermi National Accelerator
Laboratory, Batavia, Illinois 60510, USA  J. Guimaraes da Costa  Harvard
University, Cambridge, Massachusetts 02138, USA  S.R. Hahn  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  J.Y. Han  University of
Rochester, Rochester, New York 14627, USA  F. Happacher  Laboratori Nazionali
di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
K. Hara  University of Tsukuba, Tsukuba, Ibaraki 305, Japan  M. Hare  Tufts
University, Medford, Massachusetts 02155, USA  R.F. Harr  Wayne State
University, Detroit, Michigan 48201, USA  T. Harrington-Tabern Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  K. Hatakeyama  Baylor
University, Waco, Texas 76798, USA  C. Hays  University of Oxford, Oxford OX1
3RH, United Kingdom  J. Heinrich  University of Pennsylvania, Philadelphia,
Pennsylvania 19104, USA  M. Herndon  University of Wisconsin, Madison,
Wisconsin 53706, USA  A. Hocker  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  Z. Hong  Mitchell Institute for Fundamental
Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
W. Hopkinsg Fermi National Accelerator Laboratory, Batavia, Illinois 60510,
USA  S. Hou  Institute of Physics, Academia Sinica, Taipei, Taiwan 11529,
Republic of China  R.E. Hughes  The Ohio State University, Columbus, Ohio
43210, USA  U. Husemann  Yale University, New Haven, Connecticut 06520, USA
M. Husseindd Michigan State University, East Lansing, Michigan 48824, USA  J.
Huston  Michigan State University, East Lansing, Michigan 48824, USA  G.
Introzzimm Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa,
hhUniversity of Siena and iiScuola Normale Superiore, I-56127 Pisa, Italy,
mmINFN Pavia and University of Pavia, I-27100 Pavia, Italy  M. Iorijj Istituto
Nazionale di Fisica Nucleare, Sezione di Roma 1, jjSapienza Università di
Roma, I-00185 Roma, Italy  A. Ivanovp University of California, Davis, Davis,
California 95616, USA  E. James  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  D. Jang  Carnegie Mellon University, Pittsburgh,
Pennsylvania 15213, USA  B. Jayatilaka  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  E.J. Jeon  Center for High Energy Physics:
Kyungpook National University, Daegu 702-701, Korea; Seoul National
University, Seoul 151-742, Korea; Sungkyunkwan University, Suwon 440-746,
Korea; Korea Institute of Science and Technology Information, Daejeon 305-806,
Korea; Chonnam National University, Gwangju 500-757, Korea; Chonbuk National
University, Jeonju 561-756, Korea; Ewha Womans University, Seoul, 120-750,
Korea  S. Jindariani  Fermi National Accelerator Laboratory, Batavia, Illinois
60510, USA  M. Jones  Purdue University, West Lafayette, Indiana 47907, USA
K.K. Joo  Center for High Energy Physics: Kyungpook National University, Daegu
702-701, Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan
University, Suwon 440-746, Korea; Korea Institute of Science and Technology
Information, Daejeon 305-806, Korea; Chonnam National University, Gwangju
500-757, Korea; Chonbuk National University, Jeonju 561-756, Korea; Ewha
Womans University, Seoul, 120-750, Korea  S.Y. Jun  Carnegie Mellon
University, Pittsburgh, Pennsylvania 15213, USA  T.R. Junk  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  M. Kambeitz  Institut
für Experimentelle Kernphysik, Karlsruhe Institute of Technology, D-76131
Karlsruhe, Germany  T. Kamon25 Mitchell Institute for Fundamental Physics and
Astronomy, Texas A&M University, College Station, Texas 77843, USA  P.E.
Karchin  Wayne State University, Detroit, Michigan 48201, USA  A. Kasmi
Baylor University, Waco, Texas 76798, USA  Y. Katoo Osaka City University,
Osaka 588, Japan  W. Ketchumrr Enrico Fermi Institute, University of Chicago,
Chicago, Illinois 60637, USA  J. Keung  University of Pennsylvania,
Philadelphia, Pennsylvania 19104, USA  B. Kilminsteroo Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  D.H. Kim  Center for
High Energy Physics: Kyungpook National University, Daegu 702-701, Korea;
Seoul National University, Seoul 151-742, Korea; Sungkyunkwan University,
Suwon 440-746, Korea; Korea Institute of Science and Technology Information,
Daejeon 305-806, Korea; Chonnam National University, Gwangju 500-757, Korea;
Chonbuk National University, Jeonju 561-756, Korea; Ewha Womans University,
Seoul, 120-750, Korea  H.S. Kim  Center for High Energy Physics: Kyungpook
National University, Daegu 702-701, Korea; Seoul National University, Seoul
151-742, Korea; Sungkyunkwan University, Suwon 440-746, Korea; Korea Institute
of Science and Technology Information, Daejeon 305-806, Korea; Chonnam
National University, Gwangju 500-757, Korea; Chonbuk National University,
Jeonju 561-756, Korea; Ewha Womans University, Seoul, 120-750, Korea  J.E. Kim
Center for High Energy Physics: Kyungpook National University, Daegu 702-701,
Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan
University, Suwon 440-746, Korea; Korea Institute of Science and Technology
Information, Daejeon 305-806, Korea; Chonnam National University, Gwangju
500-757, Korea; Chonbuk National University, Jeonju 561-756, Korea; Ewha
Womans University, Seoul, 120-750, Korea  M.J. Kim  Laboratori Nazionali di
Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy  S.B.
Kim  Center for High Energy Physics: Kyungpook National University, Daegu
702-701, Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan
University, Suwon 440-746, Korea; Korea Institute of Science and Technology
Information, Daejeon 305-806, Korea; Chonnam National University, Gwangju
500-757, Korea; Chonbuk National University, Jeonju 561-756, Korea; Ewha
Womans University, Seoul, 120-750, Korea  S.H. Kim  University of Tsukuba,
Tsukuba, Ibaraki 305, Japan  Y.J. Kim  Center for High Energy Physics:
Kyungpook National University, Daegu 702-701, Korea; Seoul National
University, Seoul 151-742, Korea; Sungkyunkwan University, Suwon 440-746,
Korea; Korea Institute of Science and Technology Information, Daejeon 305-806,
Korea; Chonnam National University, Gwangju 500-757, Korea; Chonbuk National
University, Jeonju 561-756, Korea; Ewha Womans University, Seoul, 120-750,
Korea  Y.K. Kim  Enrico Fermi Institute, University of Chicago, Chicago,
Illinois 60637, USA  N. Kimura  Waseda University, Tokyo 169, Japan  M. Kirby
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  K.
Knoepfel  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
K. Kondo111Deceased Waseda University, Tokyo 169, Japan  D.J. Kong  Center for
High Energy Physics: Kyungpook National University, Daegu 702-701, Korea;
Seoul National University, Seoul 151-742, Korea; Sungkyunkwan University,
Suwon 440-746, Korea; Korea Institute of Science and Technology Information,
Daejeon 305-806, Korea; Chonnam National University, Gwangju 500-757, Korea;
Chonbuk National University, Jeonju 561-756, Korea; Ewha Womans University,
Seoul, 120-750, Korea  J. Konigsberg  University of Florida, Gainesville,
Florida 32611, USA  A.V. Kotwal  Duke University, Durham, North Carolina
27708, USA  M. Kreps  Institut für Experimentelle Kernphysik, Karlsruhe
Institute of Technology, D-76131 Karlsruhe, Germany  J. Kroll  University of
