Phys. Rev. Lett.
102,
151801
(2009)
[7 pages]
Search for Top-Quark Production via Flavor-Changing Neutral Currents in W+1 Jet Events at CDF
T. Aaltonen et al. CDF Collaboration
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T. Aaltonen24, J. Adelman14, T. Akimoto56, B. Álvarez González12,m, S. Amerio44b,44a, D. Amidei35, A. Anastassov39, A. Annovi20, J. Antos15, G. Apollinari18, A. Apresyan49, T. Arisawa58, A. Artikov16, W. Ashmanskas18, A. Attal4, A. Aurisano54, F. Azfar43, P. Azzurri47b,47a, W. Badgett18, A. Barbaro-Galtieri29, V. E. Barnes49, B. A. Barnett26, V. Bartsch31, G. Bauer33, P.-H. Beauchemin34, F. Bedeschi47a, D. Beecher31, S. Behari26, G. Bellettini47b,47a, J. Bellinger60, D. Benjamin17, A. Beretvas18, J. Beringer29, A. Bhatti51, M. Binkley18, D. Bisello44b,44a, I. Bizjak31,r, R. E. Blair2, C. Blocker7, B. Blumenfeld26, A. Bocci17, A. Bodek50, V. Boisvert50, G. Bolla49, D. Bortoletto49, J. Boudreau48, A. Boveia11, B. Brau11,†, A. Bridgeman25, L. Brigliadori44a, C. Bromberg36, E. Brubaker14, J. Budagov16, H. S. Budd50, S. Budd25, S. Burke18, K. Burkett18, G. Busetto44b,44a, P. Bussey22, A. Buzatu34, K. L. Byrum2, S. Cabrera17,o, C. Calancha32, M. Campanelli36, M. Campbell35, F. Canelli14,18, A. Canepa46, B. Carls25, D. Carlsmith60, R. Carosi47a, S. Carrillo19,h, S. Carron34, B. Casal12, M. Casarsa18, A. Castro6b,6a, P. Catastini47c,47a, D. Cauz55b,55a, V. Cavaliere47c,47a, M. Cavalli-Sforza4, A. Cerri29, L. Cerrito31,i, S. H. Chang28, Y. C. Chen1, M. Chertok8, G. Chiarelli47a, G. Chlachidze18, F. Chlebana18, K. Cho28, D. Chokheli16, J. P. Chou23, G. Choudalakis33, S. H. Chuang53, K. Chung13, W. H. Chung60, Y. S. Chung50, T. Chwalek27, C. I. Ciobanu45, M. A. Ciocci47c,47a, A. Clark21, D. Clark7, G. Compostella44a, M. E. Convery18, J. Conway8, M. Cordelli20, G. Cortiana44b,44a, C. A. Cox8, D. J. Cox8, F. Crescioli47b,47a, C. Cuenca Almenar8,o, J. Cuevas12,m, R. Culbertson18, J. C. Cully35, D. Dagenhart18, M. Datta18, T. Davies22, P. de Barbaro50, S. De Cecco52a, A. Deisher29, G. De Lorenzo4, M. Dell’Orso47b,47a, C. Deluca4, L. Demortier51, J. Deng17, M. Deninno6a, P. F. Derwent18, G. P. di Giovanni45, C. Dionisi52b,52a, B. Di Ruzza55b,55a, J. R. Dittmann5, M. D’Onofrio4, S. Donati47b,47a, P. Dong9, J. Donini44a, T. Dorigo44a, S. Dube53, J. Efron40, A. Elagin54, R. Erbacher8, D. Errede25, S. Errede25, R. Eusebi18, H. C. Fang29, S. Farrington43, W. T. Fedorko14, R. G. Feild61, M. Feindt27, J. P. Fernandez32, C. Ferrazza47d,47a, R. Field19, G. Flanagan49, R. Forrest8, M. J. Frank5, M. Franklin23, J. C. Freeman18, I. Furic19, M. Gallinaro52a, J. Galyardt13, F. Garberson11, J. E. Garcia21, A. F. Garfinkel49, K. Genser18, H. Gerberich25, D. Gerdes35, A. Gessler27, S. Giagu52b,52a, V. Giakoumopoulou3, P. Giannetti47a, K. Gibson48, J. L. Gimmell50, C. M. Ginsburg18, N. Giokaris3, M. Giordani55b,55a, P. Giromini20, M. Giunta47b,47a, G. Giurgiu26, V. Glagolev16, D. Glenzinski18, M. Gold38, N. Goldschmidt19, A. Golossanov18, G. Gomez12, G. Gomez-Ceballos33, M. Goncharov33, O. González32, I. Gorelov38, A. T. Goshaw17, K. Goulianos51, A. Gresele44b,44a, S. Grinstein23, C. Grosso-Pilcher14, R. C. Group18, U. Grundler25, J. Guimaraes da Costa23, Z. 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Martínez-Ballarín32, T. Maruyama56, P. Mastrandrea52a, T. Masubuchi56, M. Mathis26, M. E. Mattson59, P. Mazzanti6a, K. S. McFarland50, P. McIntyre54, R. McNulty30,d, A. Mehta30, P. Mehtala24, A. Menzione47a, P. Merkel49, C. Mesropian51, T. Miao18, N. Miladinovic7, R. Miller36, C. Mills23, M. Milnik27, A. Mitra1, G. Mitselmakher19, H. Miyake56, N. Moggi6a, C. S. Moon28, R. Moore18, M. J. Morello47b,47a, J. Morlock27, P. Movilla