Search for Supersymmetry at the LHC in Events with Jets and Missing Transverse Energy

TL;DR

This paper reports a search for supersymmetry in proton-proton collisions at 7 TeV using CMS data, employing the alphaT variable to distinguish events, but finds no evidence of supersymmetry, setting new exclusion limits.

Contribution

It introduces the alphaT variable as an effective discriminator in supersymmetry searches at the LHC, and provides the first exclusion limits on squark and gluino masses at 7 TeV.

Findings

No excess events observed over the standard model expectation.

Squark masses below 1.1 TeV are excluded at 95% CL.

Gluino masses below 1.1 TeV are excluded at 95% CL.

Abstract

A search for events with jets and missing transverse energy is performed in a data sample of pp collisions collected at sqrt(s) = 7 TeV by the CMS experiment at the LHC. The analyzed data sample corresponds to an integrated luminosity of 1.14 inverse femtobarns. In this search, a kinematic variable, alphaT, is used as the main discriminator between events with genuine and misreconstructed missing transverse energy. No excess of events over the standard model expectation is found. Exclusion limits in the parameter space of the constrained minimal supersymmetric extension of the standard model are set. In this model, squark masses below 1.1 TeV are excluded at 95% CL. Gluino masses below 1.1 TeV are also ruled out at 95% CL for values of the universal scalar mass parameter below 500 GeV.