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Search for a Higgs boson decaying into γ⁎ γ→ ℓℓγ with low dilepton mass in pp collisions at
CMS Collaboration
CMS Collaboration
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Abstract
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 GeV120<mℓℓγ<150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H→γ⁎γ→ℓℓγH→γ⁎γ→ℓℓγ, where the dilepton invariant mass is less than 20 GeV. For a Higgs boson with mH=125 GeVmH=125 GeV, a 95% confidence level (CL) exclusion observed (expected) limit is 6.7 (View the MathML source5.9−1.8+2.8) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H→(J/ψ)γH→(J/ψ)γ for the 125 GeV Higgs boson is set at 1.5×10−31.5×10−3.
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Date
2016-02-10
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Elsevier
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Keywords
CMS, Physics, Higgs boson, Dalitz decay
Citation
Khachatryan, V., Erbacher, R., Carrillo Montoya, C. A., Carvalho, W., Górski, M., Kotlinski, D., ... & Lander, R. (2015). Search for a Higgs boson decaying into $\gamma^*\gamma\to\ell\ell\gamma $ with low dilepton mass in pp collisions at $\sqrt s= $8 TeV. Phys. Lett., 753(CMS-HIG-14-003), 341-362.