Phys. Rev. Lett.
76,
2222–2227
(1996)
Search for Light Top Squarks in pp̅ Collisions at √s = 1.8 TeV
S. Abachi et al. (D0 Collaboration)
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S. Abachi14, B. Abbott28, M. Abolins25, B. S. Acharya44, I. Adam12, D. L. Adams37, M. Adams17, S. Ahn14, H. Aihara22, J. Alitti40, G. Álvarez18, G. A. Alves10, E. Amidi29, N. Amos24, E. W. Anderson19, S. H. Aronson4, R. Astur42, R. E. Avery31, A. Baden23, V. Balamurali32, J. Balderston16, B. Baldin14, J. Bantly5, J. F. Bartlett14, K. Bazizi39, J. Bendich22, S. B. Beri34, I. Bertram37, V. A. Bezzubov35, P. C. Bhat14, V. Bhatnagar34, M. Bhattacharjee13, A. Bischoff9, N. Biswas32, G. Blazey14, S. Blessing15, P. Bloom7, A. Boehnlein14, N. I. Bojko35, F. Borcherding14, J. Borders39, C. Boswell9, A. Brandt14, R. Brock25, A. Bross14, D. Buchholz31, V. S. Burtovoi35, J. M. Butler3, W. Carvalho10, D. Casey39, H. Castilla-Valdez11, D. Chakraborty42, S.-M. Chang29, S. V. Chekulaev35, L.-P. Chen22, W. Chen42, S. Chopra34, B. C. Choudhary9, J. H. Christenson14, M. Chung17, D. Claes42, A. R. Clark22, W. G. Cobau23, J. Cochran9, W. E. Cooper14, C. Cretsinger39, D. Cullen-Vidal5, M. A. C. Cummings16, D. Cutts5, O. I. Dahl22, K. De45, M. Demarteau14, R. Demina29, K. Denisenko14, N. Denisenko14, D. Denisov14, S. P. Denisov35, H. T. Diehl14, M. Diesburg14, G. Di Loreto25, R. Dixon14, P. Draper45, J. Drinkard8, Y. Ducros40, S. R. Dugad44, S. Durston-Johnson39, D. Edmunds25, J. Ellison9, V. D. Elvira6, R. Engelmann42, S. Eno23, G. Eppley37, P. Ermolov26, O. V. Eroshin35, V. N. Evdokimov35, S. Fahey25, T. Fahland5, M. Fatyga4, M. K. Fatyga39, J. Featherly4, S. Feher42, D. Fein2, T. Ferbel39, G. Finocchiaro42, H. E. Fisk14, Y. Fisyak7, E. Flattum25, G. E. Forden2, M. Fortner30, K. C. Frame25, P. Franzini12, S. Fuess14, E. Gallas45, A. N. Galyaev35, T. L. Geld25, R. J. Genik II25, K. Genser14, C. E. Gerber6, B. Gibbard4, V. Glebov39, S. Glenn7, J. F. Glicenstein40, B. Gobbi31, M. Goforth15, A. Goldschmidt22, B. Gómez1, P. I. Goncharov35, J. L. González Solís11, H. Gordon4, L. T. Goss46, N. Graf4, P. D. Grannis42, D. R. Green14, J. Green30, H. Greenlee14, G. Griffin8, N. Grossman14, P. Grudberg22, S. Grünendahl39, W. X. Gu14, G. Guglielmo33, J. A. Guida2, J. M. Guida4, W. Guryn4, S. N. Gurzhiev35, P. Gutierrez33, Y. E. Gutnikov35, N. J. Hadley23, H. Haggerty14, S. Hagopian15, V. Hagopian15, K. S. Hahn39, R. E. Hall8, S. Hansen14, R. Hatcher25, J. M. Hauptman19, D. Hedin30, A. P. Heinson9, U. Heintz14, R. Hernández-Montoya11, T. Heuring15, R. Hirosky15, J. D. Hobbs14, B. Hoeneisen1, J. S. Hoftun5, F. Hsieh24, Tao Hu14, Ting Hu42, Tong Hu18, T. Huehn9, S. Igarashi14, A. S. Ito14, E. James2, J. Jaques32, S. A. Jerger25, J. Z.-Y. Jiang42, T. Joffe-Minor31, H. Johari29, K. Johns2, M. Johnson14, H. Johnstad43, A. Jonckheere14, M. Jones16, H. Jöstlein14, S. Y. Jun31, C. K. Jung42, S. Kahn4, G. Kalbfleisch33, J. S. Kang20, R. Kehoe32, M. L. Kelly32, A. Kernan9, L. Kerth22, C. L. Kim20, S. K. Kim41, A. Klatchko15, B. Klima14, B. I. Klochkov35, C. Klopfenstein7, V. I. Klyukhin35, V. I. Kochetkov35, J. M. Kohli34, D. Koltick36, A. V. Kostritskiy35, J. Kotcher4, J. Kourlas28, A. V. Kozelov35, E. A. Kozlovski35, M. R. Krishnaswamy44, S. Krzywdzinski14, S. Kunori23, S. Lami42, G. Landsberg14, J-F. Lebrat40, A. Leflat26, H. Li42, J. Li45, Y. K. Li31, Q. Z. Li-Demarteau14, J. G. R. Lima38, D. Lincoln24, S. L. Linn15, J. Linnemann25, R. Lipton14, Y. C. Liu31, F. Lobkowicz39, S. C. Loken22, S. Lökös42, L. Lueking14, A. L. Lyon23, A. K. A. Maciel10, R. J. Madaras22, R. Madden15, S. Mani7, H. S. Mao14, S. Margulies17, R. Markeloff30, L. Markosky2, T. Marshall18, M. I. Martin14, M. Marx42, B. May31, A. A. Mayorov35, R. McCarthy42, T. McKibben17, J. McKinley25, T. McMahon33, H. L. Melanson14, J. R. T. de Mello Neto38, K. W. Merritt14, H. Miettinen37, A. Mincer28, J. M. de Miranda10, C. S. Mishra14, M. Mohammadi-Baarmand42, N. Mokhov14, N. K. Mondal44, H. E. Montgomery14, P. Mooney1, H. da