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Invariant Mass Distribution of Jet Pairs Produced in Association with a W Boson in p[overbar p] Collisions at [sqrt]s=1.96 TeV

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 (cid:1) 1 . The observed distribution has an excess in the 120 – 160 GeV =c 2 mass range which is not described by current theoretical predictions within the statistical and systematic uncertainties. In this Letter, we report studies of the properties of this excess.