# Invariant mass distribution of jet pairs produced in association with a W boson in pp collisions at sqrt[s]=1.96  TeV.

Research paper by T T Aaltonen, B B Álvarez González, S S Amerio, D D Amidei, A A Anastassov, A A Annovi, J J Antos, G G Apollinari, J A JA Appel, A A Apresyan, T T Arisawa, A A Artikov, J J Asaadi, W W Ashmanskas, B B Auerbach, et al.

Indexed on: 04 Jun '11Published on: 04 Jun '11Published in: Physical review letters

#### 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/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.