Phys. Rev. Lett.
84,
2088–2093
(2000)
Search for Second-Generation Leptoquark Pairs in p̅ p Collisions at √s = 1.8TeV
B. Abbott et al. (D0 Collaboration)
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B. Abbott47, M. Abolins44, V. Abramov19, B. S. Acharya13, D. L. Adams54, M. Adams30, S. Ahn29, V. Akimov17, G. A. Alves2, N. Amos43, E. W. Anderson36, M. M. Baarmand49, V. V. Babintsev19, L. Babukhadia49, A. Baden40, B. Baldin29, S. Banerjee13, J. Bantly53, E. Barberis22, P. Baringer37, J. F. Bartlett29, U. Bassler9, A. Belyaev18, S. B. Beri11, G. Bernardi9, I. Bertram20, V. A. Bezzubov19, P. C. Bhat29, V. Bhatnagar11, M. Bhattacharjee49, G. Blazey31, S. Blessing27, A. Boehnlein29, N. I. Bojko19, F. Borcherding29, A. Brandt54, R. Breedon23, G. Briskin53, R. Brock44, G. Brooijmans29, A. Bross29, D. Buchholz32, V. S. Burtovoi19, J. M. Butler41, W. Carvalho3, D. Casey44, Z. Casilum49, H. Castilla-Valdez15, D. Chakraborty49, K. M. Chan48, S. V. Chekulaev19, W. Chen49, D. K. Cho48, S. Choi26, S. Chopra27, B. C. Choudhary26, J. H. Christenson29, M. Chung30, D. Claes45, A. R. Clark22, W. G. Cobau40, J. Cochran26, L. Coney34, B. Connolly27, W. E. Cooper29, D. Coppage37, D. Cullen-Vidal53, M. A. C. Cummings31, D. Cutts53, O. I. Dahl22, K. Davis21, K. De54, K. Del Signore43, M. Demarteau29, D. Denisov29, S. P. Denisov19, H. T. Diehl29, M. Diesburg29, G. Di Loreto44, P. Draper54, Y. Ducros10, L. V. Dudko18, S. R. Dugad13, A. Dyshkant19, D. Edmunds44, J. Ellison26, V. D. Elvira49, R. Engelmann49, S. Eno40, G. Eppley56, P. Ermolov18, O. V. Eroshin19, J. Estrada48, H. Evans46, V. N. Evdokimov19, T. Fahland25, M. K. Fatyga48, S. Feher29, D. Fein21, T. Ferbel48, H. E. Fisk29, Y. Fisyak50, E. Flattum29, F. Fleuret22, M. Fortner31, K. C. Frame44, S. Fuess29, E. Gallas29, A. N. Galyaev19, P. Gartung26, V. Gavrilov17, R. J. Genik, II20, K. Genser29, C. E. Gerber29, Y. Gershtein53, B. Gibbard50, R. Gilmartin27, G. Ginther48, B. Gobbi32, B. Gómez5, G. Gómez40, P. I. Goncharov19, J. L. González Solís15, H. Gordon50, L. T. Goss55, K. Gounder26, A. Goussiou49, N. Graf50, P. D. Grannis49, D. R. Green29, J. A. Green36, H. Greenlee29, S. Grinstein1, P. Grudberg22, S. Grünendahl29, G. Guglielmo52, J. A. Guida21, J. M. Guida53, A. Gupta13, S. N. Gurzhiev19, G. Gutierrez29, P. Gutierrez52, N. J. Hadley40, H. Haggerty29, S. Hagopian27, V. Hagopian27, K. S. Hahn48, R. E. Hall24, P. Hanlet42, S. Hansen29, J. M. Hauptman36, C. Hays46, C. Hebert37, D. Hedin31, A. P. Heinson26, U. Heintz41, T. Heuring27, R. Hirosky30, J. D. Hobbs49, B. Hoeneisen6, J. S. Hoftun53, F. Hsieh43, A. S. Ito29, S. A. Jerger44, R. Jesik33, T. Joffe-Minor32, K. Johns21, M. Johnson29, A. Jonckheere29, M. Jones28, H. Jöstlein29, S. Y. Jun32, S. Kahn50, E. Kajfasz8, D. Karmanov18, D. Karmgard34, R. Kehoe34, S. K. Kim14, B. Klima29, C. Klopfenstein23, B. Knuteson22, W. Ko23, J. M. Kohli11, D. Koltick35, A. V. Kostritskiy19, J. Kotcher50, A. V. Kotwal46, A. V. Kozelov19, E. A. Kozlovsky19, J. Krane36, M. R. Krishnaswamy13, S. Krzywdzinski29, M. Kubantsev38, S. Kuleshov17, Y. Kulik49, S. Kunori40, F. Landry44, G. Landsberg53, A. Leflat18, J. Li54, Q. Z. Li29, J. G. R. Lima3, D. Lincoln29, S. L. Linn27, J. Linnemann44, R. Lipton29, J. G. Lu4, A. Lucotte49, L. Lueking29, A. K. A. Maciel31, R. J. Madaras22, V. Manankov18, S. Mani23, H. S. Mao4, R. Markeloff31, T. Marshall33, M. I. Martin29, R. D. Martin30, K. M. Mauritz36, B. May32, A. A. Mayorov33, R. McCarthy49, J. McDonald27, T. McKibben30, J. McKinley44, T. McMahon51, H. L. Melanson29, M. Merkin18, K. W. Merritt29, C. Miao53, H. Miettinen56, A. Mincer47, C. S. Mishra29, N. Mokhov29, N. K. Mondal13, H. E. Montgomery29, M. Mostafa1, H. da Motta2, E. Nagy8, F. Nang21, M. Narain41, V. S. Narasimham13, H. A. Neal43, J. P. Negret5, S. Negroni8, D. Norman55, L. Oesch43, V. Oguri3, R. Olivier9, N. Oshima29, D. Owen44, P. Padley56, A. Para29, N. Parashar42, R. Partridge53, N. Parua7, M. Paterno48, A. Patwa49, B. Pawlik16, J. Perkins54, M. Peters28, R. Piegaia1, H. Piekarz27, Y. Pischalnikov35, B. G. Pope44, H. B. Prosper27, S. Protopopescu50, J. Qian43, P. Z. Quintas29, R. Raja29, S. Rajagopalan50, N. W. Reay38, S. Reucroft42, M. Rijssenbeek49, T. Rockwell44, M. Roco29, P. Rubinov32, R. Ruchti34, J. Rutherfoord21, A. Sánchez-Hernández15, A. Santoro2, L. Sawyer39, R. D. Schamberger49, H. Schellman32, J. Sculli47, E. Shabalina18, C. Shaffer27, H. C. Shankar13, R. K. Shivpuri12, D. Shpakov49, M. Shupe21, R. A. Sidwell38, H. Singh26, J. B. Singh11, V. Sirotenko31, P. Slattery48, E. Smith52, R. P. Smith29, R. Snihur32, G. R. Snow45, J. Snow51, S. Snyder50, J. Solomon30, X. F. Song4, M. Sosebee54, N. Sotnikova18, M. Souza2, N. R. Stanton38, G. Steinbrück46, R. W. Stephens54, M. L. Stevenson22, F. Stichelbaut50, D. Stoker25, V. Stolin17, D. A. Stoyanova19, M. Strauss52, K. Streets47, M. Strovink22, L. Stutte29, A. Sznajder3, J. Tarazi25, M. Tartaglia29, T. L. T. Thomas32, J. Thompson40, D. Toback40, T. G. Trippe22, A. S. Turcot43, P. M. Tuts46, P. van Gemmeren29, V. Vaniev19, N. Varelas30, A. A. Volkov19, A. P. Vorobiev19, H. D. Wahl27, J. Warchol34, G. Watts57, M. Wayne34, H. Weerts44, A. White54, J. T. White55, J. A. Wightman36, S. Willis31, S. J. Wimpenny26, J. V. D. Wirjawan55, J. Womersley29, D. R. Wood42, R. Yamada29, P. Yamin50, T. Yasuda29, K. Yip29, S. Youssef27, J. Yu29, Y. Yu14, M. Zanabria5, Z. Zhou36, Z. H. Zhu48, M. Zielinski48, D. Zieminska33, A. Zieminski33, V. Zutshi48, E. G. Zverev18, and A. Zylberstejn10 (D0 Collaboration)
1Universidad de Buenos Aires, Buenos Aires, Argentina
2LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
3Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
4Institute of High Energy Physics, Beijing, People's Republic of China
5Universidad de Los Andes, Bogotá, Colombia
6Universidad San Francisco de Quito, Quito, Ecuador
7Institut des Sciences Nucléaires, IN2P3-CNRS, Universite de Grenoble 1, Grenoble, France
8Centre de Physique des Particules de Marseillo, IN2P3-CNRS, Marseille, France
9LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
10DAPNIA/Service de Physique des Particules, CEA, Saclay, France
11Panjab University, Chandigarh, India
12Delhi University, Delhi, India
13Tata Institute of Fundamental Research, Mumbai, India