Motta10, M. Mudan28, C. Murphy18, C. T. Murphy14, F. Nang5, M. Narain14, V. S. Narasimham44, A. Narayanan2, H. A. Neal24, J. P. Negret1, E. Neis24, P. Nemethy28, D. Nešić5, M. Nicola10, D. Norman46, L. Oesch24, V. Oguri38, E. Oltman22, N. Oshima14, D. Owen25, P. Padley37, M. Pang19, A. Para14, C. H. Park14, Y. M. Park21, R. Partridge5, N. Parua44, M. Paterno39, J. Perkins45, A. Peryshkin14, M. Peters16, H. Piekarz15, Y. Pischalnikov36, V. M. Podstavkov35, B. G. Pope25, H. B. Prosper15, S. Protopopescu4, D. Pušeljić22, J. Qian24, P. Z. Quintas14, R. Raja14, S. Rajagopalan42, O. Ramirez17, M. V. S. Rao44, P. A. Rapidis14, L. Rasmussen42, A. L. Read14, S. Reucroft29, M. Rijssenbeek42, T. Rockwell25, N. A. Roe22, P. Rubinov31, R. Ruchti32, S. Rusin26, J. Rutherfoord2, A. Santoro10, L. Sawyer45, R. D. Schamberger42, H. Schellman31, J. Sculli28, E. Shabalina26, C. Shaffer15, H. C. Shankar44, Y. Y. Shao14, R. K. Shivpuri13, M. Shupe2, J. B. Singh34, V. Sirotenko30, W. Smart14, A. Smith2, R. P. Smith14, R. Snihur31, G. R. Snow27, S. Snyder4, J. Solomon17, P. M. Sood34, M. Sosebee45, M. Souza10, A. L. Spadafora22, R. W. Stephens45, M. L. Stevenson22, D. Stewart24, D. A. Stoianova35, D. Stocker8, K. Streets28, M. Strovink22, A. Sznajder10, A. Taketani14, P. Tamburello23, J. Tarazi8, M. Tartaglia14, T. L. Taylor31, J. Thompson23, T. G. Trippe22, P. M. Tuts12, N. Varelas25, E. W. Varnes22, P. R. G. Virador22, D. Vititoe2, A. A. Volkov35, A. P. Vorobiev35, H. D. Wahl15, G. Wang15, J. Warchol32, M. Wayne32, H. Weerts25, F. Wen15, A. White45, J. T. White46, J. A. Wightman19, J. Wilcox29, S. Willis30, S. J. Wimpenny9, J. V. D. Wirjawan46, J. Womersley14, E. Won39, D. R. Wood14, H. Xu5, R. Yamada14, P. Yamin4, C. Yanagisawa42, J. Yang28, T. Yasuda29, C. Yoshikawa16, S. Youssef15, J. Yu39, Y. Yu41, D. H. Zhang14, Q. Zhu28, Z. H. Zhu39, D. Zieminska18, A. Zieminski18, and A. Zylberstejn40 (D0 Collaboration)
1Universidad de los Andes, Bogota, 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 92717
9University of California, Riverside, California 92521
10LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
11Centro de Investigacion y de Estudios Avanzados, 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
22Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720
23University of Maryland, College Park, Maryland 20742
24University of Michigan, Ann Arbor, Michigan 48109
25Michigan State University, East Lansing, Michigan 48824
26Moscow State University, Moscow, Russia
27University of Nebraska, Lincoln, Nebraska 68588
28New York University, New York, New York 10003
29Northeastern University, Boston, Massachusetts 02115
30Northern Illinois University, DeKalb, Illinois 60115
31Northwestern University, Evanston, Illinois 60208
32University of Notre Dame, Notre Dame, Indiana 46556
33University of Oklahoma, Norman, Oklahoma 73019
34University of Panjab, Chandigarh 16-00-14, India
35Institute for High Energy Physics, 142-284 Protvino, Russia
36Purdue University, West Lafayette, Indiana 47907
37Rice University, Houston, Texas 77251
38Universidade Estadual do Rio de Janeiro, Rio de Janeiro, Brazil
39University of Rochester, Rochester, New York 14627
40Commissariat à l'Energie Atomique, DAPNIA/Service de Physique des Particules, Centre d'Etudes de Saclay, Saclay, France
41Seoul National University, Seoul, Korea
42State University of New York, Stony Brook, New York 11794
43Superconducting Super Collider Laboratory, Dallas, Texas 75237
44Tata Institute of Fundamental Research, Colaba, Bombay 400005, India
45University of Texas, Arlington, Texas 76019
46Texas A&M University, College Station, Texas 77843
Received 30 November 1995; published in the issue dated 25 March 1996
We present a search for pair produced top squarks, the supersymmetric partners of the top quark, using the D0 detector at the Fermilab Tevatron pp̅ collider. We consider a scenario in which the lighter of the two top squarks t̃1 decays with 100% branching fraction to a charm quark and the lightest neutralino χ̃10 yielding a signal of two acollinear jets with missing transverse energy. We observe 3 events while we expect 3.5±1.2 events from the known standard model processes. We exclude at the 95% confidence level a significant region of the mt̃1- mχ̃10 parameter space. The highest mt̃1 value we exclude is 93 GeV/c2 with a corresponding mχ̃10 value of 8 GeV/c2.
© 1996 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.2222
DOI:
10.1103/PhysRevLett.76.2222
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