Phys. Rev. D
50,
2966–3026
(1994)
Evidence for top quark production in p¯p collisions at √s =1.8 TeV
F. Abe et al.
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F. Abe, M. G. Albrow, S. R. Amendolia, D. Amidei, J. Antos, C. Anway-Wiese, G. Apollinari, H. Areti, P. Auchincloss, M. Austern, F. Azfar, P. Azzi, N. Bacchetta, W. Badgett, M. W. Bailey, J. Bao, P. de Barbaro, A. Barbaro-Galtieri, V. E. Barnes, B. A. Barnett, P. Bartalini, G. Bauer, T. Baumann, F. Bedeschi, S. Behrends, S. Belforte, G. Bellettini, J. Bellinger, D. Benjamin, J. Benlloch, J. Bensinger, D. Benton, A. Beretvas, J. P. Berge, S. Bertolucci, A. Bhatti, K. Biery, M. Binkley, F. Bird, D. Bisello, R. E. Blair, C. Blocker, A. Bodek, V. Bolognesi, D. Bortoletto, C. Boswell, T. Boulos, G. Brandenburg, E. Buckley-Geer, H. S. Budd, K. Burkett, G. Busetto, A. Byon-Wagner, K. L. Byrum, C. Campagnari, M. Campbell, A. Caner, W. Carithers, D. Carlsmith, A. Castro, Y. Cen, F. Cervelli, J. Chapman, M.-T. Cheng, G. Chiarelli, T. Chikamatsu, S. Cihangir, A. G. Clark, M. Cobal, M. Contreras, J. Conway, J. Cooper, M. Cordelli, D. P. Coupal, D. Crane, J. D. Cunningham, T. Daniels, F. DeJongh, S. Delchamps, S. Dell’Agnello, M. Dell’Orso, L. Demortier, B. Denby, M. Deninno, P. F. Derwent, T. Devlin, M. Dickson, S. Donati, R. B. Drucker, A. Dunn, K. Einsweiler, J. E. Elias, R. Ely, E. Engels, Jr., S. Eno, D. Errede, S. Errede, Q. Fan, B. Farhat, I. Fiori, B. Flaugher, G. W. Foster, M. Franklin, M. Frautschi, J. Freeman, J. Friedman, H. Frisch, A. Fry, T. A. Fuess, Y. Fukui, S. Funaki, G. Gagliardi, S. Galeotti, M. Gallinaro, A. F. Garfinkel, S. Geer, D. W. Gerdes, P. Giannetti, N. Giokaris, P. Giromini, L. Gladney, D. Glenzinski, M. Gold, J. Gonzalez, A. Gordon, A. T. Goshaw, K. Goulianos, H. Grassmann, A. Grewal, G. Grieco, L. Groer, C. Grosso-Pilcher, C. Haber, S. R. Hahn, R. Hamilton, R. Handler, R. M. Hans, K. Hara, B. Harral, R. M. Harris, S. A. Hauger, J. Hauser, C. Hawk, J. Heinrich, D. Hennessy, R. Hollebeek, L. Holloway, A. Hölscher, S. Hong, G. Houk, P. Hu, B. T. Huffman, R. Hughes, P. Hurst, J. Huston, J. Huth, J. Hylen, M. Incagli, J. Incandela, H. Iso, H. Jensen, C. P. Jessop, U. Joshi, R. W. Kadel, E. Kajfasz, T. Kamon, T. Kaneko, D. A. Kardelis, H. Kasha, Y. Kato, L. Keeble, R. D. Kennedy, R. Kephart, P. Kesten, D. Kestenbaum, R. M. Keup, H. Keutelian, F. Keyvan, D. H. Kim, H. S. Kim, S. B. Kim, S. H. Kim, Y. K. Kim, L. Kirsch, P. Koehn, K. Kondo, J. Konigsberg, S. Kopp, K. Kordas, W. Koska, E. Kovacs, W. Kowald, M. Krasberg, J. Kroll, M. Kruse, S. E. Kuhlmann, E. Kuns, A. T. Laasanen, S. Lammel, J. I. Lamoureux, T. LeCompte, S. Leone, J. D. Lewis, P. Limon, M. Lindgren, T. M. Liss, N. Lockyer, O. Long, M. Loreti, E. H. Low, J. Lu, D. Lucchesi, C. B. Luchini, P. Lukens, J. Lys, P. Maas, K. Maeshima, A. Maghakian, P. Maksimovic, M. Mangano, J. Mansour, M. Mariotti, J. P. Marriner, A. Martin, J. A. J. Matthews, R. Mattingly, P. McIntyre, P. Melese, A. Menzione, E. Meschi, G. Michail, S. Mikamo, M. Miller, R. Miller, T. Mimashi, S. Miscetti, M. Mishina, H. Mitsushio, S. Miyashita, Y. Morita, S. Moulding, J. Mueller, A. Mukherjee, T. Muller, P. Musgrave, L. F. Nakae, I. Nakano, C. Nelson, D. Neuberger, C. Newman-Holmes, L. Nodulman, S. Ogawa, S. H. Oh, K. E. Ohl, R. Oishi, T. Okusawa, C. Pagliarone, R. Paoletti, V. Papadimitriou, S. Park, J. Patrick, G. Pauletta, M. Paulini, L. Pescara, M. D. Peters, T. J. Phillips, G. Piacentino, M. Pillai, R. Plunkett, L. Pondrom, N. Produit, J. Proudfoot, F. Ptohos, G. Punzi, K. Ragan, F. Rimondi, L. Ristori, M. Roach-Bellino, W. J. Robertson, T. Rodrigo, J. Romano, L. Rosenson, W. K. Sakumoto, D. Saltzberg, A. Sansoni, V. Scarpine, A. Schindler, P. Schlabach, E. E. Schmidt, M. P. Schmidt, O. Schneider, G. F. Sciacca, A. Scribano, S. Segler, S. Seidel, Y. Seiya, G. Sganos, A. Sgolacchia, M. Shapiro, N. M. Shaw, Q. Shen, P. F. Shepard, M. Shimojima, M. Shochet, J. Siegrist, A. Sill, P. Sinervo, P. Singh, J. Skarha, K. Sliwa, D. A. Smith, F. D. Snider, L. Song, T. Song, J. Spalding, L. Spiegel, P. Sphicas, A. Spies, L. Stanco, J. Steele, A. Stefanini, K. Strahl, J. Strait, D. Stuart, G. Sullivan, K. Sumorok, R. L. Swartz, Jr., T. Takahashi, K. Takikawa, F. Tartarelli, W. Taylor, Y. Teramoto, S. Tether, D. Theriot, J. Thomas, T. L. Thomas, R. Thun, M. Timko, P. Tipton, A. Titov, S. Tkaczyk, K. Tollefson, A. Tollestrup, J. Tonnison, J. F. de