Measurement of the electroweak production of Zγ and two jets in proton-proton collisions at s=13 TeV and constraints on anomalous quartic gauge couplings

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Abstract

The first observation of the electroweak (EW) production of a $Z$ boson, a photon, and two forward jets ($Z\ensuremath{\gamma}\mathrm{jj}$) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. A data set corresponding to an integrated luminosity of $137\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected by the CMS experiment at the LHC in 2016--2018 is used. The measured fiducial cross section for EW $Z\ensuremath{\gamma}\mathrm{jj}$ is ${\ensuremath{\sigma}}_{\mathrm{EW}}=5.21\ifmmode\pm\else\textpm\fi{}0.52(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0ex}{0ex}}0.56(\mathrm{syst})\text{ }\text{ }\mathrm{fb}=5.21\ifmmode\pm\else\textpm\fi{}0.76\text{ }\text{ }\mathrm{fb}$. Single-differential cross sections in photon, leading lepton, and leading jet transverse momenta, and double-differential cross sections in ${m}_{\mathrm{jj}}$ and $|\mathrm{\ensuremath{\Delta}}{\ensuremath{\eta}}_{\mathrm{jj}}|$ are also measured. Exclusion limits on anomalous quartic gauge couplings are derived at 95% confidence level in terms of the effective field theory operators ${\mathrm{M}}_{0}$ to ${\mathrm{M}}_{5}$, ${\mathrm{M}}_{7}$, ${\mathrm{T}}_{0}$ to ${\mathrm{T}}_{2}$, and ${\mathrm{T}}_{5}$ to ${\mathrm{T}}_{9}$.

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