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Evidence for production of single top quarks

Authors
Abazov, V. M.Abbott, B.Abolins, M.Acharya, B. S.Adams, M.Adams, T.Aguilo, E.Ahn, S. H.Ahsan, M.Alexeev, G. D.Alkhazov, G.Alton, A.Alverson, G.Alves, G. A.Anastasoaie, M.Ancu, L. S.Andeen, T.Anderson, S.Anzelc, M. S.Aoki, M.Arnoud, Y.Arov, M.Arthaud, M.Askew, A.Asman, B.Assis Jesus, A. C. S.Atramentov, O.Avila, C.Ay, C.Badaud, F.Baden, A.Bagby, L.Baldin, B.Bandurin, D. V.Banerjee, P.Banerjee, S.Barberis, E.Barfuss, A. -F.Bargassa, P.Baringer, P.Barreto, J.Bartlett, J. F.Bassler, U.Bauer, D.Beale, S.Bean, A.Begalli, M.Begel, M.Belanger-Champagne, C.Bellantoni, L.Bellavance, A.Benitez, J. A.Beri, S. B.Bernardi, G.Bernhard, R.Bertram, I.Besancon, M.Beuselinck, R.Bezzubov, V. A.Bhat, P. C.Bhatnagar, V.Biscarat, C.Blazey, G.Blekman, F.Blessing, S.Bloch, D.Bloom, K.Boehnlein, A.Boline, D.Bolton, T. A.Boos, E. E.Borissov, G.Bose, T.Brandt, A.Brock, R.Brooijmans, G.Bross, A.Brown, D.Buchanan, N. J.Buchholz, D.Buehler, M.Buescher, V.Bunichev, V.Burdin, S.Burke, S.Burnett, T. H.Buszello, C. P.Butler, J. M.Calfayan, P.Calvet, S.Cammin, J.Carvalho, W.Casey, B. C. K.Castilla-Valdez, H.Chakrabarti, S.Chakraborty, D.Chan, K.Chan, K. M.Chandra, A.Charles, F.Cheu, E.Chevallier, F.Cho, D. K.Choi, S.Choudhary, B.Christofek, L.Christoudias, T.Cihangir, S.Claes, D.Coadou, Y.Cooke, M.Cooper, W. E.Corcoran, M.Couderc, F.Cousinou, M. -C.Crepe-Renaudin, S.Cutts, D.Cwiok, M.da Motta, H.Das, A.Davies, G.De, K.de Jong, S. J.De La Cruz-Burelo, E.Martins, C. De OliveiraDegenhardt, J. D.Deliot, F.Demarteau, M.Demina, R.Denisov, D.Denisov, S. P.Desai, S.Diehl, H. T.Diesburg, M.Dominguez, A.Dong, H.Dudko, L. V.Duflot, L.Dugad, S. R.Duggan, D.Duperrin, A.Dyer, J.Dyshkant, A.Eads, M.Edmunds, D.Ellison, J.Elvira, V. D.Enari, Y.Eno, S.Ermolov, P.Evans, H.Evdokimov, A.Evdokimov, V. N.Ferapontov, A. V.Ferbel, T.Fiedler, F.Filthaut, F.Fisher, W.Fisk, H. E.Fortner, M.Fox, H.Fu, S.Fuess, S.Gadfort, T.Galea, C. F.Gallas, E.Garcia, C.Garcia-Bellido, A.Gavrilov, V.Gay, P.Geist, W.Gele, D.Gerber, C. E.Gershtein, Y.Gillberg, D.Ginther, G.Gollub, N.Gomez, B.Goussiou, A.Grannis, P. D.Greenlee, H.Greenwood, Z. D.Gregores, E. M.Grenier, G.Gris, Ph.Grivaz, J. -F.Grohsjean, A.Gruenendahl, S.Gruenewald, M. W.Guo, F.Guo, J.Gutierrez, G.Gutierrez, P.Haas, A.Hadley, N. J.Haefner, P.Hagopian, S.Haley, J.Hall, I.Hall, R. E.Han, L.Harder, K.Harel, A.Harrington, R.Hauptman, J. M.Hauser, R.Hays, J.Hebbeker, T.Hedin, D.Hegeman, J. G.Heinmiller, J. M.Heinson, A. P.Heintz, U.Hensel, C.Herner, K.Hesketh, G.Hildreth, M. D.Hirosky, R.Hobbs, J. D.Hoeneisen, B.Hoeth, H.Hohlfeld, M.Hong, S. J.Hossain, S.Houben, P.Hu, Y.Hubacek, Z.Hynek, V.Iashvili, I.Illingworth, R.Ito, A. S.Jabeen, S.Jaffre, M.Jain, S.Jakobs, K.Jarvis, C.Jesik, R.Johns, K.Johnson, C.Johnson, M.Jonckheere, A.Jonsson