Invariant-mass Distribution of Jet Pairs Produced in Association with Awboson Inpp¯collisions At<…

We report on a study of the dijet invariant-mass distribution in events with one identified lepton, a significant imbalance in the total event transverse momentum, and two jets. This distribution is sensitive to the possible production of a new particle in association with a $W$ boson, where the boson decays leptonically. We use the full data set of proton-antiproton collisions at 1.96 TeV center-of-mass energy collected by the Collider Detector at the Fermilab Tevatron, corresponding to an integrated luminosity of $8.9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The data are found to be consistent with standard model expectations, and a 95% confidence level upper limit is set on the production cross section of a $W$ boson in association with a new particle decaying into two jets.