Search for anomalous couplings in the production of WW and WZ pairs decaying semileptonically in proton-proton collisions at $\sqrt{s}=8~\mathrm{TeV}$

A search for new physics is reported, in which the new physics appears in anomalous couplings of triple gauge boson vertices involving WW or WZ diboson production from proton-proton collisions. The search is performed on a sample of events containing a W boson that decays leptonically and a W or Z boson where the decay products are merged into a single jet. The data sample, collected at $\sqrt{s} = 8~\mathrm{TeV}$ with the CMS detector at the LHC, corresponds to an integrated luminosity of $19~\mathrm{fb}^{-1}$. No evidence for anomalous triple gauge couplings is found and the following $95\%$ confidence limits are set on their magnitudes: $\lambda$($[-0.011, 0.011]$), $\Delta{\kappa_\gamma}$($[-0.044, 0.063]$), and $\Delta{G_1^Z}$($[-0.0087, 0.024]$). These limits are also translated into their effective field theory equivalents: $c_{WWW}/\Lambda^2$($[-2.7, 2.7]~\mathrm{TeV}^{-2}$), $c_B/\Lambda^2$($[-14, 17]~\mathrm{TeV}^{-2}$), and $c_W/\Lambda^2$($[-2.0, 5.7]~\mathrm{TeV}^{-2}$).