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

2013/02/02 by Federico Sforza, Sforza, Federico
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.1302.0389

thesis

arxiv created 2013/02/02 · arxiv updated 2013/02/05

Abstract

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.

Related

• Evidence for WZ/WW->l nu + Heavy Flavors Vector Boson Production in 7.5 fb^-1 of CDF Data
• First Observation of Diboson Production in Hadronic Final State at the Tevatron
• Observation of Diboson Production in a Semileptonic Decay at CDF
• Searching for H->WW(*) and Other Diboson Final States at CDF
• Vector Boson + Heavy Flavor Jets Production at the Tevatron