Phys. Rev. Lett.
80,
2051–2056
(1998)
Search for First Generation Scalar Leptoquark Pairs in pp̅ Collisions at √s = 1.8 TeV
B. Abbott et al. (D0 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, II27, K. Genser14, C. E. Gerber14, B. Gibbard4, S. Glenn7, B. Gobbi33, M. Goforth15, 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. Hirosky15, 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, B. Knuteson23, 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, S. Mani7, V. Manankov28, 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. 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, 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. Steinbrueck35, 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. Yamin4, 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 (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
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 30 October 1997; published in the issue dated 9 March 1998
We have searched for first generation scalar leptoquark (LQ) pairs in the eν+jets channel using pp̅ collider data (∫Ldt≈115 pb-1) collected by the D0 experiment at the Fermilab Tevatron during 1992–1996. The analysis yields no candidate events. We combine the results with those from the ee+jets and νν+jets channels to obtain 95% confidence level (C.L.) upper limits on the LQ pair production cross section as a function of mass and of β, the branching fraction to a charged lepton. Comparing with the next-to-leading order theory, we set 95% C.L. lower limits on the LQ mass of 225, 204, and 79 GeV/c2 for β = 1, 1/2, and 0, respectively.
© 1998 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.2051
DOI:
10.1103/PhysRevLett.80.2051
PACS:
14.80.-j, 12.60.-i, 13.85.Rm
*Visitor from Universidad San Francisco de Quito, Quito, Ecuador. †Visitor from IHEP, Beijing, China.
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