Phys. Rev. Lett.
103,
092001
(2009)
[7 pages]
Observation of Single Top-Quark Production
V. M. Abazov et al. D0 Collaboration
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V. M. Abazov36, B. Abbott74, M. Abolins64, B. S. Acharya29, M. Adams50, T. Adams48, E. Aguilo6, M. Ahsan58, G. D. Alexeev36, G. Alkhazov40, A. Alton64,*, G. Alverson62, G. A. Alves2, L. S. Ancu35, T. Andeen52, M. S. Anzelc52, M. Aoki49, Y. Arnoud14, M. Arov59, M. Arthaud18, A. Askew48,†, B. Åsman41, O. Atramentov48,†, C. Avila8, J. BackusMayes81, F. Badaud13, L. Bagby49, B. Baldin49, D. V. Bandurin58, P. Banerjee29, S. Banerjee29, E. Barberis62, A.-F. Barfuss15, P. Bargassa79, P. Baringer57, J. Barreto2, J. F. Bartlett49, U. Bassler18, D. Bauer43, S. Beale6, A. Bean57, M. Begalli3, M. Begel72, C. Belanger-Champagne41, L. Bellantoni49, A. Bellavance49, J. A. Benitez64, S. B. Beri27, G. Bernardi17, R. Bernhard23, I. Bertram42, M. Besançon18, R. Beuselinck43, V. A. Bezzubov39, P. C. Bhat49, V. Bhatnagar27, G. Blazey51, S. Blessing48, K. Bloom66, A. Boehnlein49, D. Boline61, T. A. Bolton58, E. E. Boos38, G. Borissov42, T. Bose76, A. Brandt77, R. Brock64, G. Brooijmans69, A. Bross49, D. Brown19, X. B. Bu7, N. J. Buchanan48, D. Buchholz52, M. Buehler80, V. Buescher22, V. Bunichev38, S. Burdin42,‡, T. H. Burnett81, C. P. Buszello43, P. Calfayan25, B. Calpas15, S. Calvet16, J. Cammin70, M. A. Carrasco-Lizarraga33, E. Carrera48, W. Carvalho3, B. C. K. Casey49, H. Castilla-Valdez33, S. Chakrabarti71, D. Chakraborty51, K. M. Chan54, A. Chandra47, E. Cheu45, D. K. Cho61, S. Choi32, B. Choudhary28, L. Christofek76, T. Christoudias43, S. Cihangir49, D. Claes66, J. Clutter57, Y. Coadou6,§, M. Cooke49, W. E. Cooper49, M. Corcoran79, F. Couderc18, M.-C. Cousinou15, S. Crépé-Renaudin14, V. Cuplov58, D. Cutts76, M. Ćwiok30, A. Das45, G. Davies43, K. De77, S. J. de Jong35, E. De La Cruz-Burelo33, K. DeVaughan66, F. Déliot18, M. Demarteau49, R. Demina70, D. Denisov49, S. P. Denisov39, S. Desai49, H. T. Diehl49, M. Diesburg49, A. Dominguez66, T. Dorland81, A. Dubey28, L. V. Dudko38, L. Duflot16, D. Duggan48, A. Duperrin15, S. Dutt27, A. Dyshkant51, M. Eads66, D. Edmunds64, J. Ellison47, V. D. Elvira49, Y. Enari76, S. Eno60, P. Ermolov38,d, M. Escalier15, H. Evans53, A. Evdokimov72, V. N. Evdokimov39, A. V. Ferapontov58, T. Ferbel61,70, F. Fiedler24, F. Filthaut35, W. Fisher49, H. E. Fisk49, M. Fortner51, H. Fox42, S. Fu49, S. Fuess49, T. Gadfort69, C. F. Galea35, A. Garcia-Bellido70, V. Gavrilov37, P. Gay13, W. Geist19, W. Geng15,64, C. E. Gerber50, Y. Gershtein48,†, D. Gillberg6, G. Ginther70, B. Gómez8, A. Goussiou81, P. D. Grannis71, S. Greder19, H. Greenlee49, Z. D. Greenwood59, E. M. Gregores4, G. Grenier20, Ph. Gris13, J.-F. Grivaz16, A. Grohsjean25, S. Grünendahl49, M. W. Grünewald30, F. Guo71, J. Guo71, G. Gutierrez49, P. Gutierrez74, A. Haas69, N. J. Hadley60, P. Haefner25, S. Hagopian48, J. Haley67, I. Hall64, R. E. Hall46, L. Han7, K. Harder44, A. Harel70, J. M. Hauptman56, J. Hays43, T. Hebbeker21, D. Hedin51, J. G. Hegeman34, A. P. Heinson47, U. Heintz61, C. Hensel22,**, K. Herner63, G. Hesketh62, M. D. Hildreth54, R. Hirosky80, T. Hoang48, J. D. Hobbs71, B. Hoeneisen12, M. Hohlfeld22, S. Hossain74, P. Houben34, Y. Hu71, Z. Hubacek10, N. Huske17, V. Hynek10, I. Iashvili68, R. Illingworth49, A. S. Ito49, S. Jabeen61, M. Jaffré16, S. Jain74, K. Jakobs23, D. Jamin15, C. Jarvis60, R. Jesik43, K. Johns45, C. Johnson69, M. Johnson49, D. Johnston66, A. Jonckheere49, P. Jonsson43, A. Juste49, E. Kajfasz15, D. Karmanov38, P. A. Kasper49, I. Katsanos66, V. Kaushik77, R. Kehoe78, S. Kermiche15, N. Khalatyan49, A. Khanov75, A. Kharchilava68, Y. N. Kharzheev36, D. Khatidze69, T. J. Kim31, M. H. Kirby52, M. Kirsch21, B. Klima49, J. M. Kohli27, J.