Measurement of the p\bar{p}\to WZ + X cross section at \sqrt{s}=1.96 TeV and limits on WWZ trilinear gauge couplings

Abstract

We present measurements of the process $p\bar{p}\to WZ+X\to {\ell }^{\prime }{\nu }_{{\ell }^{\prime }}\ell \bar{\ell }$ at $\sqrt{s}=1.96$ TeV, where $\ell$ and ${\ell }^{\prime }$ are electrons or muons. Using 1 fb${}^{-1}$ of data from the D0 experiment, we observe 13 candidates with an expected background of $4.5\pm 0.6$ events and measure a cross section $\sigma (WZ)=2.7_{-1.3}^{+1.7}$ pb. From the number of observed events and the $Z$ boson transverse momentum distribution, we limit the trilinear $WWZ$ gauge couplings to $-0.17\le {\lambda }_Z\le 0.21$ $(\Delta {\kappa }_Z=0)$ at the 95% C.L. for a form factor scale $\Lambda =2$ TeV. Further, assuming that $\Delta g_1^Z=\Delta {\kappa }_Z$, we find $-0.12\le \Delta {\kappa }_Z\le 0.29$ $({\lambda }_Z=0)$ at the 95% C.L. These are the most restrictive limits on the $WWZ$ couplings available to date.

submitted to Phys. Rev. D

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