, P.Juste, A.Kajfasz, E.Kalinin, A. M.Kalk, J. M.Kappler, S.Karmanov, D.Kasper, P. A.Katsanos, I.Kau, D.Kaushik, V.Kehoe, R.Kermiche, S.Khalatyan, N.Khanov, A.Kharchilava, A.Kharzheev, Y. M.Khatidze, D.Kim, T. J.Kirby, M. H.Kirsch, M.Klima, B.Kohli, J. M.Konrath, J. -P.Korablev, V. M.Kozelov, A. V.Kraus, J.Krop, D.Kuhl, T.Kumar, A.Kupco, A.Kurca, T.Kvita, J.Lacroix, F.Lam, D.Lammers, S.Landsberg, G.Lebrun, P.Lee, W. M.Leflat, A.Lellouch, J.Leveque, J.Li, J.Li, L.Li, Q. Z.Lietti, M.Lima, J. G. R.Lincoln, D.Linnemann, J.Lipaev, V. V.Lipton, R.Liu, Y.Liu, Z.Lobodenko, A.Lokajicek, M.Love, P.Lubatti, H. J.Luna, R.Lyon, A. L.Maciel, A. K. A.Mackin, D.Madaras, R. J.Maettig, P.Magass, C.Magerkurth, A.Mal, P. K.Malbouisson, H. B.Malik, S.Malyshev, V. L.Mao, H. S.Maravin, Y.Martin, B.McCarthy, R.Melnitchouk, A.Mendoza, L.Mercadante, P. G.Merkin, M.Merritt, K. W.Meyer, A.Meyer, J.Millet, T.Mitrevski, J.Molina, J.Mommsen, R. K.Mondal, N. K.Moore, R. W.Moulik, T.Muanza, G. S.Mulders, M.Mulhearn, M.Mundal, O.Mundim, L.Nagy, E.Naimuddin, M.Narain, M.Naumann, N. A.Neal, H. A.Negret, J. P.Neustroev, P.Nilsen, H.Nogima, H.Novaes, S. F.Nunnemann, T.O'Dell, V.O'Neil, D. C.Obrant, G.Ochando, C.Onoprienko, D.Oshima, N.Osman, N.Osta, J.Otec, R.Otero y Garzon, G. J.Owen, M.Padley, P.Pangilinan, M.Parashar, N.Park, S. -J.Park, S. K.Parsons, J.Partridge, R.Parua, N.Patwa, A.Pawloski, G.Penning, B.Perfilov, M.Peters, K.Peters, Y.Petroff, P.Petteni, M.Piegaia, R.Piper, J.Pleier, M. -A.Podesta-Lerma, P. L. M.Podstavkov, V. M.Pogorelov, Y.Pol, M. -E.Polozov, P.Pope, B. G.Popov, A. V.Potter, C.da Silva, W. L. PradoProsper, H. B.Protopopescu, S.Qian, J.Quadt, A.Quinn, B.Rakitine, A.Rangel, M. S.Ranjan, K.Ratoff, P. N.Renkel, P.Reucroft, S.Rich, P.Rieger, J.Rijssenbeek, M.Ripp-Baudot, I.Rizatdinova, F.Robinson, S.Rodrigues, R. F.Rominsky, M.Royon, C.Rubinov, P.Ruchti, R.Safronov, G.Sajot, G.Sanchez-Hernandez, A.Sanders, M. P.Santoro, A.Savage, G.Sawyer, L.Scanlon, T.Schaile, D.Schamberger, R. D.Scheglov, Y.Schellman, H.Schliephake, T.Schwanenberger, C.Schwartzman, A.Schwienhorst, R.Sekaric, J.Severini, H.Shabalina, E.Shamim, M.Shary, V.Shchukin, A. A.Shivpuri, R. K.Siccardi, V.Simak, V.Sirotenko, V.Skubic, P.Slattery, P.Smirnov, D.Snow, G. R.Snow, J.Snyder, S.Soeldner-Rembold, S.Sonnenschein, L.Sopczak, A.Sosebee, M.Soustruznik, K.Spurlock, B.Stark, J.Steele, J.Stolin, V.Stoyanova, D. A.Strandberg, J.Strandberg, S.Strang, M. A.Strauss, E.Strauss, M.Stroehmer, R.Strom, D.Stutte, L.Sumowidagdo, S.Svoisky, P.Sznajder, A.Tamburello, P.Tanasijczuk, A.Taylor, W.Temple, J.Tiller, B.Tissandier, F.Titov, M.Tokmenin, V. V.Toole, T.Torchiani, I.Trefzger, T.Tsybychev, D.Tuchming, B.Tully, C.Tuts, P. M.Unalan, R.Uvarov, L.Uvarov, S.Uzunyan, S.Vachon, B.van den Berg, P. J.Van Kooten, R.van