Fernandez18, J. Mülmenstädt29, A. Mukherjee18, Th. Muller27, R. Mumford26, P. Murat18, M. Mussini6b,6a, J. Nachtman18, Y. Nagai56, A. Nagano56, J. Naganoma56, K. Nakamura56, I. Nakano41, A. Napier57, V. Necula17, J. Nett60, C. Neu46,p, M. S. Neubauer25, S. Neubauer27, J. Nielsen29,a, L. Nodulman2, M. Norman10, O. Norniella25, E. Nurse31, L. Oakes43, S. H. Oh17, Y. D. Oh28, I. Oksuzian19, T. Okusawa42, R. Orava24, K. Osterberg24, S. Pagan Griso44b,44a, E. Palencia18, V. Papadimitriou18, A. Papaikonomou27, A. A. Paramonov14, B. Parks40, S. Pashapour34, J. Patrick18, G. Pauletta55b,55a, M. Paulini13, C. Paus33, T. Peiffer27, D. E. Pellett8, A. Penzo55a, T. J. Phillips17, G. Piacentino47a, E. Pianori46, L. Pinera19, K. Pitts25, C. Plager9, L. Pondrom60, O. Poukhov16,*, N. Pounder43, F. Prakoshyn16, A. Pronko18, J. Proudfoot2, F. Ptohos18,c, E. Pueschel13, G. Punzi47b,47a, J. Pursley60, J. Rademacker43,§, A. Rahaman48, V. Ramakrishnan60, N. Ranjan49, I. Redondo32, P. Renton43, M. Renz27, M. Rescigno52a, S. Richter27, F. Rimondi6b,6a, L. Ristori47a, A. Robson22, T. Rodrigo12, T. Rodriguez46, E. Rogers25, S. Rolli57, R. Roser18, M. Rossi55a, R. Rossin11, P. Roy34, A. Ruiz12, J. Russ13, V. Rusu18, B. Rutherford18, H. Saarikko24, A. Safonov54, W. K. Sakumoto50, O. Saltó4, L. Santi55b,55a, S. Sarkar52b,52a, L. Sartori47a, K. Sato18, A. Savoy-Navarro45, P. Schlabach18, A. Schmidt27, E. E. Schmidt18, M. A. Schmidt14, M. P. Schmidt61,*, M. Schmitt39, T. Schwarz8, L. Scodellaro12, A. Scribano47c,47a, F. Scuri47a, A. Sedov49, S. Seidel38, Y. 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Ukegawa56, S. Vallecorsa21, N. van Remortel24,‡, A. Varganov35, E. Vataga47d,47a, F. Vázquez19,h, G. Velev18, C. Vellidis3, M. Vidal32, R. Vidal18, I. Vila12, R. Vilar12, T. Vine31, M. Vogel38, I. Volobouev29,n, G. Volpi47b,47a, P. Wagner46, R. G. Wagner2, R. L. Wagner18, W. Wagner27,q, J. Wagner-Kuhr27, T. Wakisaka42, R. Wallny9, S. M. Wang1, A. Warburton34, D. Waters31, M. Weinberger54, J. Weinelt27, W. C. Wester, III18, B. Whitehouse57, D. Whiteson46,‡‡, A. B. Wicklund2, E. Wicklund18, S. Wilbur14, G. Williams34, H. H. Williams46, P. Wilson18, B. L. Winer40, P. Wittich18,b, S. Wolbers18, C. Wolfe14, T. Wright35, X. Wu21, F. Würthwein10, S. Xie33, A. Yagil10, K. Yamamoto42, J. Yamaoka17, U. K. Yang14,j, Y. C. Yang28, W. M. Yao29, G. P. Yeh18, J. Yoh18, K. Yorita58, T. Yoshida42,g, G. B. Yu50, I. Yu28, S. S. Yu18, J. C. Yun18, L. Zanello52b,52a, A. Zanetti55a, X. Zhang25, Y. Zheng9,**, and S. Zucchelli6b,6a (CDF Collaboration)
1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China 2Argonne National Laboratory, Argonne, Illinois 60439, USA 3University of Athens, 157 71 Athens, Greece 4Institut de Fisica d’Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain 5Baylor University, Waco, Texas 76798, USA 6aIstituto Nazionale di Fisica Nucleare Bologna, I-40127 Bologna, Italy 6bUniversity of Bologna, I-40127 Bologna, Italy 7Brandeis University, Waltham, Massachusetts 02254, USA 8University of California, Davis, Davis, California 95616, USA 9University of California, Los Angeles, Los Angeles, California 90024, USA 10University of California, San Diego, La Jolla, California 92093, USA 11University of California, Santa Barbara, Santa Barbara, California 93106, USA 12Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain 13Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA 14Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA 15Comenius University, 842 48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice, Slovakia 16Joint Institute for Nuclear Research, RU-141980 Dubna, Russia 17Duke University, Durham, North Carolina 27708, USA 18Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA 19University of Florida, Gainesville, Florida 32611, USA 20Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy 21University of Geneva, CH-1211 