Measurement of the $WW$ and $WZ$ production cross section using final states with a charged lepton and heavy-flavor jets in the full CDF Run II data set

Abstract

We present a measurement of the total {\it WW} and {\it WZ} production cross sections in $p\bar{p}$ collision at $\sqrt{s}=1.96$ TeV, in a final state consistent with leptonic $W$ boson decay and jets originating from heavy-flavor quarks from either a $W$ or a $Z$ boson decay. This analysis uses the full data set collected with the CDF II detector during Run II of the Tevatron collider, corresponding to an integrated luminosity of 9.4 fb${}^{-1}$. An analysis of the dijet mass spectrum provides $3.7\ddot{I}ƒ$ evidence of the summed production processes of either {\it WW} or {\it WZ} bosons with a measured total cross section of $\ddot{I}{ƒ}_{WW+WZ}=13.7\pm 3.9$~pb. Independent measurements of the {\it WW} and {\it WZ} production cross sections are allowed by the different heavy-flavor decay-patterns of the $W$ and $Z$ bosons and by the analysis of secondary-decay vertices reconstructed within heavy-flavor jets. The productions of {\it WW} and of {\it WZ} dibosons are independently seen with significances of $2.9\ddot{I}ƒ$ and $2.1\ddot{I}ƒ$, respectively, with total cross sections of $\ddot{I}{ƒ}_{WW}=9.4\pm 4.2$~pb and $\ddot{I}{ƒ}_{WZ}=3.7_{-2.2}^{+2.5}$~pb. The measurements are consistent with standard-model predictions.

19 pages, 11 figures, accepted for publication on Physical Review D