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Experimental discrimination between charge 2e/3 top quark and charge 4e/3 exotic quark production scenarios

By V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, M. Agelou, J.L. Agram, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, A. Askew, B. Asman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, P. Bargassa, P. Baringer, C. Barnes, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, L. Berntzon, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, M. Binder, C. Biscarat, K.M. Black, I. Blackler, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, U. Blumenschein, A. Boehnlein, O. Boeriu, T.A. Bolton, F. Borcherding, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, S. Burke, T.H. Burnett, Emmanuel Busato, C.P. Buszello, J.M. Butler, S. Calvet, J. Cammin, S. Caron, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K.M. Chan, A. Chandra, D. Chapin, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, D. Claes, B. Clement, C. Clément, Y. Coadou, J. Coenen, M. Cooke, W.E. Cooper, D. Coppage, M. Corcoran, M.-C. Cousinou, B. Cox, S. Crépé-Renaudin, D. Cutts, M. Cwiok, H. Da Motta, A. Das, M. Das, B. Davies, G. Davies, G.A. Davis, K. De, P. De Jong, S.J. De Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, P. Demine, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, M. Doidge, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, T. Edwards, J. Ellison, J. Elmsheuser, V.D. Elvira, S. Eno, P. Ermolov, J. Estrada, H. Evans, A. Evdokimov, V.N. Evdokimov, S.N. Fatakia, L. Feligioni, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, I. Fleck, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, J. Gardner, V. Gavrilov, A. Gay, Pascal Gay, D. Gelé, R. Gelhaus, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gomez, K. Gounder, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, M. Hohlfeld, S.J. Hong, R. Hooper, P. Houben, Y. Hu, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, A. Jenkins, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Kafer, S. Kahn, E. Kajfasz, A.M. Kalinin, J.M. Kalk, J.R. Kalk, S. Kappler, D. Karmanov, J. Kasper, I. Katsanos, D. Kau, R. Kaur, R. Kehoe, S. Kermiche, S. Kesisoglou, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, J. Kotcher, B. Kothari, A. Koubarovsky, A.V. Kozelov, J. Kozminski, A. Kryemadhi, S. Krzywdzinski, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurca, J. Kvita, S. Lager, S. Lammers, G. Landsberg, J. Lazoflores, A.C. Le Bihan, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, C. Leonidopoulos, V. Lesne, J. Leveque, P. Lewis, J. Li, Q.Z. Li, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, A. Lounis, P. Love, H.J. Lubatti, M. Lynker, A.L. Lyon, A.K.A. Maciel, R.J. Madaras, P. Mattig, C. Magass, A. Magerkurth, A.M. Magnan, N. Makovec, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, M. Martens, S.E.K. Mattingly, R. McCarthy, R. Mccroskey, D. Meder, A. Melnitchouk, A. Mendes, Luis Mendoza, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, M. Michaut, H. Miettinen, T. Millet, J. Mitrevski, J. Molina, N.K. Mondal, J. Monk, R.W. Moore, T. Moulik, G.-S. Muanza, M. Mulders, M. Mulhearn, L. Mundim, Y.D. Mutaf, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, S. Nelson, P. Neustroev, C. Noeding, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, V. Oguri, N. Oliveira, N. Oshima, R. Otec, G.J. Otero Y Garzon, M. Owen, P. Padley, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, P.M. Perea, E. Perez, K. Peters, P. Petroff, M. Petteni, R. Piegaia, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, A. Pompos, B.G. Pope, A.V. Popov, W.L. Prado Da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, K.J. Rani, K. Ranjan, P.A. Rapidis, P.N. Ratoff, P. Renkel, S. Reucroft, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, C. Royon, P. Rubinov, R. Ruchti, V.I. Rud, G. Sajot, A. Sanchez-Hernandez, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, C. Schmitt, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, S. Sengupta, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, W.D. Shephard, R.K. Shivpuri, D. Shpakov, V. Siccardi, R.A. Sidwell, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, R.P. Smith, G.R. Snow, J. Snow, S. Snyder, S. Soldner-Rembold, X. Song, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, K. Stevenson, V. Stolin, A. Stone, D.A. Stoyanova, J. Strandberg, M.A. Strang, M. Strauss, R. Strohmer, D. Strom, M. Strovink, L. Stutte, S. Sumowidagdo, A. Sznajder, M. Talby, P. Tamburello, W. Taylor, P. Telford, J. Temple, B. Tiller, M. Titov, V.V. Tokmenin, M. Tomoto, T. Toole, I. Torchiani, S. Towers, T. Trefzger, S. Trincaz-Duvoid, D. Tsybychev, B. Tuchming, C. Tully, A.S. Turcot, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. Van Den Berg, R. Van Kooten, W.M. Van Leeuwen, N. Varelas, E.W. Varnes, A. Vartapetian, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, J.-R. Vlimant, E. Von Toerne, M. Voutilainen, M. Vreeswijk, H.D. Wahl, L. Wang, J. Warchol, G. Watts, M. Wayne, M. Weber, H. Weerts, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, J. Womersley, D.R. Wood, T.R. Wyatt, Y. Xie, N. Xuan, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, C. Yu, J. Yu, A. Yurkewicz, A. Zatserklyaniy, C. Zeitnitz, D. Zhang, T. Zhao, Z. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, V. Zutshi and E.G. Zverev

Abstract

7 pages, 3 Postscript figures, submitted to Phys. Rev. Lett - D0We present the first experimental discrimination between the 2e/3 and 4e/3 top quark electric charge scenarios, using top quark pairs (ttbar) produced in ppbar collisions at sqrt{s}=1.96 TeV by the Fermilab Tevatron collider. We use 370 pb-1 of data collected by the D0 experiment and select events with at least one high transverse momentum electron or muon, high transverse energy imbalance, and four or more jets. We discriminate between b- and bbar-quark jets by using the charge and momenta of tracks within the jet cones. The data is consistent with the expected electric charge, |q|=2e/3. We exclude, at the 92% C.L., that the sample is solely due to the production of exotic quark pairs QQbar with |q|=4e/3. We place an upper limit on the fraction of QQbar pairs fq < 0.80 at the 90% C.L

Topics: 14.65.Ha, 13.40.-f, 13.85.Rm, 14.80.-j, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: American Physical Society
Year: 2007
DOI identifier: 10.1103/PhysRevLett.98.041801
OAI identifier: oai:HAL:in2p3-00089859v1
Provided by: Hal-Diderot
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