-P. Konrath23, A. V. Kozelov39, J. Kraus64, T. Kuhl24, A. Kumar68, A. Kupco11, T. Kurča20, V. A. Kuzmin38, J. Kvita9, F. Lacroix13, D. Lam54, S. Lammers53, G. Landsberg76, P. Lebrun20, W. M. Lee49, A. Leflat38, J. Lellouch17,d, J. Li77, L. Li47, Q. Z. Li49, S. M. Lietti5, J. K. Lim31, D. Lincoln49, J. Linnemann64, V. V. Lipaev39, R. Lipton49, Y. Liu7, Z. Liu6, A. Lobodenko40, M. Lokajicek11, P. Love42, H. J. Lubatti81, R. Luna-Garcia33,††, A. L. Lyon49, A. K. A. Maciel2, D. Mackin79, P. Mättig26, A. Magerkurth63, P. K. Mal81, H. B. Malbouisson3, S. Malik66, V. L. Malyshev36, Y. Maravin58, B. Martin14, R. McCarthy71, C. L. McGivern57, M. M. Meijer35, A. Melnitchouk65, L. Mendoza8, P. G. Mercadante5, M. Merkin38, K. W. Merritt49, A. Meyer21, J. Meyer22,**, J. Mitrevski69, R. K. Mommsen44, N. K. Mondal29, R. W. Moore6, T. Moulik57, G. S. Muanza15, M. Mulhearn69, O. Mundal22, L. Mundim3, E. Nagy15, M. Naimuddin49, M. Narain76, H. A. Neal63, J. P. Negret8, P. Neustroev40, H. Nilsen23, H. Nogima3, S. F. Novaes5, T. Nunnemann25, D. C. O’Neil6, G. Obrant40, C. Ochando16, D. Onoprienko58, J. Orduna33, N. Oshima49, N. Osman43, J. Osta54, R. Otec10, G. J. Otero y Garzón1, M. Owen44, M. Padilla47, P. Padley79, M. Pangilinan76, N. Parashar55, S.-J. Park22,**, S. K. Park31, J. Parsons69, R. Partridge76, N. Parua53, A. Patwa72, G. Pawloski79, B. Penning23, M. Perfilov38, K. Peters44, Y. Peters44, P. Pétroff16, R. Piegaia1, J. Piper64, M.-A. Pleier22, P. L. M. Podesta-Lerma33,‡‡, V. M. Podstavkov49, Y. Pogorelov54, M.-E. Pol2, P. Polozov37, A. V. Popov39, C. Potter6, W. L. Prado da Silva3, H. B. Prosper48, S. Protopopescu72, J. Qian63, A. Quadt22,**, B. Quinn65, A. Rakitine42, M. S. Rangel16, K. Ranjan28, P. N. Ratoff42, P. Renkel78, P. Rich44, M. Rijssenbeek71, I. Ripp-Baudot19, F. Rizatdinova75, S. Robinson43, R. F. Rodrigues3, M. Rominsky74, C. Royon18, P. Rubinov49, R. Ruchti54, G. Safronov37, G. Sajot14, A. Sánchez-Hernández33, M. P. Sanders17, B. Sanghi49, G. Savage49, L. Sawyer59, T. Scanlon43, D. Schaile25, R. D. Schamberger71, Y. Scheglov40, H. Schellman52, T. Schliephake26, S. Schlobohm81, C. Schwanenberger44, R. Schwienhorst64, J. Sekaric48, H. Severini74, E. Shabalina50, M. Shamim58, V. Shary18, A. A. Shchukin39, R. K. Shivpuri28, V. Siccardi19, V. Simak10, V. Sirotenko49, P. Skubic74, P. Slattery70, D. Smirnov54, G. R. Snow66, J. Snow73, S. Snyder72, S. Söldner-Rembold44, L. Sonnenschein21, A. Sopczak42, M. Sosebee77, K. Soustruznik9, B. Spurlock77, J. Stark14, V. Stolin37, D. A. Stoyanova39, J. Strandberg63, S. Strandberg41, M. A. Strang68, E. Strauss71, M. Strauss74, R. Ströhmer25, D. Strom52, L. Stutte49, S. Sumowidagdo48, P. Svoisky35, M. Takahashi44, A. Tanasijczuk1, W. Taylor6, B. Tiller25, F. Tissandier13, M. Titov18, V. V. Tokmenin36, I. Torchiani23, D. Tsybychev71, B. Tuchming18, C. Tully67, P. M. Tuts69, R. Unalan64, L. Uvarov40, S. Uvarov40, S. Uzunyan51, B. Vachon6, P. J. van den Berg34, R. Van Kooten53, W. M. van Leeuwen34, N. Varelas50, E. W. Varnes45, I. A. Vasilyev39, P. Verdier20, L. S. Vertogradov36, M. Verzocchi49, D. Vilanova18, P. Vint43, P. Vokac10, M. Voutilainen66,a, R. Wagner67, H. D. Wahl48, M. H. L. S. Wang49, J. Warchol54, G. Watts81, M. Wayne54, G. Weber24, M. Weber49,b, L. Welty-Rieger53, A. Wenger23,c, M. Wetstein60, A. White77, D. Wicke26, M. R. J. Williams42, G. W. Wilson57, S. J. Wimpenny47, M. Wobisch59, D. R. Wood62, T. R. Wyatt44, Y. Xie76, C. Xu63, S. Yacoob52, R. Yamada49, W.