Invariant mass distribution of jet pairs produced in association with a leptonically decaying $W$ boson using 1.02 fb**-1 of ATLAS data

This note presents an updated study of the invariant mass distribution of jet pairs produced in association with a leptonically decaying $W$ boson in the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV. The analysis includes the electron and muon channels using an integrated luminosity of 1.02 fb**-1 collected in 2011. The measured dijet mass spectrum shows no significant excess over the Standard Model expectation.