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## Search for first-generation scalar leptoquarks in $p\bar p$ collisions at $sqrt{s}$ = 1.96 TeV

### Abstract

D0We report on a search for pair production of first-generation scalar leptoquarks (LQ) in ppbar collisions at sqrt(s)=1.96 TeV using an integrated luminosity of 252pb-1 collected at the Fermilab Tevatron collider by the D0 detector. We observe no evidence for LQ production in the topologies arising from LQLQbar->eqeq and LQLQbar->eqnuq, and derive 95% C.L. lower limits on the LQ mass as a function of beta, where beta is the branching fraction for LQ->eq. The limits are 241 and 218 GeV/c2 for beta=1 and 0.5, respectively. These results are combined with those obtained by D0 at sqrt(s)=1.8 TeV, which increases these LQ mass limits to 256 and 234 GeV/c2

Topics: proton-proton inclusive interactions, high-energy elementary particle interactions, semileptonic decays, elementary particle mass, 14.80.-j, 13.85.Rm, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: American Physical Society
Year: 2005
DOI identifier: 10.1103/PhysRevD.71.071104
OAI identifier: oai:HAL:in2p3-00023534v1
Provided by: Hal-Diderot