Phys. Rev. Lett.
102,
041801
(2009)
[7 pages]
Search for Maximal Flavor Violating Scalars in Same-Charge Lepton Pairs in pp̅ Collisions at √s=1.96 TeV
T. Aaltonen et al. CDF Collaboration
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T. Aaltonen24, J. Adelman14, T. Akimoto55, M. G. Albrow18, B. Álvarez González12, S. Amerio43, D. Amidei35, A. Anastassov52, A. Annovi20, J. Antos15, M. Aoki25, G. Apollinari18, A. Apresyan48, T. Arisawa57, A. Artikov16, W. Ashmanskas18, A. Attal4, A. Aurisano53, F. Azfar42, P. Azzi-Bacchetta43, P. Azzurri46, N. Bacchetta43, W. Badgett18, A. Barbaro-Galtieri29, V. E. Barnes48, B. A. Barnett26, S. Baroiant8, S. Bar-Shalom61, V. Bartsch31, G. Bauer33, P.-H. Beauchemin34, F. Bedeschi46, P. Bednar15, S. Behari26, G. Bellettini46, J. Bellinger59, A. Belloni23, D. Benjamin17, A. Beretvas18, J. Beringer29, T. Berry30, A. Bhatti50, M. Binkley18, D. Bisello43, I. Bizjak31, R. E. Blair3, C. Blocker7, B. Blumenfeld26, A. Bocci17, A. Bodek49, V. Boisvert49, G. Bolla48, A. Bolshov33, D. Bortoletto48, J. Boudreau47, A. Boveia11, B. Brau11, A. Bridgeman25, L. Brigliadori6, C. Bromberg36, E. Brubaker14, J. Budagov16, H. S. Budd49, S. Budd25, K. Burkett18, G. Busetto43, P. Bussey22, A. Buzatu34, K. L. Byrum3, S. Cabrera17,k, M. Campanelli36, M. Campbell35, F. Canelli18, A. Canepa45, D. Carlsmith59, R. Carosi46, S. Carrillo19,e, S. Carron34, B. Casal12, M. Casarsa18, A. Castro6, P. Catastini46, D. Cauz54, M. Cavalli-Sforza4, A. Cerri29, L. Cerrito31,i, S. H. Chang28, Y. C. Chen1, M. Chertok8, G. Chiarelli46, G. Chlachidze18, F. Chlebana18, K. Cho28, D. Chokheli16, J. P. Chou23, G. Choudalakis33, S. H. Chuang52, K. Chung13, W. H. Chung59, Y. S. Chung49, C. I. Ciobanu25, M. A. Ciocci46, A. Clark21, D. Clark7, G. Compostella43, M. E. Convery18, J. Conway8, B. Cooper31, K. Copic35, M. Cordelli20, G. Cortiana43, F. Crescioli46, C. Cuenca Almenar8,k, J. Cuevas12,h, R. Culbertson18, J. C. Cully35, D. Dagenhart18, M. Datta18, T. Davies22, P. de Barbaro49, S. De Cecco51, A. Deisher29, G. De Lentdecker49,§, G. De Lorenzo4, M. Dell’Orso46, L. Demortier50, J. Deng17, M. Deninno6, D. De Pedis51, P. F. Derwent18, G. P. Di Giovanni44, C. Dionisi51, B. Di Ruzza54, J. R. Dittmann5, M. D’Onofrio4, S. 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Ukegawa55, S. Uozumi55, S. Vallecorsa21, N. van Remortel24, A. Varganov35, E. Vataga37, F. Vázquez19,e, G. Velev18, C. Vellidis46,*, V. Veszpremi48, M. Vidal32, R. Vidal18, I. Vila12, R. Vilar12, T. Vine31, M. Vogel37, I. Volobouev29,j, G. Volpi46, F. Würthwein10, P. Wagner45, R. G. Wagner3, R. L. Wagner18, J. Wagner-Kuhr27, W. Wagner27, T. Wakisaka41, R. Wallny9, S. M. Wang1, A. Warburton34, D. Waters31, M. Weinberger53, W. C. Wester, III18, B. Whitehouse56, D. Whiteson45,**, A. B. Wicklund3, E. Wicklund18, G. Williams34, H. H. Williams45, P. Wilson18, B. L. Winer39, P. Wittich18,‡‡, S. Wolbers18, C. Wolfe14, T. Wright35, X. Wu21, S. M. Wynne30, A. Yagil10, K. Yamamoto41, J. Yamaoka52, T. Yamashita40, C. Yang60, U. K. Yang14,f, Y. C. Yang28, W. M. Yao29, G. P. Yeh18, J. Yoh18, K. Yorita14, T. Yoshida41, G. B. Yu49, F. Yu61, I. Yu28, S. S. Yu18, J. C. Yun18, L. Zanello51, A. Zanetti54, I. Zaw23, X. Zhang25, Y. Zheng9,†, and S. Zucchelli6 (CDF Collaboration)
