Header

UZH-Logo

Maintenance Infos

Search for a Higgs boson decaying into γ∗γ→ℓℓγ with low dilepton mass in pp collisions at $\sqrt{s} = 8$ TeV


CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Search for a Higgs boson decaying into γ∗γ→ℓℓγ with low dilepton mass in pp collisions at $\sqrt{s} = 8$ TeV. Physics Letters B, 753:341-362.

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 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$^{−3}$ .

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 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$^{−3}$ .

Statistics

Citations

Altmetrics

Downloads

10 downloads since deposited on 06 Jan 2017
10 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:06 Jan 2017 11:19
Last Modified:06 Sep 2017 14:18
Publisher:Elsevier
ISSN:0370-2693
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/http://dx.doi.org/10.1016/j.physletb.2015.12.039

Download

Download PDF  'Search for a Higgs boson decaying into γ∗γ→ℓℓγ with low dilepton mass in pp collisions at $\sqrt{s} = 8$ TeV'.
Preview
Content: Published Version
Filetype: PDF
Size: 965kB
View at publisher
Licence: Creative Commons: Attribution 3.0 Unported (CC BY 3.0)