Search For First-Generation Scalar And Vector Leptoquarks

M Adams,S Ahmed,G D Alexeev,G A Alves,Norman A Amos,E W Anderson,Y Arnoud, M M Baarmand, 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,D Bauer, A Bean,M Begel,Alexander Belyaev, S B Beri,G Bernardi,I Bertram,A Besson,R Beuselinck, V A Bezzubov,P C Bhat,V Bhatnagar,M Bhattacharjee,G Blazey,S Blessing,A Boehnlein,N I 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 Castillavaldez,D Chakraborty,K M Chan,S V Chekulaev,D K Cho,Suyong 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 Creperenaudin,M A C Cummings, D Cutts,G A Davis,Kristen A Davis,K De, S J De Jong,K Del Signore,M Demarteau, R Demina,P Demine,D 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,S R Dugad,A Duperrin,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,Y Fisyak, E Flattum,F Fleuret,M Fortner,H Fox,K C Frame, S Fu,S Fuess,E Gallas,A N Galyaev,Min 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,P D Grannis, J A Green, H Greenlee,S Grinstein,L Groer,S Grunendahl, A K Gupta,S N Gurzhiev,G Gutierrez,P Gutierrez, N J Hadley,H Haggerty, S Hagopian,Vasken Hagopian,R E Hall,P Hanlet,S Hansen,J M Hauptman,C Hays,C Hebert,D Hedin,J M Heinmiller,A P Heinson, U Heintz,T Heuring,M D Hildreth, R Hirosky, J D Hobbs,B Hoeneisen,Yi Huang,R Illingworth,A S Ito,M Jaffre, S Jain,R Jesik, K Johns,Michael C Johnson,A Jonckheere, Miriam C Jones,H Jostlein,A Juste,W Kahl,S Kahn,E Kajfasz,A M Kalinin,D Karmanov,Daniel John Karmgard, Zhende Ke, R Kehoe, A Khanov, A Kharchilava,Sun Kwang 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 A Kubantsev,S Kuleshov,Y Kulik, S Kunori, A Kupco,V E Kuznetsov,G Landsberg, W M Lee, A Leflat,C Leggett,F Lehner, Jianping Li,Q Z Li,Xuejun Li,J G R Lima,D Lincoln,Stephan Linn,J Linnemann, R Lipton, A Lucotte,L Lueking,C Lundstedt,Chao 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 R 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 Moore,M Mostafa,H Da Motta,E Nagy,F Nang,M Narain,V S Narasimham, H A Neal,J P Negret,S Negroni, T Nunnemann,D O Neil,V Oguri,B Olivier,N Oshima,P Padley,L J Pan,K Papageorgiou,A Para, N Parashar,R Partridge,N Parua,M Paterno,A Patwa,B Pawlik,James J Perkins, Matthew F Peters,O Peters,P Petroff, 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 P Rutherfoord,B M Sabirov,G Sajot,A Santoro,L Sawyer, R D Schamberger,H Schellman,A Schwartzman,N Sen,E Shabalina,R K Shivpuri,D Shpakov,M A Shupe,R A Sidwell, V Simak,H K Singh,J B Singh,V Sirotenko,P Slattery,E Smith, R P Smith,R Snihur,G R Snow, J Snow,Solomon H Snyder,J Solomon,V Sorin, M Sosebee,N Sotnikova,K Soustruznik, Marcelo A V Souza,N R Stanton,Georg Steinbruck,R W Stephens,F Stichelbaut,D P Stoker, V Stolin,A Stone,D A Stoyanova, M Strauss,M Strovink,L Stutte,A Sznajder, M Talby,William R Taylor,S Tentindorepond,S M Tripathi,T G Trippe,A S Turcot, P M Tuts,P Van Gemmeren,V Vaniev,G Graham,V M Abazov, B Abbott,A Abdesselam,M Abolins,V Abramov,B S Acharya,D L Adams,M Zanabria,Huajun Zheng,Zhongjun Zhou, M Zielinski, D Zieminska,A Zieminski,V Zutshi,E G Zverev,A Zylberstejn,R Van Kooten, N Varelas,L S Vertogradov,F Villeneuveseguier, A Volkov,A P Vorobiev,H D Wahl, Hanzi 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,Jianfeng Yu,Z Yu

PHYSICAL REVIEW D（2001）

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摘要

We describe a search for the pair production of first-generation scalar and vector leptoquarks in the eejj and evjj channels by the DO Collaboration. The data are from the 1992-1996 p (p) over bar run at roots = 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 evjj channels are combined with those from a previous DO analysis of the vvjj 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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vector,first-generation

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