# Measurements of the pp to W gamma gamma and pp to Z gamma gamma cross sections and limits on anomalous quartic gauge couplings at sqrt(s) = 8 TeV

## TL;DR

This paper reports measurements of W gamma gamma and Z gamma gamma production cross sections at 8 TeV, confirming Standard Model predictions and setting limits on anomalous quartic gauge couplings using CMS data.

## Contribution

First measurement of W gamma gamma and Z gamma gamma cross sections at 8 TeV, including limits on anomalous gauge couplings using a large CMS dataset.

## Key findings

- Measured cross sections consistent with Standard Model
- Established significance levels of 2.6 and 5.9 sigma
- Set new limits on anomalous quartic gauge couplings

## 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 inverse femtobarns collected with the CMS detector at a center-of-mass energy of 8 TeV. Signal is identified through the W to l nu and Z to ll decay modes, where l 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.