Pennsylvania, Philadelphia, Pennsylvania 19104, USA  M. Kruse  Duke
University, Durham, North Carolina 27708, USA  T. Kuhr  Institut für
Experimentelle Kernphysik, Karlsruhe Institute of Technology, D-76131
Karlsruhe, Germany  M. Kurata  University of Tsukuba, Tsukuba, Ibaraki 305,
Japan  A.T. Laasanen  Purdue University, West Lafayette, Indiana 47907, USA
S. Lammel  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
M. Lancaster  University College London, London WC1E 6BT, United Kingdom  K.
Lannony The Ohio State University, Columbus, Ohio 43210, USA  G. Latinohh
Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity
of Siena and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  H.S. Lee  Center for High Energy
Physics: Kyungpook National University, Daegu 702-701, Korea; Seoul National
University, Seoul 151-742, Korea; Sungkyunkwan University, Suwon 440-746,
Korea; Korea Institute of Science and Technology Information, Daejeon 305-806,
Korea; Chonnam National University, Gwangju 500-757, Korea; Chonbuk National
University, Jeonju 561-756, Korea; Ewha Womans University, Seoul, 120-750,
Korea  J.S. Lee  Center for High Energy Physics: Kyungpook National
University, Daegu 702-701, Korea; Seoul National University, Seoul 151-742,
Korea; Sungkyunkwan University, Suwon 440-746, Korea; Korea Institute of
Science and Technology Information, Daejeon 305-806, Korea; Chonnam National
University, Gwangju 500-757, Korea; Chonbuk National University, Jeonju
561-756, Korea; Ewha Womans University, Seoul, 120-750, Korea  S. Leo
Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity
of Siena and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  S. Leone  Istituto Nazionale di
Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and iiScuola
Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia,
I-27100 Pavia, Italy  J.D. Lewis  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  A. Limosanit Duke University, Durham, North
Carolina 27708, USA  E. Lipeles  University of Pennsylvania, Philadelphia,
Pennsylvania 19104, USA  A. Listera University of Geneva, CH-1211 Geneva 4,
Switzerland  H. Liu  University of Virginia, Charlottesville, Virginia 22906,
USA  Q. Liu  Purdue University, West Lafayette, Indiana 47907, USA  T. Liu
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  S.
Lockwitz  Yale University, New Haven, Connecticut 06520, USA  A. Loginov  Yale
University, New Haven, Connecticut 06520, USA  A. Lucà  Laboratori Nazionali
di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
D. Lucchesiff Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento,
ffUniversity of Padova, I-35131 Padova, Italy  J. Lueck  Institut für
Experimentelle Kernphysik, Karlsruhe Institute of Technology, D-76131
Karlsruhe, Germany  P. Lujan  Ernest Orlando Lawrence Berkeley National
Laboratory, Berkeley, California 94720, USA  P. Lukens  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  G. Lungu  The
Rockefeller University, New York, New York 10065, USA  J. Lys  Ernest Orlando
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA  R.
Lysake Comenius University, 842 48 Bratislava, Slovakia; Institute of
Experimental Physics, 040 01 Kosice, Slovakia  R. Madrak  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  P. Maestrohh Istituto
Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena
and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  S. Malik  The Rockefeller
University, New York, New York 10065, USA  G. Mancab University of Liverpool,
Liverpool L69 7ZE, United Kingdom  A. Manousakis-Katsikakis  University of
Athens, 157 71 Athens, Greece  F. Margaroli  Istituto Nazionale di Fisica
Nucleare, Sezione di Roma 1, jjSapienza Università di Roma, I-00185 Roma,
Italy  P. Marinoii Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of
Pisa, hhUniversity of Siena and iiScuola Normale Superiore, I-56127 Pisa,
Italy, mmINFN Pavia and University of Pavia, I-27100 Pavia, Italy  M. Martínez
Institut de Fisica d’Altes Energies, ICREA, Universitat Autonoma de Barcelona,
E-08193, Bellaterra (Barcelona), Spain  K. Matera  University of Illinois,
Urbana, Illinois 61801, USA  M.E. Mattson  Wayne State University, Detroit,
Michigan 48201, USA  A. Mazzacane  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  P. Mazzanti  Istituto Nazionale di Fisica
Nucleare Bologna, eeUniversity of Bologna, I-40127 Bologna, Italy  R. McNultyj
University of Liverpool, Liverpool L69 7ZE, United Kingdom  A. Mehta
University of Liverpool, Liverpool L69 7ZE, United Kingdom  P. Mehtala
Division of High Energy Physics, Department of Physics, University of Helsinki
and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland  C. Mesropian
The Rockefeller University, New York, New York 10065, USA  T. Miao  Fermi
National Accelerator Laboratory, Batavia, Illinois 60510, USA  D. Mietlicki
University of Michigan, Ann Arbor, Michigan 48109, USA  A. Mitra  Institute of
Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China  H. Miyake
University of Tsukuba, Tsukuba, Ibaraki 305, Japan  S. Moed  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  N. Moggi  Istituto
Nazionale di Fisica Nucleare Bologna, eeUniversity of Bologna, I-40127
Bologna, Italy  C.S. Moonaa Fermi National Accelerator Laboratory, Batavia,
Illinois 60510, USA  R. Moorepp Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  M.J. Morelloii Istituto Nazionale di Fisica
Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and iiScuola
Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia,
I-27100 Pavia, Italy  A. Mukherjee  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  Th. Muller  Institut für Experimentelle
Kernphysik, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany  P.
Murat  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  M.
Mussiniee Istituto Nazionale di Fisica Nucleare Bologna, eeUniversity of
Bologna, I-40127 Bologna, Italy  J. Nachtmann Fermi National Accelerator
Laboratory, Batavia, Illinois 60510, USA  Y. Nagai  University of Tsukuba,
Tsukuba, Ibaraki 305, Japan  J. Naganoma  Waseda University, Tokyo 169, Japan
I. Nakano  Okayama University, Okayama 700-8530, Japan  A. Napier  Tufts
University, Medford, Massachusetts 02155, USA  J. Nett  Mitchell Institute for
Fundamental Physics and Astronomy, Texas A&M University, College Station,
Texas 77843, USA  C. Neu  University of Virginia, Charlottesville, Virginia
22906, USA  T. Nigmanov  University of Pittsburgh, Pittsburgh, Pennsylvania
15260, USA  L. Nodulman  Argonne National Laboratory, Argonne, Illinois 60439,
USA  S.Y. Noh  Center for High Energy Physics: Kyungpook National University,
Daegu 702-701, Korea; Seoul National University, Seoul 151-742, Korea;
Sungkyunkwan University, Suwon 440-746, Korea; Korea Institute of Science and
Technology Information, Daejeon 305-806, Korea; Chonnam National University,
Gwangju 500-757, Korea; Chonbuk National University, Jeonju 561-756, Korea;
Ewha Womans University, Seoul, 120-750, Korea  O. Norniella  University of
Illinois, Urbana, Illinois 61801, USA  L. Oakes  University of Oxford, Oxford
OX1 3RH, United Kingdom  S.H. Oh  Duke University, Durham, North Carolina
27708, USA  Y.D. Oh  Center for High Energy Physics: Kyungpook National
