Search for Dijet Resonances in 7 TeV pp Collisions at CMS

TL;DR

This paper reports a search for new narrow resonances in the dijet mass spectrum from 7 TeV proton-proton collisions at CMS, setting limits on various hypothetical particles and extending previous constraints.

Contribution

First search for narrow dijet resonances at 7 TeV with CMS, providing new exclusion limits on several beyond Standard Model particles.

Findings

Excluded string resonances below 2.50 TeV

Excluded excited quarks below 1.58 TeV

Set limits on axigluons, colorons, and E6 diquarks

Abstract

A search for narrow resonances in the dijet mass spectrum is performed using data corresponding to an integrated luminosity of 2.9 inverse pb collected by the CMS experiment at the LHC. Upper limits at the 95% confidence level (CL) are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately for decays into quark-quark, quark-gluon, or gluon-gluon pairs. The data exclude new particles predicted in the following models at the 95% CL: string resonances, with mass less than 2.50 TeV, excited quarks, with mass less than 1.58 TeV, and axigluons, colorons, and E_6 diquarks, in specific mass intervals. This extends previously published limits on these models.