Study of the dijet mass spectrum in pp to W + jets events at sqrt(s) = 7 TeV

TL;DR

This study analyzes the dijet mass spectrum in proton-proton collisions at 7 TeV to search for resonant structures, finding no evidence of anomalies and setting limits on potential new physics signals.

Contribution

The paper provides the first detailed search for dijet resonances in W+jets events at 7 TeV, excluding models predicting a 150 GeV resonance.

Findings

No evidence for anomalous dijet structures near 150 GeV

Set an upper limit of 5.0 pb on cross section for a Gaussian signal

Excluded two theoretical models predicting a 150 GeV resonance

Abstract

We report an investigation of the invariant mass spectrum of the two jets with highest transverse momentum in pp to W+2-jet and W+3-jet events to look for resonant enhancements. The data sample corresponds to an integrated luminosity of 5.0 inverse femtobarns collected with the CMS detector at sqrt(s) = 7 TeV. We find no evidence for the anomalous structure reported by the CDF Collaboration, and establish an upper limit of 5.0 pb at 95% confidence level on the production cross section for a generic Gaussian signal with mass near 150 GeV. Additionally, we exclude two theoretical models that predict a CDF-like dijet resonance near 150 GeV.