Phys. Rev. Lett.
74,
2632–2637
(1995)
Observation of the Top Quark
S. Abachi et al. D0 Collaboration
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S. Abachi12, B. Abbott33, M. Abolins23, B. S. Acharya40, I. Adam10, D. L. Adams34, M. Adams15, S. Ahn12, H. Aihara20, J. Alitti36, G. Álvarez16, G. A. Alves8, E. Amidi27, N. Amos22, E. W. Anderson17, S. H. Aronson3, R. Astur38, R. E. Avery29, A. Baden21, V. Balamurali30, J. Balderston14, B. Baldin12, J. Bantly4, J. F. Bartlett12, K. Bazizi7, J. Bendich20, S. B. Beri31, I. Bertram34, V. A. Bezzubov32, P. C. Bhat12, V. Bhatnagar31, M. Bhattacharjee11, A. Bischoff7, N. Biswas30, G. Blazey12, S. Blessing13, A. Boehnlein12, N. I. Bojko32, F. Borcherding12, J. Borders35, C. Boswell7, A. Brandt12, R. Brock23, A. Bross12, D. Buchholz29, V. S. Burtovoi32, J. M. Butler12, D. Casey35, H. Castilla-Valdez9, D. Chakraborty38, S.-M. Chang27, S. V. Chekulaev32, L.-P. Chen20, W. Chen38, L. Chevalier36, S. Chopra31, B. C. Choudhary7, J. H. Christenson12, M. Chung15, D. Claes38, A. R. Clark20, W. G. Cobau21, J. Cochran7, W. E. Cooper12, C. Cretsinger35, D. Cullen-Vidal4, M. Cummings14, D. Cutts4, O. I. Dahl20, K. De41, M. Demarteau12, R. Demina27, K. Denisenko12, N. Denisenko12, D. Denisov12, S. P. Denisov32, W. Dharmaratna13, H. T. Diehl12, M. Diesburg12, G. Di Loreto23, R. Dixon12, P. Draper41, J. Drinkard6, Y. Ducros36, S. R. Dugad40, S. Durston-Johnson35, D. Edmunds23, A. O. Efimov32, J. Ellison7, V. D. Elvira12,*, R. Engelmann38, S. Eno21, G. Eppley34, P. Ermolov24, O. V. Eroshin32, V. N. Evdokimov32, S. Fahey23, T. Fahland4, M. Fatyga3, M. K. Fatyga35, J. Featherly3, S. Feher38, D. Fein2, T. Ferbel35, G. Finocchiaro38, H. E. Fisk12, Yu. Fisyak24, E. Flattum23, G. E. Forden2, M. Fortner28, K. C. Frame23, P. Franzini10, S. Fredriksen39, S. Fuess12, A. N. Galjaev32, E. Gallas41, C. S. Gao12,†, S. Gao12,‡, T. L. Geld23, R. J. Genik II23, K. Genser12, C. E. Gerber12,§, B. Gibbard3, M. Glaubman27, V. Glebov35, S. Glenn5, J. F. Glicenstein36, B. Gobbi29, M. Goforth13, A. Goldschmidt20, B. Gomez1, P. I. Goncharov32, H. Gordon3, L. T. Goss42, N. Graf3, P. D. Grannis38, D. R. Green12, J. Green28, H. Greenlee12, G. Griffin6, N. Grossman12, P. Grudberg20, S. Grünendahl35, J. A. Guida38, J. M. Guida3, W. Guryn3, S. N. Gurzhiev32, Y. E. Gutnikov32, N. J. Hadley21, H. Haggerty12, S. Hagopian13, V. Hagopian13, K. S. Hahn35, R. E. Hall6, S. Hansen12, R. Hatcher23, J. M. Hauptman17, D. Hedin28, A. P. Heinson7, U. Heintz12, R. Hernandez-Montoya9, T. Heuring13, R. Hirosky13, J. D. Hobbs12, B. Hoeneisen1,**, J. S. Hoftun4, F. Hsieh22, Ting Hu38, Tong Hu16, T. Huehn7, S. Igarashi12, A. S. Ito12, E. James2, J. Jaques30, S. A. Jerger23, J. Z.-Y. Jiang38, T. Joffe-Minor29, H. Johari27, K. Johns2, M. Johnson12, H. Johnstad39, A. Jonckheere12, H. Jöstlein12, S. Y. Jun29, C. K. Jung38, S. Kahn3, J. S. Kang18, R. Kehoe30, M. Kelly30, A. Kernan7, L. Kerth20, C. L. Kim18, S. K. Kim37, A. Klatchko13, B. Klima12, B. I. Klochkov32, C. Klopfenstein38, V. I. Klyukhin32, V. I. Kochetkov32, J. M. Kohli31, D. Koltick33, A. V. Kostritskiy32, J. Kotcher3, J. Kourlas26, A. V. Kozelov32, E. A. Kozlovski32, M. R. Krishnaswamy40, S. Krzywdzinski12, S. Kunori21, S. Lami38, G. Landsberg38, R. E. Lanou4, J-F. Lebrat36, J. Lee-Franzini38, A. Leflat24, H. Li38, J. Li41, Y. K. Li29, Q. Z. Li-Demarteau12, J. G. R. Lima8, D. Lincoln22, S. L. Linn13, J. Linnemann23, R. Lipton12, Y. C. Liu29, F. Lobkowicz35, S. C. Loken20, S. Lökös38, L. Lueking12, A. L. Lyon21, A. K. A. Maciel8, R. J. Madaras20, R. Madden13, I. V. Mandrichenko13, Ph. Mangeot36, S. Mani5, B. Mansoulié36, H. S. Mao12,††, S. Margulies15, R. Markeloff28, L. Markosky2, T. Marshall16, M. I. Martin12, M. Marx38, B. May29, A. A. Mayorov32, R. McCarthy38, T. McKibben15, J. McKinley23, H. L. Melanson12, J. R. T. de Mello Neto8, K. W. Merritt12, H. Miettinen34, A. Milder2, C. Milner39, A. Mincer26, J. M. de Miranda8, C. S. Mishra12, M. Mohammadi-Baarmand38, N. Mokhov12, N. K. Mondal40, H. E. Montgomery12, P. Mooney1, M. Mudan26, C. Murphy16, C. T. Murphy12, F. Nang4, M. Narain12, V. S. Narasimham40, A. Narayanan2, H. A. Neal22, J. P. Negret1, E. Neis22, P. Nemethy26, D. Nešić4, D. Norman42, L. Oesch22, V. Oguri8, E. Oltman20, N. Oshima12, D. Owen23, P. Padley34, M. Pang17, A. Para12, C. H. Park12, Y. M. Park19, R. Partridge4, N. Parua40, M. Paterno35, J. Perkins41, A. Peryshkin12, M. Peters14, H. Piekarz13, Y. Pischalnikov33, A. Pluquet36, V. M. Podstavkov32, B. G. Pope23, H. B. Prosper13, S. Protopopescu3, D. Pušeljić20, J. Qian22, P. Z. Quintas12, R. Raja12, S. Rajagopalan38, O. Ramirez15, M. V. S. Rao40, P. A. Rapidis12, L. Rasmussen38, A. L. Read12, S. Reucroft27, M. Rijssenbeek38, T. Rockwell23, N. A. Roe20, J. M. R. Roldan1, P. Rubinov38, R. Ruchti30, S. Rusin24, J. Rutherfoord2, A. Santoro8, L. Sawyer41, R. D. Schamberger38, H. Schellman29, D. Schmid39, J. Sculli26, E. Shabalina24, C. Shaffer13, H. C. Shankar40, R. K. Shivpuri11, M. Shupe2, J. B. Singh31, V. Sirotenko28, W. Smart12, A. Smith2, R. P. Smith12, R. Snihur29, G. R. Snow25, S. Snyder38, J. Solomon15, P. M. Sood31, M. Sosebee41, M. Souza8, A. L. Spadafora20, R. W. Stephens41, M. L. Stevenson20, D. Stewart22, F. Stocker39, D. A. Stoianova32, D. Stoker6, K. Streets26, M. Strovink20, A. Taketani12, P. Tamburello21, J. Tarazi6, M. Tartaglia12, T. L. Taylor29, J. Teiger36, J. Thompson21, T. G. Trippe20, P. M. Tuts10, N. Varelas23, E. W. Varnes20, P. R. G. Virador20, D. Vititoe20, A. A. Volkov32, E. von Goeler27, A. P. Vorobiev32, H. D. Wahl13, J. Wang12,‡‡, L. Z. Wang12,a, J. Warchol30, M. Wayne30, H. Weerts23, W. A. Wenzel20, A. White41, J. T. White42, J. A. Wightman17, J. Wilcox27, S. Willis28, S. J. Wimpenny7, J. V. D. Wirjawan42, Z. Wolf39, J. Womersley12, E. Won35, D. R. Wood12, H. Xu4, R. Yamada12, P. Yamin3, C. Yanagisawa38, J. Yang26, T. Yasuda27, C. Yoshikawa14, S. Youssef13, J. Yu35, Y. Yu37, Y. Zhang12,b, Y. H. Zhou12,c, Q. Zhu26, Y. S. Zhu12,d, Z. H. Zhu35, D. Zieminska16, A. Zieminski16, A. Zinchenko17, and A. Zylberstejn36 (D0 Collaboration)
1Universidad de los Andes, Bogota, Colombia
2University of Arizona, Tucson, Arizona 85721
3Brookhaven National Laboratory, Upton, New York 11973
4Brown University, Providence, Rhode Island 02912
5University of California, Davis, California 95616
6University of California, Irvine, California 92717
