Measurement of the $WZ\to \ell \nu \ell \ell$ cross section and limits on anomalous triple gauge couplings in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV

Abstract

We present a new measurement of the $WZ\to \ell \nu \ell \ell$ ($\ell =e,\mu$) cross section and limits on anomalous triple gauge couplings. Using 4.1 fb${}^{-1}$ of integrated luminosity of $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV, we observe 34 $WZ$ candidate events with an estimated background of $6.0\pm 0.4$ events. We measure the $WZ$ production cross section to be $3.90_{-0.90}^{+1.06}$ pb, in good agreement with the standard model prediction. We find no evidence for anomalous $WWZ$ couplings and set 95% C.L. limits on the coupling parameters, $-0.075<{\lambda }_Z<0.093$ and $-0.027<\Delta {\kappa }_Z<0.080$, in the HISZ parameterization for a $\Lambda =2$ TeV form factor scale. These are the best limits to date obtained from the direct measurement of the $WWZ$ vertex.

arXiv comment8 pages, 7 figures, 2 tables

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