$Z_\gamma$ production and limits on anomalous $ZZ_\gamma$ and $Z_{\gamma\gamma}$ couplings in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ $\text{TeV}$

Abstract

We present a measurement of $p\bar{p}\rightarrow Z\gamma\rightarrow\ell^+\ell^-\gamma (\ell = e, \mu)$ production with a data sample corresponding to an integrated luminosity of $6.2$ $\text{fb}^{-1}$ collected by the D0 detector at the Fermilab Tevatron $p\bar{p}$ Collider. The results of the electron and muon channels are combined, and we measure the total production cross section and the differential cross section $d\sigma/dp^\gamma_T$, where $p^\gamma_T$ is the momentum of the photon in the plane transverse to the beam line. The results obtained are consistent with the standard model predictions from next-to-leading order calculations. We use the transverse momentum spectrum of the photon to place limits on anomalous $ZZ_\gamma$ and $Z_{\gamma\gamma}$ couplings.