Search for Resonances in the Dijet Mass Spectrum from 7 TeV pp Collisions at CMS

TL;DR

This study searches for high-mass narrow resonances in dijet events at 7 TeV proton-proton collisions, setting limits on various theoretical particles and excluding several models up to specific mass thresholds.

Contribution

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

Findings

No resonances observed in the data.

Excluded string resonances below 4.00 TeV.

Excluded excited quarks below 2.49 TeV.

Abstract

A search for narrow resonances with a mass of at least 1 TeV in the dijet mass spectrum is performed using pp collisions at sqrt(s)=7 TeV corresponding to an integrated luminosity of 1 inverse femtobarn, collected by the CMS experiment at the LHC. No resonances are observed. Upper limits at the 95% confidence level are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately for decays into quark-quark, quark-gluon, and gluon-gluon pairs. The data exclude new particles predicted in the following models at the 95% confidence level: string resonances with mass less than 4.00 TeV, E6 diquarks with mass less than 3.52 TeV, excited quarks with mass less than 2.49 TeV, axigluons and colorons with mass less than 2.47 TeV, and W' bosons with mass less than 1.51 TeV.