Phys. Rev. D
58,
052001
(1998)
[39 pages]
Direct measurement of the top quark mass by the DØ Collaboration
B. Abbott et al. (DØ Collaboration)
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B. Abbott30, M. Abolins27, B. S. Acharya45, I. Adam12, D. L. Adams39, M. Adams17, S. Ahn14, H. Aihara23, G. A. Alves10, N. Amos26, E. W. Anderson19, R. Astur44, M. M. Baarmand44, A. Baden25, V. Balamurali34, J. Balderston16, B. Baldin14, S. Banerjee45, J. Bantly5, E. Barberis23, J. F. Bartlett14, K. Bazizi41, A. Belyaev28, S. B. Beri36, I. Bertram33, V. A. Bezzubov37, P. C. Bhat14, V. Bhatnagar36, M. Bhattacharjee44, N. Biswas34, G. Blazey32, S. Blessing15, P. Bloom7, A. Boehnlein14, N. I. Bojko37, F. Borcherding14, C. Boswell9, A. Brandt14, R. Brock27, A. Bross14, D. Buchholz33, V. S. Burtovoi37, J. M. Butler3, W. Carvalho10, D. Casey41, Z. Casilum44, H. Castilla-Valdez11, D. Chakraborty44, S.-M. Chang31, S. V. Chekulaev37, L.-P. Chen23, W. Chen44, S. Choi43, S. Chopra26, B. C. Choudhary9, J. H. Christenson14, M. Chung17, D. Claes29, A. R. Clark23, W. G. Cobau25, J. Cochran9, L. Coney34, W. E. Cooper14, C. Cretsinger41, D. Cullen-Vidal5, M. A. C. Cummings32, D. Cutts5, O. I. Dahl23, K. Davis2, K. De46, K. Del Signore26, M. Demarteau14, D. Denisov14, S. P. Denisov37, H. T. Diehl14, M. Diesburg14, G. Di Loreto27, P. Draper46, Y. Ducros42, L. V. Dudko28, S. R. Dugad45, D. Edmunds27, J. Ellison9, V. D. Elvira44, R. Engelmann44, S. Eno25, G. Eppley39, P. Ermolov28, O. V. Eroshin37, V. N. Evdokimov37, T. Fahland8, M. K. Fatyga41, S. Feher14, D. Fein2, T. Ferbel41, G. Finocchiaro44, H. E. Fisk14, Y. Fisyak7, E. Flattum14, G. E. Forden2, M. Fortner32, K. C. Frame27, S. Fuess14, E. Gallas46, A. N. Galyaev37, P. Gartung9, T. L. Geld27, R. J. Genik, II,27, K. Genser14, C. E. Gerber14, B. Gibbard4, S. Glenn7, B. Gobbi33, A. Goldschmidt23, B. Gómez1, G. Gómez25, P. I. Goncharov37, J. L. González Solís11, H. Gordon4, L. T. Goss47, K. Gounder9, A. Goussiou44, N. Graf4, P. D. Grannis44, D. R. Green14, H. Greenlee14, G. Grim7, S. Grinstein6, N. Grossman14, P. Grudberg23, S. Grünendahl14, G. Guglielmo35, J. A. Guida2, J. M. Guida5, A. Gupta45, S. N. Gurzhiev37, P. Gutierrez35, Y. E. Gutnikov37, N. J. Hadley25, H. Haggerty14, S. Hagopian15, V. Hagopian15, K. S. Hahn41, R. E. Hall8, P. Hanlet31, S. Hansen14, J. M. Hauptman19, D. Hedin32, A. P. Heinson9, U. Heintz14, R. Hernández-Montoya11, T. Heuring15, R. Hirosky17, J. D. Hobbs14, B. Hoeneisen1,*, J. S. Hoftun5, F. Hsieh26, Ting Hu44, Tong Hu18, T. Huehn9, A. S. Ito14, E. James2, J. Jaques34, S. A. Jerger27, R. Jesik18, J. Z.-Y. Jiang44, T. Joffe-Minor33, K. Johns2, M. Johnson14, A. Jonckheere14, M. Jones16, H. Jöstlein14, S. Y. Jun33, C. K. Jung44, S. Kahn4, G. Kalbfleisch35, J. S. Kang20, D. Karmanov28, D. Karmgard15, R. Kehoe34, M. L. Kelly34, C. L. Kim20, S. K. Kim43, A. Klatchko15, B. Klima14, C. Klopfenstein7, V. I. Klyukhin37, V. I. Kochetkov37, J. M. Kohli36, D. Koltick38, A. V. Kostritskiy37, J. Kotcher4, A. V. Kotwal12, J. Kourlas30, A. V. Kozelov37, E. A. Kozlovski37, J. Krane29