Invariant Mass Distribution of Jet Pairs Produced in Association with a W Boson in p(p)over-bar Collisions at root s=1.96 TeV

Abstract

We report a study of the invariant mass distribution of jet pairs produced in association with a W boson using data collected with the CDF detector which correspond to an integrated luminosity of 4.3 fb?1. The observed distribution has an excess in the 120-160 GeV/c2 mass range which is not described by current theoretical predictions within the statistical and systematic uncertainties.