Search for supersymmetry in pp collisions at sqrt{s} = 7TeV in final states with missing transverse momentum and b-jets

TL;DR

This paper reports a search for supersymmetric particles in proton-proton collisions at 7 TeV, focusing on events with missing transverse momentum and b-jets, setting new mass exclusion limits without observing significant excess.

Contribution

It provides the first constraints on gluino masses in models with sbottoms or stops as the only squarks in gluino decay cascades at 7 TeV.

Findings

Excluded gluino masses below 590 GeV for certain models

Excluded gluino masses below 520 GeV for alternative models

No significant excess over Standard Model predictions observed

Abstract

Results are presented of a search for supersymmetric particles in events with large missing transverse momentum and at least one heavy flavour jet candidate in sqrt{s} = 7 TeV proton-proton collisions. In a data sample corresponding to an integrated luminosity of 35 pb-1 recorded by the ATLAS experiment at the Large Hadron Collider, no significant excess is observed with respect to the prediction for Standard Model processes. For R-parity conserving models in which sbottoms (stops) are the only squarks to appear in the gluino decay cascade, gluino masses below 590 GeV (520 GeV) are excluded at the 95% C.L. The results are also interpreted in an MSUGRA/CMSSM supersymmetry breaking scenario with tan(beta)=40 and in an SO(10) model framework.