Troconiz, J. Tseng, M. Turcotte, N. Turini, N. Uemura, F. Ukegawa, G. Unal, S. van den Brink, S. Vejcik, III, R. Vidal, M. Vondracek, R. G. Wagner, R. L. Wagner, N. Wainer, R. C. Walker, G. Wang, J. Wang, M. J. Wang, Q. F. Wang, A. Warburton, G. Watts, T. Watts, R. Webb, C. Wendt, H. Wenzel, W. C. Wester, III, T. Westhusing, A. B. Wicklund, R. Wilkinson, H. H. Williams, P. Wilson, B. L. Winer, J. Wolinski, D. Y. Wu, X. Wu, J. Wyss, A. Yagil, W. Yao, K. Yasuoka, Y. Ye, G. P. Yeh, P. Yeh, M. Yin, J. Yoh, T. Yoshida, D. Yovanovitch, I. Yu, J. C. Yun, A. Zanetti, F. Zetti, L. Zhang, S. Zhang, W. Zhang, and S. Zucchelli
Argonne National Laboratory, Argonne, Illinois 60439
Brandeis University, Waltham, Massachusetts 02254
Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40126 Bologna, Italy
University of California at Los Angeles, Los Angeles, California 90024
University of Chicago, Chicago, Illinois 60637
Duke University, Durham, North Carolina 27708
Fermi National Accelerator Laboratory, Batavia, Illinois 60510
Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
Harvard University, Cambridge, Massachusetts 02138
University of Illinois, Urbana, Illinois 61801
Institute of Particle Physics, McGill University, Montreal, Quebec, Canada H3A 2T8
University of Toronto, Toronto, Ontario, Canada M5S 1A7
The Johns Hopkins University, Baltimore, Maryland 21218
National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305, Japan
Lawrence Berkeley Laboratory, Berkeley, California 94720
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
University of Michigan, Ann Arbor, Michigan 48109
Michigan State University, East Lansing, Michigan 48824
University of New Mexico, Albuquerque, New Mexico 87131
Osaka City University, Osaka 588, Japan
Universita di Padova, Instituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
University of Pennsylvania, Philadelphia, Pennsylvania 19104
University of Pittsburgh, Pittsburgh, Pennsylvania 15260
Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
Purdue University, West Lafayette, Indiana 47907
University of Rochester, Rochester, New York 14627
Rockefeller University, New York, New York 10021
Rutgers University, Piscataway, New Jersey 08854
Academia Sinica, Taiwan 11529, Republic of China
Superconducting Super Collider Laboratory, Dallas, Texas 75237
Texas A&M University, College Station, Texas 77843
University of Tsukuba, Tsukuba, Ibaraki 305, Japan
Tufts University, Medford, Massachusetts 02155
University of Wisconsin, Madison, Wisconsin 53706
Yale University, New Haven, Connecticut 06511
Received 25 April 1994; published in the issue dated 1 September 1994
We present the results of a search for the top quark in 19.3 pb-1 of p¯p collisions at √s =1.8 TeV. The data were collected at the Fermilab Tevatron collider using the Collider Detector at Fermilab (CDF). The search includes standard model tt¯ decays to final states eeνν¯, eμνν¯, and μμνν¯ as well as e+ν+jets or μ+ν+jets. In the (e,μ)+ν+jets channel we search for b quarks from t decays via secondary vertex identification and via semileptonic decays of the b and cascade c quarks. In the dilepton final states we find two events with a background of 0.56-0.13+0.25 events. In the e,μ+ν+jets channel with a b identified via a secondary vertex, we find six events with a background of 2.3±0.3. With a b identified via a semileptonic decay, we find seven events with a background of 3.1±0.3. The secondary vertex and semileptonic-decay samples have three events in common. The probability that the observed yield is consistent with the background is estimated to be 0.26%. The statistics are too limited to firmly establish the existence of the top quark; however, a natural interpretation of the excess is that it is due to tt¯ production. We present several cross-checks. Some support this hypothesis; others do not. Under the assumption that the excess yield over background is due to tt¯, constrained fitting on a subset of the events yields a mass of 174±10-12+13 GeV/c2 for the top quark. The tt¯ cross section, using this top quark mass to compute the acceptance, is measured to be 13.9-4.8+6.1 pb.
© 1994 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.50.2966
DOI:
10.1103/PhysRevD.50.2966
PACS:
14.65.Ha, 13.85.Ni, 13.85.Qk
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