Search for anomalous gauge couplings in semi-leptonic decays of $WW\gamma$ and $WZ\gamma$ in pp collisions at $\sqrt{s} =$ 8 TeV

Abstract

A study of the Standard Model (SM) three electroweak boson production, $WV\gamma$ where V = W or Z gauge boson, is presented concerning events with a leptonically decaying W boson accompanied by a photon and two or more jets. We are using the full 2012 dataset, of proton-proton collisions at a center-of-mass energy of 8 TeV and an integrated luminosity of 19.3 fb${}^{-1}$, collected by the CMS detector at the Large Hadron Collider (LHC). $WV\gamma$ production final states may be sensitive to anomalous $WW\gamma\gamma$ and $WWZ\gamma$ quartic couplings. In light of the recent discovery of a Higgs-like particle, we investigate, in a model independent way, any deviation of gauge boson couplings with respect to the SM prediction by setting limits on the anomalous quartic gauge couplings (aQGC) for $WW\gamma\gamma$ and $WWZ\gamma$. Upper limits at 95% confidence level are obtained, with and without a form factor.