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

In this search additional operators that would lead to anomalous $\mathrm{W}\mathrm{W}\gamma$ or WWZ couplings are constrained by studying events with one W boson decaying to $\mathrm{e}\nu$ or $\mu\nu$, and one W or Z boson decaying hadronically, reconstructed as a single massive large-radius jet. The search uses a data set of proton-proton collisions with a centre-of-mass energy of 13 TeV as recorded by the CMS experiment at the CERN LHC in the year 2016, corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. Using the reconstructed diboson invariant mass, $95\%$ confidence intervals are derived for the anomalous coupling parameters of $-1.58 < c_{\mathrm{W}\mathrm{W}\mathrm{W}}/\Lambda ^2 < 1.59~\mathrm{TeV}^{-2}$, $-2.00 < c_{\mathrm{W}}/\Lambda^2 < 2.65~\mathrm{TeV}^{-2}$, and $-8.78 < c_{\mathrm{B}}/\Lambda^2 < 8.54~\mathrm{TeV}^{-2}$, in agreement with standard model expectations.