Evidence of $W\gamma\gamma$ production in $pp$ collisions at $\sqrt{s}=8$ TeV and limits on anomalous quartic gauge couplings with the ATLAS detector

TL;DR

This paper presents the first evidence of $W o ext{lepton} u$ with two photons in proton-proton collisions at 8 TeV, measuring the cross section and setting limits on anomalous gauge couplings using ATLAS data.

Contribution

It reports the first evidence of $W o ext{lepton} u$ with two photons at 8 TeV and constrains anomalous quartic gauge couplings with ATLAS data.

Findings

Measured the fiducial cross section for $pp o W o ext{lepton} u ext{+} ext{two photons}$.

Set limits on anomalous quartic gauge couplings in high diphoton mass region.

Provided the first evidence of this process at the LHC.

Abstract

This Letter reports evidence of triple gauge boson production $pp\to W(\ell\nu)\gamma\gamma + X$, which is accessible for the first time with the 8 TeV LHC data set. The fiducial cross section for this process is measured in a data sample corresponding to an integrated luminosity of 20.3 fb$^{-1}$, collected by the ATLAS detector in 2012. Events are selected using the $W$ boson decay to $e\nu$ or $\mu\nu$ as well as requiring two isolated photons. The measured cross section is used to set limits on anomalous quartic gauge couplings in the high diphoton mass region.