Search for Pair Production of Second-Generation Scalar Leptoquarks in pp Collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports a search for second-generation scalar leptoquarks in proton-proton collisions at 7 TeV, setting new upper limits on their production and excluding masses below 394 GeV at 95% confidence.

Contribution

It provides the most stringent limits to date on second-generation scalar leptoquark masses using CMS data at 7 TeV.

Findings

No excess events observed beyond standard model predictions.

Leptoquarks with masses below 394 GeV are excluded at 95% confidence level.

Set upper limits on leptoquark production cross section as a function of mass.

Abstract

A search for pair production of second-generation scalar leptoquarks in the final state with two muons and two jets is performed using proton-proton collision data at sqrt(s) = 7 TeV collected by the CMS detector at the LHC. The data sample used corresponds to an integrated luminosity of 34 inverse picobarns. The number of observed events is in good agreement with the predictions from the standard model processes. An upper limit is set on the second-generation leptoquark cross section times beta^2 as a function of the leptoquark mass, and leptoquarks with masses below 394 GeV are excluded at a 95% confidence level for beta = 1, where beta is the leptoquark branching fraction into a muon and a quark. These limits are the most stringent to date.