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Title: 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

Abstract

Our 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. A Higgs boson with mH=125 GeV has 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 → (J/ψ)γ for the 125 GeV Higgs boson is set at 1.5 × 10 -3.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1234179
Alternate Identifier(s):
OSTI ID: 1221300
Report Number(s):
FERMILAB-PUB-15-332-CMS; CERN-PH-EP-2015-137; CMS-HIG-14-003
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1507.03031; TRN: US1601087
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 753; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; physics; Higgs boson; Dalitz decay

Citation Formats

Khachatryan, Vardan. 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. United States: N. p., 2015. Web. doi:10.1016/j.physletb.2015.12.039.
Khachatryan, Vardan. 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. United States. doi:10.1016/j.physletb.2015.12.039.
Khachatryan, Vardan. Thu . "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". United States. doi:10.1016/j.physletb.2015.12.039.
@article{osti_1234179,
title = {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},
author = {Khachatryan, Vardan},
abstractNote = {Our 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. A Higgs boson with mH=125 GeV has 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 → (J/ψ)γ for the 125 GeV Higgs boson is set at 1.5 × 10-3.},
doi = {10.1016/j.physletb.2015.12.039},
journal = {Physics Letters. Section B},
number = ,
volume = 753,
place = {United States},
year = {2015},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2015.12.039

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Cited by: 5 works
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