University, Daegu 702-701, Korea; Seoul National University, Seoul 151-742,
Korea; Sungkyunkwan University, Suwon 440-746, Korea; Korea Institute of
Science and Technology Information, Daejeon 305-806, Korea; Chonnam National
University, Gwangju 500-757, Korea; Chonbuk National University, Jeonju
561-756, Korea; Ewha Womans University, Seoul, 120-750, Korea  I. Oksuzian
University of Virginia, Charlottesville, Virginia 22906, USA  T. Okusawa
Osaka City University, Osaka 588, Japan  R. Orava  Division of High Energy
Physics, Department of Physics, University of Helsinki and Helsinki Institute
of Physics, FIN-00014, Helsinki, Finland  L. Ortolan  Institut de Fisica
d’Altes Energies, ICREA, Universitat Autonoma de Barcelona, E-08193,
Bellaterra (Barcelona), Spain  C. Pagliarone  Istituto Nazionale di Fisica
Nucleare Trieste/Udine; nnUniversity of Trieste, I-34127 Trieste, Italy;
kkUniversity of Udine, I-33100 Udine, Italy  E. Palenciaf Instituto de Fisica
de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain  P. Palni
University of New Mexico, Albuquerque, New Mexico 87131, USA  V. Papadimitriou
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  W. Parker
University of Wisconsin, Madison, Wisconsin 53706, USA  G. Paulettakk Istituto
Nazionale di Fisica Nucleare Trieste/Udine; nnUniversity of Trieste, I-34127
Trieste, Italy; kkUniversity of Udine, I-33100 Udine, Italy  M. Paulini
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA  C. Paus
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
T.J. Phillips  Duke University, Durham, North Carolina 27708, USA  G.
Piacentino  Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa,
hhUniversity of Siena and iiScuola Normale Superiore, I-56127 Pisa, Italy,
mmINFN Pavia and University of Pavia, I-27100 Pavia, Italy  E. Pianori
University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA  J. Pilot
The Ohio State University, Columbus, Ohio 43210, USA  K. Pitts  University of
Illinois, Urbana, Illinois 61801, USA  C. Plager  University of California,
Los Angeles, Los Angeles, California 90024, USA  L. Pondrom  University of
Wisconsin, Madison, Wisconsin 53706, USA  S. Poprockig Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  K. Potamianos  Ernest
Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
A. Pranko  Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley,
California 94720, USA  F. Prokoshincc Joint Institute for Nuclear Research,
RU-141980 Dubna, Russia  F. Ptohosh Laboratori Nazionali di Frascati, Istituto
Nazionale di Fisica Nucleare, I-00044 Frascati, Italy  G. Punzigg Istituto
Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena
and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  N. Ranjan  Purdue University, West
Lafayette, Indiana 47907, USA  I. Redondo Fernández  Centro de Investigaciones
Energeticas Medioambientales y Tecnologicas, E-28040 Madrid, Spain  P. Renton
University of Oxford, Oxford OX1 3RH, United Kingdom  M. Rescigno  Istituto
Nazionale di Fisica Nucleare, Sezione di Roma 1, jjSapienza Università di
Roma, I-00185 Roma, Italy  F. Rimondi∗ Istituto Nazionale di Fisica Nucleare
Bologna, eeUniversity of Bologna, I-40127 Bologna, Italy  L. Ristori42 Fermi
National Accelerator Laboratory, Batavia, Illinois 60510, USA  A. Robson
Glasgow University, Glasgow G12 8QQ, United Kingdom  T. Rodriguez  University
of Pennsylvania, Philadelphia, Pennsylvania 19104, USA  S. Rollii Tufts
University, Medford, Massachusetts 02155, USA  M. Ronzanigg Istituto Nazionale
di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and
iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University
of Pavia, I-27100 Pavia, Italy  R. Roser  Fermi National Accelerator
Laboratory, Batavia, Illinois 60510, USA  J.L. Rosner  Enrico Fermi Institute,
University of Chicago, Chicago, Illinois 60637, USA  F. Ruffinihh Istituto
Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena
and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  A. Ruiz  Instituto de Fisica de
Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain  J. Russ
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA  V. Rusu
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  W.K.
Sakumoto  University of Rochester, Rochester, New York 14627, USA  Y. Sakurai
Waseda University, Tokyo 169, Japan  L. Santikk Istituto Nazionale di Fisica
Nucleare Trieste/Udine; nnUniversity of Trieste, I-34127 Trieste, Italy;
kkUniversity of Udine, I-33100 Udine, Italy  K. Sato  University of Tsukuba,
Tsukuba, Ibaraki 305, Japan  V. Savelievw Fermi National Accelerator
Laboratory, Batavia, Illinois 60510, USA  A. Savoy-Navarroaa Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  P. Schlabach  Fermi
National Accelerator Laboratory, Batavia, Illinois 60510, USA  E.E. Schmidt
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  T.
Schwarz  University of Michigan, Ann Arbor, Michigan 48109, USA  L. Scodellaro
Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005
Santander, Spain  F. Scuri  Istituto Nazionale di Fisica Nucleare Pisa,
ggUniversity of Pisa, hhUniversity of Siena and iiScuola Normale Superiore,
I-56127 Pisa, Italy, mmINFN Pavia and University of Pavia, I-27100 Pavia,
Italy  S. Seidel  University of New Mexico, Albuquerque, New Mexico 87131, USA
Y. Seiya  Osaka City University, Osaka 588, Japan  A. Semenov  Joint Institute
for Nuclear Research, RU-141980 Dubna, Russia  F. Sforzagg Istituto Nazionale
di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity of Siena and
iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and University
of Pavia, I-27100 Pavia, Italy  S.Z. Shalhout  University of California,
Davis, Davis, California 95616, USA  T. Shears  University of Liverpool,
Liverpool L69 7ZE, United Kingdom  P.F. Shepard  University of Pittsburgh,
Pittsburgh, Pennsylvania 15260, USA  M. Shimojimav University of Tsukuba,
Tsukuba, Ibaraki 305, Japan  M. Shochet  Enrico Fermi Institute, University of
Chicago, Chicago, Illinois 60637, USA  I. Shreyber-Tecker  Institution for
Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia  A.
Simonenko  Joint Institute for Nuclear Research, RU-141980 Dubna, Russia  P.
Sinervo  Institute of Particle Physics: McGill University, Montréal, Québec
H3A 2T8, Canada; Simon Fraser University, Burnaby, British Columbia V5A 1S6,
Canada; University of Toronto, Toronto, Ontario M5S 1A7, Canada; and TRIUMF,
Vancouver, British Columbia V6T 2A3, Canada  K. Sliwa  Tufts University,
Medford, Massachusetts 02155, USA  J.R. Smith  University of California,
Davis, Davis, California 95616, USA  F.D. Snider  Fermi National Accelerator
Laboratory, Batavia, Illinois 60510, USA  H. Song  University of Pittsburgh,
Pittsburgh, Pennsylvania 15260, USA  V. Sorin  Institut de Fisica d’Altes
Energies, ICREA, Universitat Autonoma de Barcelona, E-08193, Bellaterra
(Barcelona), Spain  M. Stancari  Fermi National Accelerator Laboratory,
Batavia, Illinois 60510, USA  R. St. Denis  Glasgow University, Glasgow G12
8QQ, United Kingdom  B. Stelzer  Institute of Particle Physics: McGill
University, Montréal, Québec H3A 2T8, Canada; Simon Fraser University,
