Abstract
A search for a heavy resonance decaying into WZ in the fully leptonic channel (electrons and muons) is performed. It is based on proton–proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 36.1 fb−1. No significant excess is observed over the Standard Model predictions and limits are set on the production cross section times branching ratio of a heavy vector particle produced either in quark–antiquark fusion or through vector-boson fusion. Constraints are also obtained on the mass and couplings of a singly charged Higgs boson, in the Georgi–Machacek model, produced through vector-boson fusion.
Highlights
Searches for diboson resonances provide an essential test of theories of electroweak symmetry breaking beyond the Standard Model (BSM)
The present analysis extends the search for resona√nt W Z production beyond that in Run 1 pp collision data at s = 8 TeV performed by the ATLAS [24] and CMS [25] collaborations
A search is performed for resonant W Z production in fully l√eptonic final states using 36.1 fb−1 of s = 13 TeV pp data collected by the ATLAS experiment at the Large Hadron Collider (LHC) during the 2015 and 2016 run periods
Summary
Searches for diboson resonances provide an essential test of theories of electroweak symmetry breaking beyond the Standard Model (BSM). This Letter reports on a search for a W Z resonance in the fully leptonic decay channel ν ( = e or μ), produced either by quark–antiquark (qq ) fusion or by vector-boson fusion (VBF). The singly charged members of this fiveplet are the object of the present search in the VBF channel For both models the intrinsic width of the resonance is below 4%, which is lower than the experimental resolution in most the parameter space explored in the present analysis. The VBF process (pp → W Z j j) is characterized by the presence of two jets with a large rapidity gap resulting from quarks from which a vector boson has been radiated The absence of this topology is interpreted as qqproduction, collectively referred to here as qq.
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