Phys. Rev. Lett. 79, 4321 - 4326 (1997)
Search for Scalar Leptoquark Pairs Decaying to Electrons and Jets in p̅ p Collisions
B. Abbott et al. (D0 Collaboration)
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B. Abbott28, M. Abolins25, B. S. Acharya43, I. Adam12, D. L. Adams37, M. Adams17, S. Ahn14, H. Aihara22, G. A. Alves10, E. Amidi29, N. Amos24, E. W. Anderson19, R. Astur42, M. M. Baarmand42, A. Baden23, V. Balamurali32, J. Balderston16, B. Baldin14, S. Banerjee43, J. Bantly5, J. F. Bartlett14, K. Bazizi39, A. Belyaev26, S. B. Beri34, I. Bertram31, V. A. Bezzubov35, P. C. Bhat14, V. Bhatnagar34, M. Bhattacharjee13, N. Biswas32, G. Blazey30, S. Blessing15, P. Bloom7, A. Boehnlein14, N. I. Bojko35, F. Borcherding14, C. Boswell9, A. Brandt14, R. Brock25, A. Bross14, D. Buchholz31, V. S. Burtovoi35, J. M. Butler3, W. Carvalho10, D. Casey39, Z. Casilum42, H. Castilla-Valdez11, D. Chakraborty42, S.-M. Chang29, S. V. Chekulaev35, L.-P. Chen22, W. Chen42, S. Choi41, S. Chopra24, B. C. Choudhary9, J. H. Christenson14, M. Chung17, D. Claes27, 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. Davis2, K. De44, K. Del Signore24, M. Demarteau14, D. Denisov14, S. P. Denisov35, H. T. Diehl14, M. Diesburg14, G. Di Loreto25, P. Draper44, Y. Ducros40, L. V. Dudko26, S. R. Dugad43, D. Edmunds25, J. Ellison9, V. D. Elvira42, R. Engelmann42, S. Eno23, G. Eppley37, P. Ermolov26, O. V. Eroshin35, V. N. Evdokimov35, T. Fahland8, M. Fatyga4, M. K. Fatyga39, J. Featherly4, S. Feher14, D. Fein2, T. Ferbel39, G. Finocchiaro42, H. E. Fisk14, Y. Fisyak7, E. Flattum14, G. E. Forden2, M. Fortner30, K. C. Frame25, S. Fuess14, E. Gallas44, A. N. Galyaev35, P. Gartung9, T. L. Geld25, R. J. Genik, II25, K. Genser14, C. E. Gerber14, B. Gibbard4, S. Glenn7, B. Gobbi31, M. Goforth15, A. Goldschmidt22, B. Gómez1, G. Gómez23, P. I. Goncharov35, J. L. González Solís11, H. Gordon4, L. T. Goss45, K. Gounder9, A. Goussiou42, N. Graf4, P. D. Grannis42, D. R. Green14, J. Green30, H. Greenlee14, G. Grim7, S. Grinstein6, N. Grossman14, P. Grudberg22, S. Grünendahl39, G. Guglielmo33, J. A. Guida2, J. M. Guida5, A. Gupta43, S. N. Gurzhiev35, P. Gutierrez33, Y. E. Gutnikov35, N. J. Hadley23, H. Haggerty14, S. Hagopian15, V. Hagopian15, K. S. Hahn39, R. E. Hall8, P. Hanlet29, S. Hansen14, 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, Ting Hu42, Tong Hu18, T. Huehn9, A. S. Ito14, E. James2, J. Jaques32, S. A. Jerger25, R. Jesik18, J. Z.-Y. Jiang42, T. Joffe-Minor31, K. Johns2, M. Johnson14, A. Jonckheere14, M. Jones16, H. Jöstlein14, S. Y. Jun31, C. K. Jung42, S. Kahn4, G. Kalbfleisch33, J. S. Kang20, D. Karmgard15, R. Kehoe32, M. L. Kelly32, C. L. Kim20, S. K. Kim41, A. Klatchko15, B. Klima14, C. Klopfenstein7, V. I. Klyukhin35, V. I. Kochetkov35, J. M. Kohli34, D. Koltick36, A. V. Kostritskiy35, J. Kotcher4, A. V. Kotwal12, J. Kourlas28, A. V. Kozelov35, E. A. Kozlovski35, J. Krane27, M. R. Krishnaswamy43, S. Krzywdzinski14, S. Kunori42, S. Lami42, H. Lan14, R. Lander7, F. Landry25, G. Landsberg14, B. Lauer19, A. Leflat26, H. Li42, J. Li44, Q. Z. Li-Demarteau14, J. G. R. Lima38, D. Lincoln24, S. L. Linn15, J. Linnemann25, R. Lipton14, Q. Liu14, Y. C. Liu31, F. Lobkowicz39, S. C. Loken22, S. Lökös42, L. Lueking14, A. L. Lyon23, A. K. A. Maciel10, R. J. Madaras22, R. Madden15, L. Magaña-Mendoza11, S. Mani7, H. S. Mao14, R. Markeloff30, T. Marshall18, M. I. Martin14, K. M. Mauritz19, B. May31, A. A. Mayorov35, R. McCarthy42, J. McDonald15, T. McKibben17, J. McKinley25, T. McMahon33, H. L. Melanson14, M. Merkin26, K. W. Merritt14, H. Miettinen37, A. Mincer28, C. S. Mishra14, N. Mokhov14, N. K. Mondal43, H. E. Montgomery14, P. Mooney1, H. da