7University of California, Riverside, California 92521
8LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
9Centro de Investigacion y de Estudios Avanzados, Mexico City, Mexico
10Columbia University, New York, New York 10027
11Delhi University, Delhi, India 110007
12Fermi National Accelerator Laboratory, Batavia, Illinois 60510
13Florida State University, Tallahassee, Florida 32306
14University of Hawaii, Honolulu, Hawaii 96822
15University of Illinois, Chicago, Illinois 60680
16Indiana University, Bloomington, Indiana 47405
17Iowa State University, Ames, Iowa 50011
18Korea University, Seoul, Korea
19Kyungsung University, Pusan, Korea
20Lawrence Berkeley Laboratory, Berkeley, California 94720
21University of Maryland, College Park, Maryland 20742
22University of Michigan, Ann Arbor, Michigan 48109
23Michigan State University, East Lansing, Michigan 48824
24Moscow State University, Moscow, Russia
25University of Nebraska, Lincoln, Nebraska 68588
26New York University, New York, New York 10003
27Northeastern University, Boston, Massachusetts 02115
28Northern Illinois University, DeKalb, Illinois 60115
29Northwestern University, Evanston, Illinois 60208
30University of Notre Dame, Notre Dame, Indiana 46556
31University of Panjab, Chandigarh 16-00-14, India
32Institute for High Energy Physics, 142-284 Protvino, Russia
33Purdue University, West Lafayette, Indiana 47907
34Rice University, Houston, Texas 77251
35University of Rochester, Rochester, New York 14627
36Commissariat à l'Energie Atomique, DAPNIA/Service de Physique des Particules, Centre d'Etudes de Saclay, Saclay, France
37Seoul National University, Seoul, Korea
38State University of New York, Stony Brook, New York 11794
39Superconducting Super Collider Laboratory, Dallas, Texas 75237
40Tata Institute of Fundamental Research, Colaba, Bombay 400005, India
41University of Texas, Arlington, Texas 76019
42Texas A&M University, College Station, Texas 77843
Received 24 February 1995; published in the issue dated 3 April 1995
The D0 Collaboration reports on a search for the standard model top quark in pp̅ collisions at √s = 1.8 TeV at the Fermilab Tevatron with an integrated luminosity of approximately 50 pb-1. We have searched for tt̅ production in the dilepton and single-lepton decay channels with and without tagging of b-quark jets. We observed 17 events with an expected background of 3.8±0.6 events. The probability for an upward fluctuation of the background to produce the observed signal is 2×10-6 (equivalent to 4.6 standard deviations). The kinematic properties of the excess events are consistent with top quark decay. We conclude that we have observed the top quark and measured its mass to be 199-21+19 (stat) ±22 (syst) GeV/c2 and its production cross section to be 6.4±2.2 pb.
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.2632
DOI:
10.1103/PhysRevLett.74.2632
PACS:
14.65.Ha, 13.85.Qk, 13.85.Ni
*Visitor from CONICET, Argentina. †Visitor from IHEP, Beijing, China. ‡Visitor from IHEP, Beijing, China. §Visitor from Universidad de Buenos Aires, Argentina. **Visitor from University San Francisco de Quito, Ecuador. †† ‡‡ a b c d
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