Burnaby, British Columbia V5A 1S6, Canada; University of Toronto, Toronto,
Ontario M5S 1A7, Canada; and TRIUMF, Vancouver, British Columbia V6T 2A3,
Canada  O. Stelzer-Chilton  Institute of Particle Physics: McGill University,
Montréal, Québec H3A 2T8, Canada; Simon Fraser University, Burnaby, British
Columbia V5A 1S6, Canada; University of Toronto, Toronto, Ontario M5S 1A7,
Canada; and TRIUMF, Vancouver, British Columbia V6T 2A3, Canada  D. Stentzx
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  J.
Strologas  University of New Mexico, Albuquerque, New Mexico 87131, USA  Y.
Sudo  University of Tsukuba, Tsukuba, Ibaraki 305, Japan  A. Sukhanov  Fermi
National Accelerator Laboratory, Batavia, Illinois 60510, USA  I. Suslov
Joint Institute for Nuclear Research, RU-141980 Dubna, Russia  K. Takemasa
University of Tsukuba, Tsukuba, Ibaraki 305, Japan  Y. Takeuchi  University of
Tsukuba, Tsukuba, Ibaraki 305, Japan  J. Tang  Enrico Fermi Institute,
University of Chicago, Chicago, Illinois 60637, USA  M. Tecchio  University of
Michigan, Ann Arbor, Michigan 48109, USA  P.K. Teng  Institute of Physics,
Academia Sinica, Taipei, Taiwan 11529, Republic of China  J. Thomg Fermi
National Accelerator Laboratory, Batavia, Illinois 60510, USA  E. Thomson
University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA  V. Thukral
Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M
University, College Station, Texas 77843, USA  D. Toback  Mitchell Institute
for Fundamental Physics and Astronomy, Texas A&M University, College Station,
Texas 77843, USA  S. Tokar  Comenius University, 842 48 Bratislava, Slovakia;
Institute of Experimental Physics, 040 01 Kosice, Slovakia  K. Tollefson
Michigan State University, East Lansing, Michigan 48824, USA  T. Tomura
University of Tsukuba, Tsukuba, Ibaraki 305, Japan  D. Tonellif Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  S. Torre  Laboratori
Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044
Frascati, Italy  D. Torretta  Fermi National Accelerator Laboratory, Batavia,
Illinois 60510, USA  P. Totaro  Istituto Nazionale di Fisica Nucleare, Sezione
di Padova-Trento, ffUniversity of Padova, I-35131 Padova, Italy  M. Trovatoii
Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of Pisa, hhUniversity
of Siena and iiScuola Normale Superiore, I-56127 Pisa, Italy, mmINFN Pavia and
University of Pavia, I-27100 Pavia, Italy  F. Ukegawa  University of Tsukuba,
Tsukuba, Ibaraki 305, Japan  S. Uozumi  Center for High Energy Physics:
Kyungpook National University, Daegu 702-701, Korea; Seoul National
University, Seoul 151-742, Korea; Sungkyunkwan University, Suwon 440-746,
Korea; Korea Institute of Science and Technology Information, Daejeon 305-806,
Korea; Chonnam National University, Gwangju 500-757, Korea; Chonbuk National
University, Jeonju 561-756, Korea; Ewha Womans University, Seoul, 120-750,
Korea  F. Vázquezm University of Florida, Gainesville, Florida 32611, USA  G.
Velev  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  C.
Vellidis  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
C. Vernieriii Istituto Nazionale di Fisica Nucleare Pisa, ggUniversity of
Pisa, hhUniversity of Siena and iiScuola Normale Superiore, I-56127 Pisa,
Italy, mmINFN Pavia and University of Pavia, I-27100 Pavia, Italy  M. Vidal
Purdue University, West Lafayette, Indiana 47907, USA  R. Vilar  Instituto de
Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain  J.
Vizánll Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005
Santander, Spain  M. Vogel  University of New Mexico, Albuquerque, New Mexico
87131, USA  G. Volpi  Laboratori Nazionali di Frascati, Istituto Nazionale di
Fisica Nucleare, I-00044 Frascati, Italy  P. Wagner  University of
Pennsylvania, Philadelphia, Pennsylvania 19104, USA  R. Wallny  University of
California, Los Angeles, Los Angeles, California 90024, USA  S.M. Wang
Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
A. Warburton  Institute of Particle Physics: McGill University, Montréal,
Québec H3A 2T8, Canada; Simon Fraser University, Burnaby, British Columbia V5A
1S6, Canada; University of Toronto, Toronto, Ontario M5S 1A7, Canada; and
TRIUMF, Vancouver, British Columbia V6T 2A3, Canada  D. Waters  University
College London, London WC1E 6BT, United Kingdom  W.C. Wester III  Fermi
National Accelerator Laboratory, Batavia, Illinois 60510, USA  D. Whitesonc
University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA  A.B.
Wicklund  Argonne National Laboratory, Argonne, Illinois 60439, USA  S. Wilbur
Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
H.H. Williams  University of Pennsylvania, Philadelphia, Pennsylvania 19104,
USA  J.S. Wilson  University of Michigan, Ann Arbor, Michigan 48109, USA  P.
Wilson  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
B.L. Winer  The Ohio State University, Columbus, Ohio 43210, USA  P. Wittichg
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA  S.
Wolbers  Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
H. Wolfe  The Ohio State University, Columbus, Ohio 43210, USA  T. Wright
University of Michigan, Ann Arbor, Michigan 48109, USA  X. Wu  University of
Geneva, CH-1211 Geneva 4, Switzerland  Z. Wu  Baylor University, Waco, Texas
76798, USA  K. Yamamoto  Osaka City University, Osaka 588, Japan  D. Yamato
Osaka City University, Osaka 588, Japan  T. Yang  Fermi National Accelerator
Laboratory, Batavia, Illinois 60510, USA  U.K. Yangr Enrico Fermi Institute,
University of Chicago, Chicago, Illinois 60637, USA  Y.C. Yang  Center for
High Energy Physics: Kyungpook National University, Daegu 702-701, Korea;
Seoul National University, Seoul 151-742, Korea; Sungkyunkwan University,
Suwon 440-746, Korea; Korea Institute of Science and Technology Information,
Daejeon 305-806, Korea; Chonnam National University, Gwangju 500-757, Korea;
Chonbuk National University, Jeonju 561-756, Korea; Ewha Womans University,
Seoul, 120-750, Korea  W.-M. Yao  Ernest Orlando Lawrence Berkeley National
Laboratory, Berkeley, California 94720, USA  G.P. Yeh  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  K. Yin Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  J. Yoh  Fermi National
Accelerator Laboratory, Batavia, Illinois 60510, USA  K. Yorita  Waseda
University, Tokyo 169, Japan  T. Yoshidal Osaka City University, Osaka 588,
Japan  G.B. Yu  Duke University, Durham, North Carolina 27708, USA  I. Yu
Center for High Energy Physics: Kyungpook National University, Daegu 702-701,
Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan
University, Suwon 440-746, Korea; Korea Institute of Science and Technology
Information, Daejeon 305-806, Korea; Chonnam National University, Gwangju
500-757, Korea; Chonbuk National University, Jeonju 561-756, Korea; Ewha
Womans University, Seoul, 120-750, Korea  A.M. Zanetti  Istituto Nazionale di
Fisica Nucleare Trieste/Udine; nnUniversity of Trieste, I-34127 Trieste,
Italy; kkUniversity of Udine, I-33100 Udine, Italy  Y. Zeng  Duke University,
Durham, North Carolina 27708, USA  C. Zhou  Duke University, Durham, North
Carolina 27708, USA  S. Zucchelliee Istituto Nazionale di Fisica Nucleare
Bologna, eeUniversity of Bologna, I-40127 Bologna, Italy

