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The cross section for W or Z boson production in association with two photonsis measured in proton-proton collisions at a centre-of-mass energy of 13 TeV.The data set corresponds to an integrated luminosity of 137 fb$^{-1}$ collectedby the CMS experiment at the LHC. The W $\to$ $\ell\nu$ and Z $\to$ $\ell\ell$decay modes (where $\ell =$ e, $\mu$) are used to extract the W$\gamma\gamma$and Z$\gamma\gamma$ cross sections in a phase space defined by electron (muon)with transverse momentum larger than 30 GeV and photon transverse momentumlarger than 20 GeV. All leptons and photons are required to have absolutepseudorapidity smaller than 2.5. The measured cross sections in this phasespace are $\sigma$(W$\gamma\gamma$) = 13.6 $^{+1.9}_{-1.9}$ (stat)${}^{+4.0}_{-4.0}$ (syst) $\pm$ 0.08 (PDF + scale) fb and$\sigma$(Z$\gamma\gamma$) = 5.41 $^{+0.58}_{-0.55}$ (stat) ${}^{+0.64}_{-0.70}$(syst) $\pm$ 0.06 (PDF + scale) fb. Limits on anomalous quartic gauge couplingsare set in the framework of an effective field theory with dimension-8operators.

the journal of high energy physics/the journal of high energy physics

Measurements of the pp $\to$ W$^\pm\gamma\gamma$ and pp $\to$  Z$\gamma\gamma$ cross sections at $\sqrt{s} =$ 13 TeV and limits on anomalous  quartic gauge couplings