/ hep-ex CMS-SMP-15-008

Measurements of the $\mathrm{ pp \to W \gamma\gamma }$ and $\mathrm{ pp \to Z \gamma\gamma }$ cross sections and limits on anomalous quartic gauge couplings at $\sqrt{s} =$ 8 TeV

Pages: 34

Abstract: Measurements are presented of $\mathrm{ W \gamma\gamma }$ and $\mathrm{ Z \gamma\gamma }$ 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 $\mathrm{ W } \to \ell\nu$ and $\mathrm{ Z }\to\ell\ell$ decay modes, where $\ell$ is a muon or an electron. The production of $\mathrm{ W \gamma\gamma }$ and $\mathrm{ Z \gamma\gamma }$, 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 $\mathrm{ W \gamma\gamma }$ production are determined in the context of a dimension-8 effective field theory.

Note: Submitted to JHEP. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-15-008

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