###### Abstract

We present a measurement of the top-quark pair production cross-section in
proton-antiproton collisions at $\sqrt{s}$=1.96 TeV. The data were collected
at the Fermilab Tevatron by the CDF II detector and correspond to an
integrated luminosity of 8.8 fb-1, representing the complete CDF Run II data
set. We select events consistent with the production of top-quark pairs by
requiring the presence of two reconstructed leptons, an imbalance in the total
event transverse momentum, and jets. At least one jet is required to be
identified as consistent with the fragmentation of a bottom quark using a
secondary-vertex-finding algorithm. The 246 candidate events are estimated to
have a signal purity of 91%. We measure a cross section of $\sigma_{t\bar{t}}$
= 7.09 $\pm$ 0.84 pb, assuming a top-quark mass of 172.5 GeV/$c^{2}$. The
results are consistent with the standard model as predicted by next-to-
leading-order calculations.

###### pacs:

13.85.Ni, 13.85.Qk, 14.65.Ha

Beginning with the discovery of the top quark ($t$) in 1995 top_cdf ; top_d0 ,
the CDF and D0 experiments at Fermilab have studied its production, decays,
and intrinsic properties TOPMASS ; HELICITY ; RATIO ; D0_XSEC_COMBO ;
CDF_DIL_2p8 ; CDF_LJ_XSEC . This Letter continues that rich program by
reporting the first top-antitop quark pair ($t\bar{t}$) production cross-
section measurement by a Tevatron experiment that utilizes the complete Run II
data set. Studies of the top quark provide both measurements of standard model
(SM) parameters Precision_EW  and probes of non-SM particles or interactions
theory . Top-quark pairs are produced in proton-antiproton collisions at
$\rm\sqrt{s}=1.96$ TeV by the Fermilab Tevatron. We select events for this
measurement if both leptons in the decay chain
$t\bar{t}\rightarrow(W^{+}b)(W^{-}\bar{b})\rightarrow(\ell^{+}{\nu}_{l}b)(\ell^{-}\bar{\nu}_{l}\bar{b})$
are identified. Only reconstructed electron or muon candidates are selected as
leptons. Hadronic decays of tau leptons are not considered. The signal yield
is measured as the number of selected events in the data after subtraction of
the background expectation from other SM sources, and the cross section is
measured by correcting the signal yield for acceptance, efficiency, and
luminosity. This analysis uses the full CDF Run II data set collected between
March 2002 and September 2011, which corresponds to 8.8 fb-1 of integrated
luminosity after data-quality requirements are imposed. The result supersedes
a previous analysis CDF_DIL_2p8  by exploiting a three-fold increase in data
set and improved $t\bar{t}$ signal-to-background ratio. Improved sample purity
is obtained by requiring the presence of jets consistent with the
fragmentation of $b$ quarks ($b$-tagged jets) from the top quark decay.

