Search for second generation scalar leptoquarks in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

TL;DR

This paper reports a search for second generation scalar leptoquarks in proton-proton collisions at 7 TeV using ATLAS data, setting mass exclusion limits based on observed event yields consistent with Standard Model predictions.

Contribution

It presents the first ATLAS search for second generation scalar leptoquarks at 7 TeV, establishing new mass exclusion limits.

Findings

Leptoquarks with mass below 594 GeV are excluded at 95% CL for a branching ratio of 0.5.

No significant excess over Standard Model background was observed.

The analysis constrains leptoquark models in the specified mass range.

Abstract

The results of a search for the production of second generation scalar leptoquarks are presented for final states consisting of either two oppositely charged muons and at least two jets or a muon plus missing transverse momentum and at least two jets. A total of 1.03/fb integrated luminosity of proton-proton collision data produced by the Large Hadron Collider at sqrt(s) = 7 TeV and recorded by the ATLAS detector is used for the search. The event yields in the signal regions are found to be consistent with the Standard Model background expectations. The production of second generation leptoquarks is excluded for a leptoquark mass m_LQ < 594 (685) GeV at 95% confidence level, for a branching ratio of 0.5 (1.0) for leptoquark decay to a muon and a quark.