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Search for first-generation scalar and vector leptoquarks
Baringer, Philip S. Bean, Alice Coppage, Don Hebert, C.
Baringer, Philip S.
Bean, Alice
Coppage, Don
Hebert, C.
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Abstract
We describe a search for the pair production of first-generation scalar and vector leptoquarks in the eejj and eνjj channels by the DØ Collaboration. The data are from the 1992–1996 pp-bar run at 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 eνjj channels are combined with those from a previous DØ analysis of the ννjj channel to obtain 95% confidence level (C.L.) upper limits on the leptoquark pair-production cross section as a function of mass and of β, 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 β=1, 12, 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 β=1, 12, and 0, respectively. Mass limits for vector leptoquarks are also set for anomalous vector couplings.
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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.64.092004.
Date
2001-09-09
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American Physical Society
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V. M. Abazov et al. ((DØ Collaboration)). (2001). "Search for first-generation scalar and vector leptoquarks." Physical Review D, 64(9):092004. http://dx.doi.org/10.1103/PhysRevD.64.092004