We present the measurement of the diboson WW and WZ associate production in a final state consistent
with semileptonic W decay plus heavy flavor quarks.
This analysis uses the full dataset, collected with the CDF II detector at the Tevatron p-pbar collider and corresponding to an integrated
luminosity of approximately 9.4 fb-1. Candidate signal events are required to have one charged lepton, kinematics consitent with the W→lnu decay and two high ET
jets containing at least one secondary-decay vertex signaling the presence of heavy flavor hadrons. The analysis of the di-jet invariant mass spectrum allows to observe a
3.69 s.d. evidence of the WW+WZ production in this final state and to extract a cross section measurement of σWW+WZ = 13.7 +/- 3.9 pb.
The different heavy flavor decay pattern of the W and Z bosons (e.i. W→cs, Z→ b-bbar,c-cbar) and the analysis of the secondary-decay vertex properties allow
to independently measure the WW and WZ production cross section in a hadronic final state, for the first time at hadron colliders.
The measured cross sections of σWW= 9.4 +/- 4.2 pb and σWZ=3.7+2.5-2.2 pb
are consistent with the SM predictions and correspond to a signal significances of 2.87 s.d. and 2.12 s.d. for WW and WZ respectively.
Validation of kinematic distributions:
More details are provided in the public note
These results were blessed by the CDF Physics group in March, 2015
An accurate description of the analysis strategy, techniques, and preliminary results from 2012 are availale here: PhD Thesis
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