Search for Pair Production of Second Generation Scalar Leptoquarks in ppbar Collisions at sqrt(s)=1.96 TeV

TL;DR

This paper reports a search for second generation scalar leptoquarks in proton-antiproton collisions at 1.96 TeV, setting new lower mass limits based on the absence of observed signals in the muon-quark decay channel.

Contribution

It provides the first limits on second generation scalar leptoquark masses at this energy, improving previous bounds by analyzing ppbar collision data with the D0 detector.

Findings

No evidence for leptoquark signals was observed.

Lower mass limits of 251 GeV for beta=1 and 204 GeV for beta=1/2 were established.

The results extend previous constraints on second generation scalar leptoquarks.

Abstract

We report on a search for the pair production of second generation scalar leptoquarks (LQ_2) in ppbar collisions at the center-of-mass energy sqrt(s) = 1.96 TeV, using data corresponding to an integrated luminosity of 294 +- 19 pb^-1 recorded with the D0 detector. No evidence for a leptoquark signal in the LQ_2 LQ_2 -> muq muq channel has been observed, and upper bounds on the product of cross section times branching fraction were set. This yields lower mass limits of m(LQ_2) > 247 GeV for beta = Br(LQ_2->muq) = 1 and m(LQ_2) > 182 GeV for beta = 1/2. Combining these limits with previous D0 results, the lower limits on the mass of a second generation scalar leptoquark are m(LQ_2) > 251 GeV and m(LQ_2) > 204 GeV for beta = 1 and beta = 1/2, respectively.