1302.0389 (Federico Sforza)

Evidence for Diboson Production in the Lepton plus Heavy Flavor Jets
Final State at CDF    [PDF]

Federico Sforza

This thesis presents the evidence, at 3.08 sigma, for the associate production of massive vector bosons (W and Z) in a final state with one lepton, MET and HF-tagged jets, measured with the complete CDF II dataset (9.4fb^-1 of data). The signals, both inclusive diboson production and WW vs WZ/ZZ separately, were extracted from the invariant mass distribution, M_inv(jet1,jet2), of single and double HF-tagged jet pairs. For single-tagged events the b quark vs c quark discrimination was obtained by using a bi-dimensional distribution M_inv(jet1,jet2) vs a flavor-serapator NN. The results, consistent with the SM prediction, confirm the CDF capability of identify a small signal in this challenging final state. In particular we also report the previous version of this analysis, performed with a dataset of 7.5fb^-1 that was the first evidence of diboson production in lnu+HF final state at a hadron collider. Beyond the pure testing of SM predicted processes, several of the techniques developed for this thesis were also applied to the WH search at CDF, with a relevant improvement of the sensitivity to this process.

View original: http://arxiv.org/abs/1302.0389