Search for anomalous couplings in boosted $WW/WZ \to\ellν q \overline q$ production in proton-proton collisions at $\sqrt{s} = 8$ TeV

Abstract

This Letter presents a search for new physics manifested as anomalous triple gauge boson couplings in WW and WZ diboson production in proton–proton collisions. The search is performed using events containing a W boson that decays leptonically and a W or Z boson whose decay products are merged into a single reconstructed jet. The data, collected at $\sqrt{s} = 8$ TeV with the CMS detector at the LHC, correspond to an integrated luminosity of 19 $fb^{−1}$. No evidence for anomalous triple gauge couplings is found and the following 95% confidence level limits are set on their values: $λ ([−0.011,0.011]), Δκ_γ ([−0.044,0.063])$, and $Δg_Z^1 ([−0.0087,0.024])$. These limits are also translated into their effective field theory equivalents: $c_{WWW}/Λ2 ([−2.7,2.7]TeV^{−2}), c_B/Λ2 ([−14,17]TeV−2)$, and $c_W/Λ2 ([−2.0,5.7]TeV^{−2})$.

Abstract

This Letter presents a search for new physics manifested as anomalous triple gauge boson couplings in WW and WZ diboson production in proton–proton collisions. The search is performed using events containing a W boson that decays leptonically and a W or Z boson whose decay products are merged into a single reconstructed jet. The data, collected at $\sqrt{s} = 8$ TeV with the CMS detector at the LHC, correspond to an integrated luminosity of 19 $fb^{−1}$. No evidence for anomalous triple gauge couplings is found and the following 95% confidence level limits are set on their values: $λ ([−0.011,0.011]), Δκ_γ ([−0.044,0.063])$, and $Δg_Z^1 ([−0.0087,0.024])$. These limits are also translated into their effective field theory equivalents: $c_{WWW}/Λ2 ([−2.7,2.7]TeV^{−2}), c_B/Λ2 ([−14,17]TeV−2)$, and $c_W/Λ2 ([−2.0,5.7]TeV^{−2})$.

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