The CDF II detector is a solenoidal spectrometer surrounded by a sampling
calorimeter and muon detectors CDFII . CDF uses a cylindrical coordinate
system with the origin at the center of the detector and the +$z$ direction
defined by the proton beam. $\theta$ is the polar angle with respect to the
$z$-axis and $\phi$ is the azimuthal angle.

The events were selected for analysis during data taking with an inclusive
selection that required the presence of an electron (a muon) with $E_{T}$
$>\>$18 GeV ($p_{T}$ $>\>$ 18 GeV/$c$). The transverse energy and momentum are
defined as $E_{T}$ = $E\sin(\theta)$ and $p_{T}$ = $p\sin(\theta)$ where $E$
is the energy measured in the calorimeter and $p$ is the momentum measured by
the tracking system. In the offline analysis, we select events that contain at
least one isolated isolated  electron (muon) with $E_{T}$ $>\>$ 20 GeV
($p_{T}$ $>\>$ 20 GeV/$c$). We additionally require the presence of a second
lepton with the same energy requirements, but without isolation requirements.
Events with more than two reconstructed leptons are rejected.

The neutrinos from dilepton top-quark pair decays escape detection, so signal
events are expected to produce a large imbalance in the event total
transverse-energy (${\nobreak\not\\!\\!E_{\rm T}}$) MET  compared to other SM
processes containing two leptons. We require ${\nobreak\not\\!\\!E_{\rm T}}$
$>$ 25 GeV to reduce contamination from processes that do not involve
neutrinos from vector-boson decays. Events in which ${\nobreak\not\\!\\!E_{\rm
T}}$ originates from instrumental effects typically feature a small angle
between the direction of a lepton or jet and the direction of
$\vec{{\nobreak\not\\!\\!E_{\rm T}}}$. If this angle is smaller than 20o, we
require ${\nobreak\not\\!\\!E_{\rm T}}>$ 50 GeV to reject these backgrounds.
To specifically reject events from $Z/\gamma^{*}$ production, we require high
${\nobreak\not\\!\\!E_{\rm T}}$ significance CDF_DIL_2p8  if the identified
leptons have the same flavor and dilepton mass consistent with the $Z$
resonance. We also require the dilepton mass to be larger than 5 GeV/$c^{2}$
to remove events from low-mass dimuon resonances. The resulting sample is
referred to as events meeting the dilepton selection. Jets are identified in
the laboratory frame using a modified cone algorithm jetclu , and are defined
as having $E_{T}$ $>\>$15 GeV and pseudorapidity in the lab frame satisfying
$|\eta|<2.5$. Events satisfying the dilepton selection that contain exactly
zero or one jet are used as control samples for background estimation. The
pretag sample contains events passing the dilepton selection with at least two
jets, summed transverse energy over all particles ($H_{T}$) satisfying $H_{T}$
$>$ 200 GeV, and whose two leptons are of opposite electric charge. The data
sample corresponds to an integrated luminosity of 9.1 fb-1, slightly higher
than the signal sample, because the detector quality requirements for $b$
tagging are not imposed. The pretag sample is used to validate the signal and
background models. We measure the $t\bar{t}$ production cross-section using
the tag sample, which is the subset of pretag events in which at least one of
the jets in the event is $b$ tagged by the secvtx algorithm secvtx .

The lifetime of $B$ hadrons is approximately 1.5 picosecond, so relativistic
$B$ hadrons produced in collisions at the Tevatron can travel on the order of
450 micrometers from the primary interaction-point (primary vertex) before
decaying. We use charged-particle tracks to reconstruct the primary vertex and
secondary decay-vertices. We then compute the two-dimensional displacement of
the secondary vertex from the primary vertex projected along the jet direction
in the plane transverse to the beam ($L_{2D}$). A jet is considered $b$-tagged
by the secvtx algorithm if $L_{2D}$ and its uncertainty ($\sigma$) satisfy the
significance $L_{2D}/\sigma>7.5$. Jets with $L_{2D}/\sigma<-7.5$ are not
topologically consistent with $B$-hadron decays, but are used to estimate the
false-tag rate due to instrumental sources secvtx .

Selection efficiency for $t\bar{t}$ events is estimated using the pythia Monte
Carlo event-generator pythia  combined with a detailed simulation of the CDF
II detector GEANT3 . The $t\bar{t}$ signal is simulated assuming a top-quark
mass of 172.5 GeV/$c^{2}$ and only contains events in which both $W$ bosons
produced by the decay of the top quarks subsequently decay into a charged
lepton ($e$, $\mu$, $\tau$) and a neutrino. Only simulated events with a
primary vertex reconstructed within $\rm\pm 60$ cm of the nominal CDF detector
center are retained. This requirement has an efficiency of [97.47 $\pm$
0.02(stat)]% of the full CDF luminous region. The total acceptance for the
$b$-tagged (pretag) dilepton signal events is [0.461 $\pm$ 0.003(stat)]%
([0.756 $\pm$ 0.004(stat)]%), including the branching fraction to leptons.
This acceptance must be corrected to account for the efficiency of the
inclusive lepton triggers, which are measured using data samples selected by
an independent set of triggering criteria and are in the range 85-95%. The
simulation is also corrected for imperfect modeling of the lepton
identification efficiencies by measuring these efficiencies using
$Z/\gamma^{*}\rightarrow\ell\ell$ events in the data, where one lepton ($\ell$
= $e$ or $\mu$) is fully identified and the other is used for the efficiency
measurement. We use these efficiencies to derive multiplicative correction
factors (in the range 0.8 - 1.0) to apply to the simulated efficiencies. We
correct for the difference in efficiency for the $b$-tagging algorithm between
data and simulated samples by using a multiplicative correction factor,
$S_{b}=0.96\pm 0.05$. This correction accounts for the differences between
properties of jets in $t\bar{t}$ events and jets in the $b$-tagging
calibration sample secvtx .

