Search for anomalous couplings in semileptonic WW and WZ decays at sqrt(s) = 13 TeV

The increased center of mass energy of the LHC Run II allows for a much larger reach to study possible deviations from the standard model in a generic manner, using an effective field theory approach. In this analysis we constrain additional operators that would lead to anomalous WW$\gamma$ or WWZ couplings by studying events with one W boson decaying to an electron or muon and neutrino and one W or Z boson decaying hadronically. The study uses a sample of proton-proton collisions collected with the CMS experiment at a center-of-mass energy of $\sqrt{s}=13$~TeV corresponding to an integrated luminosity of 2.3~fb$^{-1}$. %As the contribution from anomalous couplings is expected to be most visible at high scales, we employ jet-substructure techniques to identify the hadronically decaying boson. Using di-boson mass distributions we derive 95\% confidence intervals for the anomalous coupling parameters $\frac{c_{WWW}}{\Lambda ^2}$ ([-9.46 , 9.42]~TeV$^{-2}$), $\frac{c_{W}}{\Lambda ^2}$ ([-12.6, 12.0]~TeV$^{-2}$) and $\frac{c_{B}}{\Lambda ^2}$ ([-56.1, 55.4]~TeV$^{-2}$), in agreement with standard model expectations.