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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

The CMS collaboration
Phys.Lett. B753 (2016) 341-362, 2016

Abstract (data abstract)
CERN-LHC. 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 (ll gamma). 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 inverse femtobarns. 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 < m[ll gamma] < 150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H to gamma* gamma to ll gamma, where the dilepton invariant mass is less than 20 GeV. For a Higgs boson with m[H] = 125 GeV, a 95% confidence level (CL) exclusion observed (expected) limit is 6.7 (5.9 +2.8/-1.8) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H to J/Psi gamma for the 125 GeV Higgs boson is set at 1.5E-3.

  • Table 1

    Data from Figure 6, muon channel

    10.17182/hepdata.73712.v1/t1

    The 95% CL exclusion limit, as a function of the mass hypothesis, $m_H$ , on $\sigma/\sigma_{SM}$, the cross section times...

  • Table 2

    Data from Figure 6, electron channel

    10.17182/hepdata.73712.v1/t2

    The 95% CL exclusion limit, as a function of the mass hypothesis, $m_H$ , on $\sigma/\sigma_{SM}$, the cross section times...

  • Table 3

    Data from Figure 6, combined muon and electron channels

    10.17182/hepdata.73712.v1/t3

    The 95% CL exclusion limit, as a function of the mass hypothesis, $m_H$ , on $\sigma/\sigma_{SM}$, the cross section times...

  • Table 4

    Data from Figure 7

    10.17182/hepdata.73712.v1/t4

    Fig. 7. The 95% CL exclusion limit on $\sigma (pp \to H)\mathcal{B}(H \to \mu\mu\gamma)$, with $m_{\mu\mu}$ < 20 GeV, for...

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