Bounds on an anomalous dijet resonance in W+jets production in ppbar collisions at sqrt{s} =1.96 TeV

TL;DR

This study analyzes the dijet mass spectrum in W+jets events at Tevatron energies, setting limits on potential anomalous resonances and testing previous claims of such signals.

Contribution

It provides the first upper limits on the production cross section of a hypothesized dijet resonance in W+jets events at Tevatron energies, challenging prior observations.

Findings

No evidence for the anomalous dijet resonance was found.

Upper limits were set on the resonance production cross section.

The probability of a resonance at 145 GeV/c^2 with 4 pb cross section is extremely low.

Abstract

We present a study of the dijet invariant mass spectrum in events with two jets produced in association with a W boson in data corresponding to an integrated luminosity of 4.3 fb^-1 collected with the D0 detector at sqrt{s} =1.96 TeV. We find no evidence for anomalous resonant dijet production and derive upper limits on the production cross section of an anomalous dijet resonance recently reported by the CDF Collaboration, investigating the range of dijet invariant mass from 110 to 170 GeV/c^2. The probability of the D0 data being consistent with the presence of a dijet resonance with 4 pb production cross section at 145 GeV/c^2 is 8x10^-6.