Search for first-generation scalar and vector leptoquarks
We describe a search for the pair production of first-generation scalar and vector leptoquarks in the [Formula Presented] and [Formula Presented] channels by the DØ Collaboration. The data are from the 1992–1996 [Formula Presented] run at [Formula Presented] 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 [Formula Presented] and [Formula Presented] channels are combined with those from a previous DØ analysis of the [Formula Presented] channel to obtain 95% confidence level (C.L.) upper limits on the leptoquark pair-production cross section as a function of mass and of [Formula Presented] 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 [Formula Presented] for [Formula Presented] [Formula Presented] and 0, respectively. For vector leptoquarks with gauge (Yang-Mills) couplings, 95% C.L. lower limits of 345, 337, and 206 [Formula Presented] are set on the mass for [Formula Presented] [Formula Presented] and 0, respectively. Mass limits for vector leptoquarks are also set for anomalous vector couplings. © 2001 The American Physical Society.
Abazov, VM; Abbott, B; Abdesselam, A; Abolins, M; Abramov, V; Acharya, BS; Adams, DL; Adams, M; Ahmed, SN; Alexeev, GD; Alves, GA; Amos, N; Anderson, EW; Arnoud, Y; Baarmand, MM; Babintsev, VV; Babukhadia, L; Bacon, TC; Baden, A; Baldin, B; Balm, PW; Banerjee, S; Barberis, E; Baringer, P; Barreto, J; Bartlett, JF; Bassler, U; Bauer, D; Bean, A; Begel, M; Belyaev, A; Beri, SB; Bernardi, G; Bertram, I; Besson, A; Beuselinck, R; Bezzubov, VA; Bhat, PC; Bhatnagar, V; Bhattacharjee, M; Blazey, G; Blessing, S; Boehnlein, A; Bojko, NI; Borcherding, F; Bos, K; Brandt, A; Breedon, R; Briskin, G; Brock, R; Brooijmans, G; Bross, A; Buchholz, D; Buehler, M; Buescher, V; Burtovoi, VS; Butler, JM; Canelli, F; Carvalho, W; Casey, D; Casilum, Z; Castilla-Valdez, H; Chakraborty, D; Chan, KM; Chekulaev, SV; Cho, DK; Choi, S; Chopra, S; Christenson, JH; Chung, M; Claes, D; Clark, AR; Cochran, J; Coney, L; Connolly, B; Cooper, WE; Coppage, D; Crépé-Renaudin, S; Cummings, MAC; Cutts, D; Davis, GA; Davis, K; De, K; Jong, SJ; Del Signore, K; Demarteau, M; Demina, R; Demine, P; Denisov, D; Denisov, SP; Desai, S; Diehl, HT; Diesburg, M; Loreto, G; Doulas, S; Draper, P; Ducros, Y; Dudko, LV; Duensing, S; Duflot, L
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