Search for First Generation Scalar and Vector Leptoquarks

Abazov, V. M.

doi:10.1103/PhysRevD.64.092004

Search for First Generation Scalar and Vector Leptoquarks

Journal Article · Tue May 01 04:00:00 EDT 2001 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.64.092004· OSTI ID:1892218

Abazov, V. M.

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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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: D0

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1892218

Report Number(s):: FERMILAB-PUB-01-057-E; arXiv:hep-ex/0105072; oai:inspirehep.net:557085

Journal Information:: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 64

Country of Publication:: United States

Language:: English

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