Geneva 4, Switzerland 22Glasgow University, Glasgow G12 8QQ, United Kingdom 23Harvard University, Cambridge, Massachusetts 02138, USA 24Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland 25University of Illinois, Urbana, Illinois 61801, USA 26The Johns Hopkins University, Baltimore, Maryland 21218, USA 27Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany 28Center 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 29Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 30University of Liverpool, Liverpool L69 7ZE, United Kingdom 31University College London, London WC1E 6BT, United Kingdom 32Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, E-28040 Madrid, Spain 33Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 34Institute of Particle Physics: McGill University, Montréal, Québec, Canada H3A 2T8; Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6; University of Toronto, Toronto, Ontario, Canada M5S 1A7; and TRIUMF, Vancouver, British Columbia, Canada V6T 2A3 35University of Michigan, Ann Arbor, Michigan 48109, USA 36Michigan State University, East Lansing, Michigan 48824, USA 37Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia 38University of New Mexico, Albuquerque, New Mexico 87131, USA 39Northwestern University, Evanston, Illinois 60208, USA 40The Ohio State University, Columbus, Ohio 43210, USA 41Okayama University, Okayama 700-8530, Japan 42Osaka City University, Osaka 588, Japan 43University of Oxford, Oxford OX1 3RH, United Kingdom 44aIstituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy 44bUniversity of Padova, I-35131 Padova, Italy 45LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, F-75252 France 46University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA 47aIstituto Nazionale di Fisica Nucleare Pisa, I-56127 Pisa, Italy 47bUniversity of Pisa, I-56127 Pisa, Italy 47cUniversity of Siena, I-56127 Pisa, Italy 47dScuola Normale Superiore, I-56127 Pisa, Italy 48University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA 49Purdue University, West Lafayette, Indiana 47907, USA 50University of Rochester, Rochester, New York 14627, USA 51The Rockefeller University, New York, New York 10021, USA 52aIstituto Nazionale di Fisica Nucleare, Sezione di Roma 1, I-00185 Roma, Italy 52bSapienza Università di Roma, I-00185 Roma, Italy 53Rutgers University, Piscataway, New Jersey 08855, USA 54Texas A&M University, College Station, Texas 77843, USA 55aIstituto Nazionale di Fisica Nucleare Trieste/Udine, I-34100 Trieste, Italy 55bUniversity of Trieste/Udine, I-33100 Udine, Italy 56University of Tsukuba, Tsukuba, Ibaraki 305, Japan 57Tufts University, Medford, Massachusetts 02155, USA 58Waseda University, Tokyo 169, Japan 59Wayne State University, Detroit, Michigan 48201, USA 60University of Wisconsin, Madison, Wisconsin 53706, USA 61Yale University, New Haven, Connecticut 06520, USA
Received 14 January 2009; published 16 April 2009
We report on a search for the non-standard-model process u(c)+g→t using pp̅ collision data collected by the Collider Detector at Fermilab II detector corresponding to 2.2 fb-1. The candidate events are classified as signal-like or backgroundlike by an artificial neural network. The observed discriminant distribution yields no evidence for flavor-changing neutral current top-quark production, resulting in an upper limit on the production cross section σ(u(c)+g→t)<1.8 pb at the 95% C.L. Using theoretical predictions we convert the cross section limit to upper limits on flavor-changing neutral current branching ratios: B(t→u+g)<3.9×10-4 and B(t→c+g)<5.7×10-3.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.151801
DOI:
10.1103/PhysRevLett.102.151801
PACS:
13.85.Rm, 12.15.Mm, 14.65.Ha
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