14Seoul National University, Seoul, Korea
15CINVESTAV, Mexico City, Mexico
16Institute of Nuclear Physics, Kraków, Poland
17Institute for Theoretical and Experimental Physics, Moscow, Russia
18Moscow State University, Moscow, Russia
19Institute for High Energy Physics, Protvino, Russia
20Lancaster University, Lancaster, United Kingdom
21University of Arizona, Tucson, Arisona 85721
22Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720
23University of California, Davis, California 95616
24California State University, Fresno, California 93740
25University of California, Irvine, California 92697
26University of California, Riverside, California 92521
27Florida State University, Tallahassee, Florida 32306
28University of Hawaii, Honolulu, Hawaii 96822
29Fermi National Accelerator Laboratory, Batavia, Illinois 60510
30University of Illinois at Chicago, Chicago, Illinois 60607
31Northern Illinois University, DeKalb, Illinois 60115
32Northwestern University, Evanston, Illinois 60208
33Indiana University, Bloomington, Indiana 47405
34University of Notre Dame, Notre Dame, Indiana 46556
35Purdue University, West Lafayette, Indiana 47907
36Iowa State University, Ames, Iowa 50011
37University of Kansas, Lawrence, Kansas 66045
38Kansas State University, Manhattan, Kansas 66506
39Louisiana Tech University, Ruston, Louisiana 71272
40University of Maryland, College Park, Maryland 20742
41Boston University, Boston, Massachusetts 02215
42Northeastern University, Boston, Massachusetts 02115
43University of Michigan, Ann Arbor, Michigan 48109
44Michigan State University, East Lansing, Michigan 48824
45University of Nebraska, Lincoln, Nebraska 68588
46Columbia University, New York, New York 10027
47New York University, New York, New York 10003
48University of Rochester, Rochester, New York 14627
49State University of New York, Stony Brook, New York 11794
50Brookhaven National Laboratory, Upton, New York 11973
51Langston University, Langston, Oklahoma 73050
52University of Oklahoma, Norman, Oklahoma 73019
53Brown University, Providence, Rhode Island 02912
54University of Texas, Arlington, Texas 76019
55Texas A&M University, College Station, Texas 77843
56Rice University, Houston, Texas 77005
57University of Washington, Seattle, Washington 98195
Received 20 October 1999; published in the issue dated 6 March 2000
We have searched for second-generation leptoquark (LQ) pairs in the μμ+jets channel using 94±5pb-1 of p̅ p collider data collected by the D0 experiment at the Fermilab Tevatron during 1993–1996. No evidence for a signal is observed. These results are combined with those from the μν+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 β, the branching fraction of a LQ decay into a charged lepton and a quark. Lower limits of 200(180)GeV/c2 for β = 1(1/2) are set at the 95% C.L. on the mass of scalar LQ. Mass limits are also set on vector leptoquarks as a function of β.
© 2000 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.2088
DOI:
10.1103/PhysRevLett.84.2088
PACS:
13.85.Rm, 13.85.Qk, 14.80.-j
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