The relevant background processes yielding prompt lepton pairs are diboson
($WW$, $WZ$, and $ZZ$) production and $Z/\gamma^{*}$ production. Processes in
which a photon or hadronic fragmentation are identified as a lepton are also
considered, such as $W\gamma$ and $W$ boson production in association with
multiple jets. The signal sample contamination is predicted to predominantly
comprise $Z/\gamma^{*}$ and $W$+jets production processes, so their
normalizations are estimated using data samples enriched in these processes.
The contamination for the remaining backgrounds is predicted using the same
detector simulation and corrections used for signal.

Diboson production is simulated with pythia, normalized to the production
cross-sections from the next-to-leading order calculations using MCFM NLO  and
MSTW2008 PDF  parton distribution functions (PDF). The predicted cross
sections are $\sigma_{\it WW}$ = 11.34 $\pm$ 0.68 pb, $\sigma_{\it WZ}$ = 3.47
$\pm$ 0.21 pb, and $\sigma_{\it ZZ}$ = 3.62 $\pm$ 0.22 pb tevnphwg . The
$Z/\gamma^{*}\rightarrow\ell^{+}\ell^{-}$ production is simulated using the
alpgen+pythia event generator alpgen . The $Z/\gamma^{*}\rightarrow
e^{+}e^{-}$, $\mu^{+}\mu^{-}$ samples, which are only selected due to
instrumental mismeasurements, are normalized in a data derived process. The
process $Z/\gamma^{*}\rightarrow\tau^{+}\tau^{-}$ has significant
${\nobreak\not\\!\\!E_{\rm T}}$ from neutrinos, and is treated separately; it
is normalized to the alpgen production rate, corrected for next-to-leading-
order contributions CDF_DIL_2p8 . The $W\gamma$ decays are simulated with the
baur event generator baur , assuming a leading-order production cross-section
of $\sigma_{W\gamma}$ = 32 $\pm$ 3 pb and correcting for higher-order effects
baur2 . This process is observed to be relevant in low jet-multiplicity
control samples, and negligible in the signal sample.

The $WW$ and $Z/\gamma^{*}\rightarrow\tau\tau$ jet multiplicity spectra are
corrected to account for discrepancies observed between data and simulation in
$Z$ boson decays, using jet-multiplicity-dependent correction factors. The
corrections are applied to processes in which jets are produced by initial-
state radiation, rather than from final-state partons in the hard scattering.
The uncertainties on the acceptances of the simulated background processes
come from the convolution of the uncertainties due to finite simulation
sample-size and uncertainties on the jet-multiplicity correction factors,
lepton identification, and jet energy scale JES .

The sample contamination from $Z/\gamma^{*}$ to $ee$ and $\mu\mu$ decays with
instrumental missing energy is estimated in a data sample in which the
dilepton mass for all events is consistent with the $Z$ resonance, but all
other selection criteria are that of the pretag sample. We subtract the
contributions from other processes, and then extrapolate the observed rate
outside of the resonance region by using simulated samples, independently for
each lepton type and jet-multiplicity. The uncertainty on this background
contribution is dominated by the limited number of $Z/\gamma^{*}$ data events
with high ${\nobreak\not\\!\\!E_{\rm T}}$ used to normalize the overall
prediction, from the finite size of the $Z/\gamma^{*}$ events that meet the
selection, and from the uncertainty on the jet-energy scale. The normalization
of the $Z/\gamma^{*}+u,d,s,$ g event yield in the tagged sample is determined
by applying the scalings determined in the pretag sample, and applying false
$b$-tag rates secvtx  as weights to the alpgen+pythia events. We obtain the
$Z/\gamma^{*}+b,c$ event yield normalization in the tagged sample by requiring
events with dilepton mass consistent with the $Z$ resonance, but all other
selection criteria as that of the tag sample. After subtracting the estimated
$Z/\gamma^{*}+u,d,s,$ g component and other backgrounds, the multiplicative
heavy-flavor-specific $Z/\gamma^{*}$ normalization corrections are found to be
$1.8\pm 0.1.$

We estimate a small contribution to the sample of events with one electron and
one muon from $Z/\gamma^{*}$ $\rightarrow$ $\mu\mu$ events, in which
bremsstrahlung associated with one muon mimics an electron signature. These
events are described using the $Z/\gamma^{*}\rightarrow\mu\mu$ simulation
sample. The background from jets misidentified as leptons is estimated by
using data events with exactly one identified lepton and additional lepton-
like candidates that satisfy less restrictive identification criteria (called
the “W+jet” sample, although other sources of misidentified leptons contribute
to this sample as well). The probability that a lepton-like candidate is
reconstructed as a lepton is parametrized in terms of the candidate’s
transverse energy and isolation, and measured in large QCD dijet dominated
samples triggered by the presence of at least one jet of $E_{T}>$ 50 GeV
(called the “jet samples”) CDF_DIL_2p8 . Misidentified leptons are modeled by
applying these probabilities as weights to the events in the W+jet sample with
only one high transverse-energy reconstructed lepton and a second electron-
like or muon-like candidate. To remove events with two good leptons from this
sample, the lepton-like candidate is required to fail at least one lepton
identification requirement. The uncertainty on the misidentified-lepton
background model is dominated by the differences observed between
identification rates determined in jet samples triggered by jets with $E_{T}$
greater than 20, 50, 70, or 100 GeV.

A common systematic uncertainty for signal and simulated background estimates
comes from the uncertainty on the lepton identification correction factors,
which is measured to be 2.2%. The 3.3% uncertainty due to the jet-energy scale
affects all simulated samples, and is estimated by varying the jet-energy
corrections by $\pm 1\sigma$ of their systematic uncertainty and measuring the
shift in signal and background acceptance. We consider several other sources
of systematic uncertainties predominantly affecting the signal efficiency:
difference in $t\bar{t}$ modeling by various simulation generators, simulation
of initial- and final-state radiation, color reconnection, and PDF PDF
uncertainty. These are determined by comparing the uncorrected simulation
acceptance of the default $t\bar{t}$ pythia sample to specialized simulation
samples. The uncertainty due to each of these sources is estimated to be less
than 2.0%. The systematic uncertainty due to the $b$-tagging efficiency
correction is 5.0%, dominated by the light-flavor modeling. All simulated
backgrounds have uncertainty due to the jet-multiplicity correction factor.
Uncorrelated sources of systematic uncertainties affecting individual
backgrounds include the 30% systematic uncertainty on the misidentified lepton
contamination and individual theoretical uncertainties, ranging from 2% to
10%, on the production cross-sections of diboson and
$Z/\gamma^{*}\rightarrow\tau\tau$ processes. Each of these effects contributes
to only a small fraction of the resulting 2.1% (7.1%) background systematic
uncertainty for the $b$-tagged (pretag) sample. Table I summarizes the
systematic uncertainties that affect the signal acceptance and background
model CDF_DIL_2p8 .