1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China 2Informatics Institute, University of Amsterdam, Amsterdam, The Netherlands 3Argonne National Laboratory, Argonne, Illinois 60439, USA 4Institut de Fisica d’Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain 5Baylor University, Waco, Texas 76798, USA 6Istituto Nazionale di Fisica Nucleare, University 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, Canada H3A 2T8; and University of Toronto, Toronto, Canada M5S 1A7 35University of Michigan, Ann Arbor, Michigan 48109, USA 36Michigan State University, East Lansing, Michigan 48824, USA 37University of New Mexico, Albuquerque, New Mexico 87131, USA 38Northwestern University, Evanston, Illinois 60208, USA 39The Ohio State University, Columbus, Ohio 43210, USA 40Okayama University, Okayama 700-8530, Japan 41Osaka City University, Osaka 588, Japan 42University of Oxford, Oxford OX1 3RH, United Kingdom 43University of Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy 44LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, F-75252 France 45University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA 46Istituto Nazionale di Fisica Nucleare Pisa, Universities of Pisa, Siena and Scuola Normale Superiore, I-56127 Pisa, Italy 47University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA 48Purdue University, West Lafayette, Indiana 47907, USA 49University of Rochester, Rochester, New York 14627, USA 50The Rockefeller University, New York, New York 10021, USA 51Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, University of Rome “La Sapienza,” I-00185 Roma, Italy 52Rutgers University, Piscataway, New Jersey 08855, USA 53Texas A&M University, College Station, Texas 77843, USA 54Istituto Nazionale di Fisica Nucleare, University of Trieste/Udine, Italy 55University of Tsukuba, Tsukuba, Ibaraki 305, Japan 56Tufts University, Medford, Massachusetts 02155, USA 57Waseda University, Tokyo 169, Japan 58Wayne State University, Detroit, Michigan 48201, USA 59University of Wisconsin, Madison, Wisconsin 53706, USA 60Yale University, New Haven, Connecticut 06520, USA 61University of California, Irvine, California 92617, USA
Received 29 September 2008; published 27 January 2009
Models of maximal flavor violation (MxFV) in elementary particle physics may contain at least one new scalar SU(2) doublet field ΦFV=(η0,η+) that couples the first and third generation quarks (q1, q3) via a Lagrangian term LFV=ξ13ΦFVq1q3. These models have a distinctive signature of same-charge top-quark pairs and evade flavor-changing limits from meson mixing measurements. Data corresponding to 2 fb-1 collected by the Collider Dectector at Fermilab II detector in pp̅ collisions at √s=1.96 TeV are analyzed for evidence of the MxFV signature. For a neutral scalar η0 with mη0=200 GeV/c2 and coupling ξ13=1, ∼11 signal events are expected over a background of 2.1±1.8 events. Three events are observed in the data, consistent with background expectations, and limits are set on the coupling ξ13 for mη0=180–300 GeV/c2.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.041801
DOI:
10.1103/PhysRevLett.102.041801
PACS:
13.85.Ni, 12.15.Ff, 12.60.Fr, 13.85.Qk
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