Search for new particles decaying into dijets in proton-antiproton collisions at sqrt(s) = 1.96 TeV

TL;DR

This study searches for new particles decaying into dijets in proton-antiproton collisions at 1.96 TeV, finding no evidence of such particles and setting mass exclusion limits based on the data.

Contribution

First comprehensive search for various hypothetical particles decaying into dijets at this energy, establishing new mass exclusion limits.

Findings

Dijet mass spectrum consistent with QCD predictions

No significant evidence of new particles found

Set upper limits on production cross sections and mass exclusions

Abstract

We present a search for new particles whose decays produce two jets (dijets) using proton-antiproton collision data corresponding to an integrated luminosity of 1.13 fb-1 collected with the CDF II detector. The measured dijet mass spectrum is found to be consistent with next-to-leading-order perturbative QCD predictions, and no significant evidence of new particles is found. We set upper limits at the 95% confidence level on cross sections times the branching fraction for the production of new particles decaying into dijets with both jets having a rapidity magnitude |y| < 1. These limits are used to determine the mass exclusions for the excited quark, axigluon, flavor-universal coloron, E6 diquark, color-octet technirho, W', and Z'.