Motta10, C. Murphy17, F. Nang2, M. Narain14, V. S. Narasimham43, A. Narayanan2, H. A. Neal24, J. P. Negret1, P. Nemethy28, M. Nicola10, D. Norman45, L. Oesch24, V. Oguri38, E. Oltman22, N. Oshima14, D. Owen25, P. Padley37, M. Pang19, A. Para14, Y. M. Park21, R. Partridge5, N. Parua43, M. Paterno39, J. Perkins44, M. Peters16, R. Piegaia6, H. Piekarz15, Y. Pischalnikov36, V. M. Podstavkov35, B. G. Pope25, H. B. Prosper15, S. Protopopescu4, J. Qian24, P. Z. Quintas14, R. Raja14, S. Rajagopalan4, O. Ramirez17, L. Rasmussen42, S. Reucroft29, M. Rijssenbeek42, T. Rockwell25, N. A. Roe22, P. Rubinov31, R. Ruchti32, J. Rutherfoord2, A. Sánchez-Hernández11, A. Santoro10, L. Sawyer44, R. D. Schamberger42, H. Schellman31, J. Sculli28, E. Shabalina26, C. Shaffer15, H. C. Shankar43, R. K. Shivpuri13, M. Shupe2, H. Singh9, J. B. Singh34, V. Sirotenko30, W. Smart14, R. P. Smith14, R. Snihur31, G. R. Snow27, J. Snow33, S. Snyder4, J. Solomon17, P. M. Sood34, M. Sosebee44, N. Sotnikova26, M. Souza10, A. L. Spadafora22, R. W. Stephens44, M. L. Stevenson22, D. Stewart24, F. Stichelbaut42, D. A. Stoianova35, D. Stoker8, M. Strauss33, K. Streets28, M. Strovink22, A. Sznajder10, P. Tamburello23, J. Tarazi8, M. Tartaglia14, T. L. T. Thomas31, J. Thompson23, T. G. Trippe22, P. M. Tuts12, N. Varelas25, E. W. Varnes22, D. Vititoe2, A. A. Volkov35, A. P. Vorobiev35, H. D. Wahl15, G. Wang15, J. Warchol32, G. Watts5, M. Wayne32, H. Weerts25, A. White44, J. T. White45, J. A. Wightman19, S. Willis30, S. J. Wimpenny9, J. V. D. Wirjawan45, J. Womersley14, E. Won39, D. R. Wood29, H. Xu5, R. Yamada14, P. Yamin4, C. Yanagisawa42, J. Yang28, T. Yasuda29, P. Yepes37, C. Yoshikawa16, S. Youssef15, J. Yu14, Y. Yu14, Z. H. Zhu39, D. Zieminska18, A. Zieminski18, E. G. Zverev26, and A. Zylberstejn40 (D0 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
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 77005
38Universidade do Estado do Rio de Janeiro, Brazil
39University of Rochester, Rochester, New York 14627
40CEA, DAPNIA/Service de Physique des Particules, CE-SACLAY, Gif-sur-Yvette, France
41Seoul National University, Seoul, Korea
42State University of New York, Stony Brook, New York 11794
43Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India
44University of Texas, Arlington, Texas 76019
45Texas A&M University, College Station, Texas 77843
Received 21 July 1997
We have searched for the pair production of first generation scalar leptoquarks in the eejj channel using the full data set (123 pb-1) collected with the D0 detector at the Fermilab Tevatron during 1992–1996. We observe no candidates with an expected background of approximately 0.4 events. Comparing the experimental 95% confidence level upper limit to theoretical calculations of the cross section with the assumption of a 100% branching fraction of eq, we set a lower limit on the mass of a first generation scalar leptoquark of 225 GeV/c2. The results of this analysis rule out the interpretation of the excess of high Q2 events at DESY HERA as leptoquarks which decay exclusively to eq.
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v79/p4321
DOI: 10.1103/PhysRevLett.79.4321
PACS: 14.80.-j, 13.85.Rm
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