Leeuwen, W. M.Varelas, N.Varnes, E. W.Vasilyev, I. A.Vaupel, M.Verdier, P.Vertogradov, L. S.Verzocchi, M.Vetterli, M.Villeneuve-Seguier, F.Vint, P.Vokac, P.Von Toerne, E.Voutilainen, M.Wagner, R.Wahl, H. D.Wang, L.Wang, M. H. L. S.Warchol, J.Watts, G.Wayne, M.Weber, G.Weber, M.Welty-Rieger, L.Wenger, A.Wermes, N.Wetstein, M.White, A.Wicke, D.Wilson, G. W.Wimpenny, S. J.Wobisch, M.Wood, D. R.Wyatt, T. R.Xie, Y.Yacoob, S.Yamada, R.Yan, M.Yasuda, T.Yatsunenko, Y. A.Yip, K.Yoo, H. D.Youn, S. W.Yu, J.Zatserklyaniy, A.Zeitnitz, C.Zhao, T.Zhou, B.Zhu, J.Zielinski, M.Zieminska, D.Zieminski, A.Zivkovic, L.Zutshi, V.Zverev, E. G.
Issue Date
7월-2008
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v.78, no.1
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW D
Volume
78
Number
1
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/123326
DOI
10.1103/PhysRevD.78.012005
ISSN
1550-7998
Abstract
We present first evidence for the production of single top quarks in the D0 detector at the Fermilab Tevatron p (p) over bar collider. The standard model predicts that the electroweak interaction can produce a top quark together with an antibottom quark or light quark, without the antiparticle top-quark partner that is always produced from strong-coupling processes. Top quarks were first observed in pair production in 1995, and since then, single top-quark production has been searched for in ever larger data sets. In this analysis, we select events from a 0.9 fb(-1) data set that have an electron or muon and missing transverse energy from the decay of a W boson from the top-quark decay, and two, three, or four jets, with one or two of the jets identified as originating from a b hadron decay. The selected events are mostly backgrounds such as W + jets and t (t) over bar events, which we separate from the expected signals using three multivariate analysis techniques: boosted decision trees, Bayesian neural networks, and matrix-element calculations. A binned likelihood fit of the signal cross section plus background to the data from the combination of the results from the three analysis methods gives a cross section for single top-quark production of sigma(p (p) over bar -> tb + X, tqb + X) = 4.7 +/- 1.3 pb. The probability to measure a cross section at this value or higher in the absence of signal is 0.014%, corresponding to a 3.6 standard deviation significance. The measured cross section value is compatible at the 10% level with the standard model prediction for electroweak top-quark production. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa quark mixing matrix element that describes the Wtb coupling and find vertical bar V(tb)f(1)(L)vertical bar = 1.31(-0.21)(+0.25), where f(1)(L) is a generic vector coupling. This model-independent measurement translates into 0.68 <vertical bar V-tb vertical bar <= 1 at the 95% C.L. in the standard model.
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