Search for first-generation scalar and vector leptoquarks

V.M. Abazov B. Abbott A. Abdesselam 1 M. Abolins V. Abramov B.S. Acharya D.L. Adams M. Adams S.N. Ahmed G.D. Alexeev G.A. Alves N. Amos E.W. Anderson Y. Arnoud 2 M.M. Baarmand V V. Babintsev L. Babukhadia T C. Bacon A. Baden B. Baldin P W. Balm S. Banerjee E. Barberis P. Baringer J. Barreto J F. Bartlett U. Bassler 3 D. Bauer A. Bean M. Begel A. Belyaev S B. Beri G. Bernardi 3 I. Bertram A. Besson 2 R. Beuselinck V A. Bezzubov P C. Bhat V. Bhatnagar 1 M. Bhattacharjee G C. Blazey S. Blessing A. Boehnlein N. Bojko F. Borcherding K. Bos A. Brandt R. Breedon G. Briskin R. Brock G. Brooijmans A. Bross D. Buchholz M. Buehler V. Buescher V S. Burtovoi J M. Butler F. Canelli W. Carvalho D. Casey Z. Casilum H. Castilla-Valdez D. Chakraborty K M. Chan S V. Chekulaev D K. Cho S. Choi S. Chopra J H. Christenson M. Chung D. Claes a R. Clark J. Cochran L. Coney B. Connolly W E. Cooper D. Coppage S. Crepe-Renaudin 2 M a C. Cummings D. Cutts G A. Davis K. Davis K. De S J. de Jong K. del Signore M. Demarteau R. Demina P. Demine 2 D S. Denisov S P. Denisov S. Desai H T. Diehl M. Diesburg G. Di Loreto S. Doulas P. Draper Y. Ducros L V. Dudko S. Duensing L. Duflot 1 S R. Dugad A. Duperrin 4 A. Dyshkant D. Edmunds J. Ellison V D. Elvira R. Engelmann S. Eno G. Eppley P. Ermolov O V. Eroshin J. Estrada H. Evans V N. Evdokimov T. Fahland S. Feher D. Fein T. Ferbel F. Filthaut H E. Fisk Yu. Fisyak E. Flattum F. Fleuret M. Fortner H. Fox K C. Frame S. Fu S. Fuess E. Gallas a N. Galyaev M. Gao V. Gavrilov R J. Genik K. Genser C E. Gerber Y. Gershtein R. Gilmartin G. Ginther B. Gomez G. Gomez P I. Goncharov J L. Gonzalez-Solis H. Gordon L T. Goss K. Gounder A. Goussiou N. Graf G. Graham P D. Grannis J A. Green H. Greenlee S. Grinstein L. Groer S. Gruenendahl Anupam Gupta S N. Gurzhiev G. Gutierrez P. Gutierrez N J. Hadley H. Haggerty S. Hagopian V. Hagopian R E. Hall P. Hanlet Scott Hansen J M. Hauptman C. Hays Christian Hebert D. Hedin J.M. Heinmiller a P. Heinson U. Heintz T C. Heuring M D. Hildreth R. Hirosky J D. Hobbs B. Hoeneisen Yue Huang R. Illingworth a S. Ito M. Jaffre S. Jain R. Jesik K. Johns M. Johnson A. Jonckheere M. Jones H. Joestlein A. Juste W. Kahl S. Kahn E. Kajfasz 4 a M. Kalinin D. Karmanov D. Karmgard Z. Ke R. Kehoe A. Khanov A. Kharchilava S K. Kim B. Klima B. Knuteson W. Ko J M. Kohli a V. Kostritskiy J. Kotcher B. Kothari a V. Kotwal a V. Kozelov E A. Kozlovsky J. Krane M R. Krishnaswamy P. Krivkova S. Krzywdzinski M. Kubantsev S. Kuleshov Y. Kulik S. Kunori A. Kupco V E. Kuznetsov G L. Landsberg W.M. Lee A. Leflat C. Leggett F. Lehner J. Li Q Z. Li X. Li J G R. Lima D. Lincoln S L. Linn J. Linnemann R. Lipton A. Lucotte 2 L. Lueking C. Lundstedt C. Luo a K A. Maciel R J. Madaras V L. Malyshev V. Manankov H S. Mao T. Marshall M I. Martin R D. Martin K M. Mauritz B. May a A. Mayorov R. Mccarthy T. Mcmahon H L. Melanson M. Merkin K W. Merritt C. Miao H. Miettinen D. Mihalcea C S. Mishra N. Mokhov N K. Mondal H E. Montgomery R W. Moore M. Mostafa