Abstract
A search for WV gamma triple vector boson production is presented based on events containing a W boson decaying to a muon or an electron and a neutrino, a second V (W or Z) boson, and a photon. The data correspond to an integrated luminosity of 19.3 inverse femtobarns collected in 2012 with the CMS detector at the LHC in pp collisions at sqrt(s) = 8 TeV. An upper limit of 311 fb on the fiducial cross section for the WV gamma production process is obtained at 95% confidence level for photons with a transverse energy above 30 GeV and with an absolute value of pseudorapidity of less than 1.44. This limit is approximately a factor of 3.4 larger than the standard model predictions that are based on next-to-leading order QCD calculations. Since no evidence of anomalous WW gamma gamma or WWZ gamma quartic gauge boson couplings is found, this paper presents the first experimental limits on the dimension-8 parameter f[T,0] and the CP-conserving WWZ gamma parameters kappa[0,W] and kappa[C,W]. Limits are also obtained for the WW gamma gamma parameters a[0,W] and a[C,W].
Highlights
The standard model (SM) of particle physics provides a good description of the existing high-energy data [1]
The diboson WW and WZ production cross sections have been precisely measured at the Large Hadron Collider (LHC) and are in agreement with SM expectations [2,3,4,5,6]
The observables used in the photon selection are isolation variables based on the particle flow (PF) algorithm and they are corrected for the contribution due to pileup, the ratio of hadronic energy in the hadron calorimeter (HCAL) that is Events / 42 GeV
Summary
The standard model (SM) of particle physics provides a good description of the existing high-energy data [1]. This paper presents a search for the production of three gauge bosons WWγ and WZγ, together denoted as WVγ. It represents an extension of the measurement of diboson production presented in Ref. Together with the triple WVγ gauge boson vertices, the SM predicts the existence of the quartic WWWW, WWZZ, WWZγ, and WWγγ vertices. The study of gauge boson self-interactions may provide evidence for the existence of new phenomena at a higher energy scale [13,14,15,16]. This paper presents a search for WVγ production in the single lepton final state, which includes Wð→ lνÞWð→ jjÞγ and Wð→ lνÞZð→ jjÞγ processes, with l 1⁄4 e, μ. WWγ and WZγ processes are treated as a single combined signal
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