Search for a Higgs boson decaying into γ⁎γ→ℓℓγ with low dilepton mass in pp collisions at √ s = 8 TeV
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© 2015 The Authors. A search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (ℓℓγ). The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. No excess above background has been found in the three-body invariant mass range 120<mℓℓγ<150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H→γ*γ→ℓℓγ, where the dilepton invariant mass is less than 20 GeV. For a Higgs boson with mH=125 GeV, a 95% confidence level (CL) exclusion observed (expected) limit is 6.7 (5.9-1.8+2.8) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H→(J/ψ)γ for the 125 GeV Higgs boson is set at 1.5×10-3.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Khachatryan, V., et al. "Search for a Higgs Boson Decaying into Gamma*Gamma -> Ll Gamma with Low Dilepton Mass in Pp Collisions at Root S=8 Tev." Physics Letters B 753 (2016): 341-62.
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