-C. Yang44, T. Yasuda49, Y. A. Yatsunenko36, Z. Ye49, H. Yin7, K. Yip72, H. D. Yoo76, S. W. Youn52, J. Yu77, C. Zeitnitz26, S. Zelitch80, T. Zhao81, B. Zhou63, J. Zhu71, M. Zielinski70, D. Zieminska53, L. Zivkovic69, V. Zutshi51, and E. G. Zverev38 (D0 Collaboration)
1Universidad de Buenos Aires, Buenos Aires, Argentina 2LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil 3Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil 4Universidade Federal do ABC, Santo André, Brazil 5Instituto de Física Teórica, Universidade Estadual Paulista, São Paulo, Brazil 6University of Alberta, Edmonton, Alberta, Canada; Simon Fraser University, Burnaby, British Columbia, Canada; York University, Toronto, Ontario, Canada and McGill University, Montreal, Quebec, Canada 7University of Science and Technology of China, Hefei, People’s Republic of China 8Universidad de los Andes, Bogotá, Colombia 9Center for Particle Physics, Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic 10Czech Technical University in Prague, Prague, Czech Republic 11Center for Particle Physics, Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic 12Universidad San Francisco de Quito, Quito, Ecuador 13LPC, Université Blaise Pascal, CNRS/IN2P3, Clermont, France 14LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, Grenoble, France 15CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France 16LAL, Université Paris-Sud, IN2P3/CNRS, Orsay, France 17LPNHE, IN2P3/CNRS, Universités Paris VI and VII, Paris, France 18CEA, Irfu, SPP, Saclay, France 19IPHC, Université de Strasbourg, CNRS/IN2P3, Strasbourg, France 20IPNL, Université Lyon 1, CNRS/IN2P3, Villeurbanne, France and Université de Lyon, Lyon, France 21III. Physikalisches Institut A, RWTH Aachen University, Aachen, Germany 22Physikalisches Institut, Universität Bonn, Bonn, Germany 23Physikalisches Institut, Universität Freiburg, Freiburg, Germany 24Institut für Physik, Universität Mainz, Mainz, Germany 25Ludwig-Maximilians-Universität München, München, Germany 26Fachbereich Physik, University of Wuppertal, Wuppertal, Germany 27Panjab University, Chandigarh, India 28Delhi University, Delhi, India 29Tata Institute of Fundamental Research, Mumbai, India 30University College Dublin, Dublin, Ireland 31Korea Detector Laboratory, Korea University, Seoul, Korea 32SungKyunKwan University, Suwon, Korea 33CINVESTAV, Mexico City, Mexico 34FOM-Institute NIKHEF and University of Amsterdam/NIKHEF, Amsterdam, The Netherlands 35Radboud University Nijmegen/NIKHEF, Nijmegen, The Netherlands 36Joint Institute for Nuclear Research, Dubna, Russia 37Institute for Theoretical and Experimental Physics, Moscow, Russia 38Moscow State University, Moscow, Russia 39Institute for High Energy Physics, Protvino, Russia 40Petersburg Nuclear Physics Institute, St. Petersburg, Russia 41Stockholm University, Stockholm, Sweden, and Uppsala University, Uppsala, Sweden 42Lancaster University, Lancaster, United Kingdom 43Imperial College, London, United Kingdom 44University of Manchester, Manchester, United Kingdom 45University of Arizona, Tucson, Arizona 85721, USA 46California State University, Fresno, California 93740, USA 47University of California, Riverside, California 92521, USA 