Abstract
Measurements are presented of $W\gamma\gamma$ and $Z\gamma\gamma$ production in proton-proton collisions. Fiducial cross sections are reported based on a data sample corresponding to an integrated luminosity of 19.4 fb$^{−1}$ collected with the CMS detector at a center-of-mass energy of 8 TeV. Signal is identified through the $W \to \ell$v and $Z \to \ell\ell$ decay modes, where $\ell$ is a muon or an electron. The production of $W\gamma\gamma$ and $Z\gamma\gamma$, measured with significances of 2.6 and 5.9 standard deviations, respectively, is consistent with standard model predictions. In addition, limits on anomalous quartic gauge couplings in $W\gamma\gamma$ production are determined in the context of a dimension-8 effective field theory.
CMS Collaboration