H. da Motta E. Nagy 4 F. Nang M. Narain V S. Narasimham H A. Neal J P. Negret S. Negroni T. Nunnemann D. O'Neil V. Oguri B. Olivier 3 N. Oshima P. Padley L J. Pan K. Papageorgiou A. Para N. Parashar R. Partridge N. Parua M. Paterno A. Patwa B. Pawlik J. Perkins M. Peters O. Peters P. Petroff 1 R. Piegaia B G. Pope E. Popkov H B. Prosper S. Protopopescu J. Qian R. Raja S. Rajagopalan E. Ramberg P A. Rapidis N W. Reay S. Reucroft M. Ridel M. Rijssenbeek F. Rizatdinova T. Rockwell M. Roco P. Rubinov R. Ruchti J. Rutherfoord B M. Sabirov G. Sajot 2 A. Santoro L. Sawyer R D. Schamberger H. Schellman A. Schwartzman N. Sen E. Shabalina R K. Shivpuri D. Shpakov M. Shupe R A. Sidwell V. Simak H. Singh J B. Singh V. Sirotenko P. Slattery E. Smith R P. Smith R. Snihur G A. Snow J. Snow S. Snyder J. Solomon V. Sorin M. Sosebee N. Sotnikova K. Soustruznik M. Souza N R. Stanton G. Steinbrueck R W. Stephens F. Stichelbaut D. Stoker V. Stolin A. Stone D A. Stoyanova M. Strauss M. Strovink L. Stutte A. Sznajder M. Talby 4 W. Taylor S. Tentindo-Repond S M. Tripathi T G. Trippe a S. Turcot P M. Tuts P. van Gemmeren V. Vaniev R. van Kooten N. Varelas L S. Vertogradov F. Villeneuve-Seguier 4 a A. Volkov a P. Vorobiev H D. Wahl H. Wang Z M. Wang J. Warchol G. Watts M. Wayne H. Weerts A. White J T. White D. Whiteson J A. Wightman D A. Wijngaarden S. Willis S J. Wimpenny J. Womersley D R. Wood R. Yamada P. Yamin T. Yasuda y A. Yatsunenko K. Yip S. Youssef J. Yu Z. Yu M. Zanabria H. Zheng Z. Zhou M. Zielinski D. Zieminska A. Zieminski V. Zutshi E G. Zverev A. Zylberstejn
Abstract : We describe a search for the pair production of first-generation scalar and vector leptoquarks in the eejj and enujj channels by the D0 Collaboration. The data are from the 1992--1996 ppbar run at sqrt{s} = 1.8 TeV at the Fermilab Tevatron collider. We find no evidence for leptoquark production; in addition, no kinematically interesting events are observed using relaxed selection criteria. The results from the eejj and enujj channels are combined with those from a previous D0 analysis of the nunujj channel to obtain 95% confidence level (C.L.) upper limits on the leptoquark pair-production cross section as a function of mass and of beta, the branching fraction to a charged lepton. These limits are compared to next-to-leading-order theory to set 95% C.L. lower limits on the mass of a first-generation scalar leptoquark of 225, 204, and 79 GeV/c^2 for beta=1, 1/2, and 0, respectively. For vector leptoquarks with gauge (Yang-Mills) couplings, 95% C.L. lower limits of 345, 337, and 206 GeV/c^2 are set on the mass for beta=1, 1/2, and 0, respectively. Mass limits for vector leptoquarks are also set for anomalous vector couplings.
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V.M. Abazov, B. Abbott, A. Abdesselam, M. Abolins, V. Abramov, et al.. Search for first-generation scalar and vector leptoquarks. Physical Review D, American Physical Society, 2001, 64, 092004-(21 p.). ⟨in2p3-00010605⟩

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