, M. R. Krishnaswamy45, S. Krzywdzinski14, S. Kunori25, S. Lami44, R. Lander7, F. Landry27, G. Landsberg14, B. Lauer19, A. Leflat28, H. Li44, J. Li46, Q. Z. Li-Demarteau14, J. G. R. Lima40, D. Lincoln26, S. L. Linn15, J. Linnemann27, R. Lipton14, Y. C. Liu33, F. Lobkowicz41, S. C. Loken23, S. Lökös44, L. Lueking14, A. L. Lyon25, A. K. A. Maciel10, R. J. Madaras23, R. Madden15, L. Magaña-Mendoza11, V. Manankov28, S. Mani7, H. S. Mao14,†, R. Markeloff32, T. Marshall18, M. I. Martin14, K. M. Mauritz19, B. May33, A. A. Mayorov37, R. McCarthy44, J. McDonald15, T. McKibben17, J. McKinley27, T. McMahon35, H. L. Melanson14, M. Merkin28, K. W. Merritt14, H. Miettinen39, A. Mincer30, C. S. Mishra14, N. Mokhov14, N. K. Mondal45, H. E. Montgomery14, P. Mooney1, H. da Motta10, C. Murphy17, F. Nang2, M. Narain14, V. S. Narasimham45, A. Narayanan2, H. A. Neal26, J. P. Negret1, P. Nemethy30, D. Norman47, L. Oesch26, V. Oguri40, E. Oliveira10, E. Oltman23, N. Oshima14, D. Owen27, P. Padley39, A. Para14, Y. M. Park21, R. Partridge5, N. Parua45, M. Paterno41, B. Pawlik22, J. Perkins46, M. Peters16, R. Piegaia6, H. Piekarz15, Y. Pischalnikov38, V. M. Podstavkov37, B. G. Pope27, H. B. Prosper15, S. Protopopescu4, J. Qian26, P. Z. Quintas14, R. Raja14, S. Rajagopalan4, O. Ramirez17, L. Rasmussen44, S. Reucroft31, M. Rijssenbeek44, T. Rockwell27, M. Roco14, N. A. Roe23, P. Rubinov33, R. Ruchti34, J. Rutherfoord2, A. Sánchez-Hernández11, A. Santoro10, L. Sawyer24, R. D. Schamberger44, H. Schellman33, J. Sculli30, E. Shabalina28, C. Shaffer15, H. C. Shankar45, R. K. Shivpuri13, M. Shupe2, H. Singh9, J. B. Singh36, V. Sirotenko32, W. Smart14, E. Smith35, R. P. Smith14, R. Snihur33, G. R. Snow29, J. Snow35, S. Snyder4, J. Solomon17, P. M. Sood36, M. Sosebee46, N. Sotnikova28, M. Souza10, A. L. Spadafora23, G. Steinbrück35, R. W. Stephens46, M. L. Stevenson23, D. Stewart26, F. Stichelbaut44, D. A. Stoianova37, D. Stoker8, M. Strauss35, K. Streets30, M. Strovink23, A. Sznajder10, P. Tamburello25, J. Tarazi8, M. Tartaglia14, T. L. T. Thomas33, J. Thompson25, T. G. Trippe23, P. M. Tuts12, N. Varelas17, E. W. Varnes23, D. Vititoe2, A. A. Volkov37, A. P. Vorobiev37, H. D. Wahl15, G. Wang15, J. Warchol34, G. Watts5, M. Wayne34, H. Weerts27, A. White46, J. T. White47, J. A. Wightman19, S. Willis32, S. J. Wimpenny9, J. V. D. Wirjawan47, J. Womersley14, E. Won41, D. R. Wood31, H. Xu5, R. Yamada14, P. Yamin14, J. Yang30, T. Yasuda31, P. Yepes39, C. Yoshikawa16, S. Youssef15, J. Yu14, Y. Yu43, Z. H. Zhu41, D. Zieminska18, A. Zieminski18, E. G. Zverev28, and A. Zylberstejn42 (DØ Collaboration)
1Universidad de los Andes, Bogotá, Colombia
2University of Arizona, Tucson, Arizona 85721
3Boston University, Boston, Massachusetts 02215
4Brookhaven National Laboratory, Upton, New York 11973
5Brown University, Providence, Rhode Island 02912
6Universidad de Buenos Aires, Buenos Aires, Argentina
7University of California, Davis, California 95616
8University of California, Irvine, California 92697
9University of California, Riverside, California 92521
10LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
11CINVESTAV, Mexico City, Mexico
12Columbia University, New York, New York 10027
13Delhi University, Delhi, India 110007
14Fermi National Accelerator Laboratory, Batavia, Illinois 60510
15Florida State University, Tallahassee, Florida 32306
16University of Hawaii, Honolulu, Hawaii 96822
17University of Illinois at Chicago, Chicago, Illinois 60607
18Indiana University, Bloomington, Indiana 47405
19Iowa State University, Ames, Iowa 50011
20Korea University, Seoul, Korea
21Kyungsung University, Pusan, Korea
22Institute of Nuclear Physics, Kraków, Poland
23Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720
24Louisiana Tech University, Ruston, Louisiana 71272
25University of Maryland, College Park, Maryland 20742
26University of Michigan, Ann Arbor, Michigan 48109
27Michigan State University, East Lansing, Michigan 48824
28Moscow State University, Moscow, Russia
29University of Nebraska, Lincoln, Nebraska 68588
30New York University, New York, New York 10003
31Northeastern University, Boston, Massachusetts 02115
32Northern Illinois University, DeKalb, Illinois 60115
33Northwestern University, Evanston, Illinois 60208
34University of Notre Dame, Notre Dame, Indiana 46556
35University of Oklahoma, Norman, Oklahoma 73019
36University of Panjab, Chandigarh 16-00-14, India
37Institute for High Energy Physics, 142-284 Protvino, Russia
38Purdue University, West Lafayette, Indiana 47907
39Rice University, Houston, Texas 77005
40Universidade do Estado do Rio de Janeiro, Brazil
41University of Rochester, Rochester, New York 14627
42CEA, DAPNIA/Service de Physique des Particules, CE-SACLAY, Gif-sur-Yvette, France
43Seoul National University, Seoul, Korea
44State University of New York, Stony Brook, New York 11794
45Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India
46University of Texas, Arlington, Texas 76019
47Texas A&M University, College Station, Texas 77843
Received 27 January 1998; published 23 July 1998
We determine the top quark mass mt using tt̅ pairs produced in the DØ detector by √s=1.8TeV pp̅ collisions in a 125pb-1 exposure at the Fermilab Tevatron. We make a two constraint fit to mt in tt̅ →bW+b̅ W- final states with one W boson decaying to qq̅ and the other to eν or μν. Likelihood fits to the data yield mt(l+jets)=173.3±5.6 (stat) ± 5.5 (syst) GeV/c2. When this result is combined with an analysis of events in which both W bosons decay into leptons, we obtain mt=172.1±5.2 (stat)±4.9 (syst) GeV/c2. An alternate analysis, using three constraint fits to fixed top quark masses, gives mt(l+jets)=176.0±7.9 (stat)±4.8 (syst) GeV/c2, consistent with the above result. Studies of kinematic distributions of the top quark candidates are also presented. 14.65.Ha, 13.85.Ni, 13.85.Qk
© 1998 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.58.052001
DOI:
10.1103/PhysRevD.58.052001
PACS:
14.65.Ha, 13.85.Ni, 13.85.Qk
*Visitor from Universidad San Francisco de Quito, Quito, Ecuador. †Visitor from IHEP, Beijing, China.
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