48Florida State University, Tallahassee, Florida 32306, USA 49Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA 50University of Illinois at Chicago, Chicago, Illinois 60607, USA 51Northern Illinois University, DeKalb, Illinois 60115, USA 52Northwestern University, Evanston, Illinois 60208, USA 53Indiana University, Bloomington, Indiana 47405, USA 54University of Notre Dame, Notre Dame, Indiana 46556, USA 55Purdue University Calumet, Hammond, Indiana 46323, USA 56Iowa State University, Ames, Iowa 50011, USA 57University of Kansas, Lawrence, Kansas 66045, USA 58Kansas State University, Manhattan, Kansas 66506, USA 59Louisiana Tech University, Ruston, Louisiana 71272, USA 60University of Maryland, College Park, Maryland 20742, USA 61Boston University, Boston, Massachusetts 02215, USA 62Northeastern University, Boston, Massachusetts 02115, USA 63University of Michigan, Ann Arbor, Michigan 48109, USA 64Michigan State University, East Lansing, Michigan 48824, USA 65University of Mississippi, University, Mississippi 38677, USA 66University of Nebraska, Lincoln, Nebraska 68588, USA 67Princeton University, Princeton, New Jersey 08544, USA 68State University of New York, Buffalo, New York 14260, USA 69Columbia University, New York, New York 10027, USA 70University of Rochester, Rochester, New York 14627, USA 71State University of New York, Stony Brook, New York 11794, USA 72Brookhaven National Laboratory, Upton, New York 11973, USA 73Langston University, Langston, Oklahoma 73050, USA 74University of Oklahoma, Norman, Oklahoma 73019, USA 75Oklahoma State University, Stillwater, Oklahoma 74078, USA 76Brown University, Providence, Rhode Island 02912, USA 77University of Texas, Arlington, Texas 76019, USA 78Southern Methodist University, Dallas, Texas 75275, USA 79Rice University, Houston, Texas 77005, USA 80University of Virginia, Charlottesville, Virginia 22901, USA 81University of Washington, Seattle, Washington 98195, USA

Received 4 March 2009; revised 10 April 2009; published 24 August 2009
See accompanying
Physics
Synopsis
We report observation of the electroweak production of single top quarks in pp̅ collisions at √s=1.96 TeV based on 2.3 fb-1 of data collected by the D0 detector at the Fermilab Tevatron Collider. Using events containing an isolated electron or muon and missing transverse energy, together with jets originating from the fragmentation of b quarks, we measure a cross section of σ(pp̅ →tb+X,tqb+X)=3.94±0.88 pb. The probability to measure a cross section at this value or higher in the absence of signal is 2.5×10-7, corresponding to a 5.0 standard deviation significance for the observation.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.092001
DOI:
10.1103/PhysRevLett.103.092001
PACS:
14.65.Ha, 12.15.Hh, 12.15.Ji, 13.85.Qk
*Visitor from Augustana College, Sioux Falls, SD, USA. †Visitor from Rutgers University, Piscataway, NJ, USA. ‡Visitor from The University of Liverpool, Liverpool, United Kingdom. §Visitor from CERN, Geneva, Switzerland. **Visitor from II. Physikalisches Institut, Georg-August-University, Göttingen, Germany. ††Visitor from Centro de Investigacion en Computacion - IPN, Mexico City, Mexico. ‡‡Visitor from ECFM, Universidad Autonoma de Sinaloa, Culiacán, Mexico. aVisitor from Helsinki Institute of Physics, Helsinki, Finland. bVisitor from Universität Bern, Bern, Switzerland. cVisitor from Universität Zürich, Zürich, Switzerland. dDeceased.
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