/ hep-ex CMS-SMP-13-009

A search for WW$\gamma$ and WZ$\gamma$ production and constraints on anomalous quartic gauge couplings in pp collisions at $\sqrt{s}$ = 8 TeV

Pages: 33

Abstract: A search for WV$\gamma$ triple vector boson production is presented based on events containing a W boson decaying to a muon or an electron and a neutrino, a second V (W or Z) boson, and a photon. The data correspond to an integrated luminosity of 19.3 inverse femtobarns collected in 2012 with the CMS detector at the LHC in pp collisions at $\sqrt{s}$ = 8 TeV. An upper limit of 311 fb on the fiducial cross section for the WV$\gamma$ production process is obtained at 95% confidence level for photons with a transverse energy above 30 GeV and with an absolute value of pseudorapidity of less than 1.44. This limit is approximately a factor of 3.4 larger than the standard model predictions that are based on next-to-leading order QCD calculations. Since no evidence of anomalous WW$\gamma\gamma$ or WWZ$\gamma$ quartic gauge boson couplings is found, this paper presents the first experimental limits on the dimension-8 parameter $f_{T,0}$ and the CP-conserving WWZ$\gamma$ parameters $\kappa_0^W$ and $\kappa_C^W$. Limits are also obtained for the WW$\gamma\gamma$ parameters $a_0^W$ and $a_C^W$.

Note: Submitted to Phys. Rev. D

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