Table I: Systematic uncertainties for the pretag and $b$-tagged samples. The total systematic uncertainty is the sum in quadrature of each independent contribution. Source | Uncertainty (%)
---|---
|  XPretagX |  X$b$-taggedX
Lepton identification efficiency | 2.2 | 2.2
Jet energy scale | 3.3 | 3.3
Simulated event generator | 1.9 | 1.9
Initial- and final-state radiationX | 1.3 | 1.3
Color reconnection | 1.2 | 1.2
PDF | 0.6 | 0.6
$b$-tagging | - | 5.0
Background model | 7.1 | 2.1
Total systematic uncertainty | 8.6 | 7.2

The expected and observed background events that are $b$-tagged in the 1-jet
sample are used as a control sample. The final sample of events with two or
more jets passing all candidate selection criteria is given in Table II. The
signal purity in the tag sample is 91%, which can be compared to the 73%
achieved in the pretag sample. In Fig. 1, we present the jet $E_{T}$ spectrum
for the leading two jets in events with at least two jets, and at least one
$b$-tag. The signal yield in the figure is normalized to the measured cross
section, and the shape of the distribution is well described by the
prediction.

Table II:  Estimated number of background and $t\bar{t}$ signal events in the $b$-tagged sample, which corresponds to an integrated luminosity of 8.8 fb-1. The observed event yields are compared with the total SM expectation for both the 1-jet and signal samples. The quoted uncertainties are the quadratic sum of the statistical and systematic uncertainties in each row. In the right column, “$H_{T}$+OS”refers to the requirements that events contain leptons with opposite electric charge and satisfy $H_{T}>200$ GeV. These requirements are not applied to the events in the left column. | 1 jet |  $\geq 2$ jets ($H_{T}$+OS)
---|---|---
Source | (Validation region) | (Signal region)
$WW$ |  0.8 | $\pm$ | 0.2 |  0.6 | $\pm$ | 0.2
$WZ$ |  0.2 | $\pm$ | 0.0 |  0.1 | $\pm$ | 0.0
$ZZ$ |  0.1 | $\pm$ | 0.0 |  0.3 | $\pm$ | 0.1
$Z/\gamma^{*}+u,d,s,$ g |  2.1 | $\pm$ | 0.2 |  2.8 | $\pm$ | 0.3
$Z/\gamma^{*}+b,c$ |  1.8 | $\pm$ | 0.2 |  2.5 | $\pm$ | 0.2
Other |  1.9 | $\pm$ | 0.7 |  16 | $\pm$ | 5
Total background |  6.9 | $\pm$ | 0.9 |  22 | $\pm$ | 5
$t\bar{t}$ ($\sigma=7.09$ pb) |  20.2 | $\pm$ | 1.4 |  224 | $\pm$ | 15
Total SM expectation |  27.1 | $\pm$ | 2.2 |  246 | $\pm$ | 20
Observed |  29 | 246

The measured cross section is calculated as

${\sigma_{t\bar{t}}=\rm\frac{N_{obs}-N_{bkg}}{\sum_{i}\mathcal{A}_{i}\mathcal{L}_{i}}},$
(1)

where Nobs is the number of dilepton candidate events, Nbkg is the total
number of expected background events, and the denominator is the weighted sum
of the corrected acceptance for each class of events grouped by lepton
reconstruction CDF_DIL_2p8 . We multiply $\mathcal{A}_{i}$ by the integrated
luminosity corresponding to the reconstruction class $\mathcal{L}_{i}$.
Various values of integrated luminosities are used because the identification
of events as belonging to each lepton class requires different CDF
subdetectors to be fully functional. The total denominator for the $b$-tagged
events is 31.60 $\pm$ 0.19 pb-1.

Figure 1:  Distribution of jet $E_{T}$ values for the two jets with largest
$E_{T}$ in each event (black points) for the signal sample. The histogram
represents the sum of the signal and background estimates, where the signal is
normalized to the observed cross section. The hatched area is the total
uncertainty on the sum of the signal and background predictions. The lower
panel shows the observed data yield divided by the predicted yield.

For the $b$-tagged $t\bar{t}$ dilepton sample, we measure a cross section of
$\sigma_{t\bar{t}}$ = 7.09 $\pm$ 0.49(stat) $\pm$ 0.52(syst) $\pm$ 0.43(lumi)
pb = 7.09 $\pm$ 0.84 pb with the 246 signal candidate events. The systematic
uncertainty is the convolution of the acceptance and the background
uncertainties shown in Table I. The 6% luminosity uncertainty is kept separate
lum . The results presented here are consistent with the best recent
predictions from next-to-leading order theoretical calculations theory , and
with previous D0 and CDF publications D0_XSEC_COMBO ; CDF_DIL_2p8 . The
current data sample corresponds to an integrated luminosity three times
greater than that of the previous publication CDF_DIL_2p8 , producing a result
with a statistical uncertainty which is smaller than the systematic
uncertainty. The use of $b$-jet identification further improves the signal
purity from 73% to 91%, and the total uncertainty of the measurement has been
improved from 1.04 pb in the previous CDF publication to the current value of
0.84 pb.

In conclusion, we have measured the production cross-section of top-quark
pairs at the Tevatron, using the full CDF Run II data set. This measurement
offers a robust addition to global combined measurements of the top-quark
production cross-section, which can then be used as constraints to theoretical
calculations and limits on non-SM contributions in the top-quark sector.

We thank the Fermilab staff and the technical staffs of the participating
institutions for their vital contributions. This work was supported by the
U.S. Department of Energy and National Science Foundation; the Italian
Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture,
Sports, Science and Technology of Japan; the Natural Sciences and Engineering
Research Council of Canada; the National Science Council of the Republic of
China; the Swiss National Science Foundation; the A.P. Sloan Foundation; the
Bundesministerium für Bildung und Forschung, Germany; the Korean World Class
University Program, the National Research Foundation of Korea; the Science and
Technology Facilities Council and the Royal Society, UK; the Russian
Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and
Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; the Academy of
Finland; the Australian Research Council (ARC); and the EU community Marie
Curie Fellowship contract 302103.

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