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Search for a Higgs boson decaying into γ^*γ → ℓℓγ with low dilepton mass in pp collisions at √s = 8 TeV

Khachatryan, V. and Anderson, D. and Apresyan, A. and Bornheim, A. and Bunn, J. and Chen, Y. and Duarte, J. and Mott, A. and Newman, H. B. and Pena, C. and Pierini, M. and Spiropulu, M. and Vlimant, J. R. and Xie, S. and Zhu, R. Y. and Dubinin, M. (2016) Search for a Higgs boson decaying into γ^*γ → ℓℓγ with low dilepton mass in pp collisions at √s = 8 TeV. Physics Letters B, 753 . pp. 341-362. ISSN 0370-2693. http://resolver.caltech.edu/CaltechAUTHORS:20160304-084830940

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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 < m_(ℓℓγ) < 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).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.physletb.2015.12.039DOIArticle
http://www.sciencedirect.com/science/article/pii/S0370269315009879PublisherArticle
http://arxiv.org/abs/1507.03031arXivDiscussion Paper
ORCID:
AuthorORCID
Spiropulu, M.0000-0001-8172-7081
Alternate Title:Search for a Higgs boson decaying into γ*γ → ℓℓγ with low dilepton mass in pp collisions at √s = 8 TeV
Additional Information:© 2015 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3. Received 10 July 2015; Received in revised form 12 October 2015; Accepted 14 December 2015; Available online 17 December 2015. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERC IUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A.P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS programme of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Programme by Qatar National Research Fund; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand); and the Welch Foundation.
Group:CMS@Caltech
Funders:
Funding AgencyGrant Number
Bundesministerium für Wissenschaft, Forschung und Wirtschaft (BMWFW)UNSPECIFIED
FWF Der WissenschaftsfondsUNSPECIFIED
Fonds de la Recherche Scientifique (FNRS)UNSPECIFIED
Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)UNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)UNSPECIFIED
Ministry of Education and Science (Bulgaria)UNSPECIFIED
CERNUNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
Ministry of Science and Technology (China)UNSPECIFIED
National Natural Science Foundation of ChinaUNSPECIFIED
COLCIENCIAS (Colombia)UNSPECIFIED
MSES (Croatia)UNSPECIFIED
CSF (Croatia)UNSPECIFIED
RPF (Cyprus)UNSPECIFIED
MoER (Estonia)UNSPECIFIED
ERC IUT (Estonia)UNSPECIFIED
European Regional Development Fund, EstoniaUNSPECIFIED
Academy of FinlandUNSPECIFIED
Ministry of Education and Culture (Finland)UNSPECIFIED
Helsinki Institute of Physics UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF)UNSPECIFIED
General Secretariat for Research and Technology (GSRT)UNSPECIFIED
OTKA (Hungary)UNSPECIFIED
NIH (Hungary)UNSPECIFIED
DAE (India)UNSPECIFIED
DST (India)UNSPECIFIED
IPM (Iran)UNSPECIFIED
Science Foundation, IrelandUNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
MSIP (Korea)UNSPECIFIED
National Research Foundation of KoreaUNSPECIFIED
LAS (Lithuania)UNSPECIFIED
MOE (Malaysia)UNSPECIFIED
UM (Malaysia)UNSPECIFIED
CINVESTAV (Mexico)UNSPECIFIED
Consejo Nacional de Ciencia y Tecnología (CONACyT)UNSPECIFIED
SEP (Mexico)UNSPECIFIED
UASLP-FAI (Mexico)UNSPECIFIED
MBIE (New Zealand)UNSPECIFIED
Pakistan Atomic Energy CommissionUNSPECIFIED
MSHE (Poland)UNSPECIFIED
NSC (Poland)UNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)UNSPECIFIED
JINR (Dubna)UNSPECIFIED
MON (Russia)UNSPECIFIED
RosAtom (Russia)UNSPECIFIED
Russian Academy of SciencesUNSPECIFIED
Russian Foundation for Basic ResearchUNSPECIFIED
MESTD (Serbia)UNSPECIFIED
SEIDI (Spain)UNSPECIFIED
Centro Nacional de Física de Partículas, Astropartículas y Nuclear (CPAN)UNSPECIFIED
Swiss Funding AgenciesUNSPECIFIED
Ministry of Science and Technology (Taipei)UNSPECIFIED
ThEPCenter (Thailand)UNSPECIFIED
IPST (Thailand)UNSPECIFIED
STAR (Thailand)UNSPECIFIED
NSTDA (Thailand)UNSPECIFIED
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)UNSPECIFIED
Türkiye Atom Enerjisi Kurumu (TAEK)UNSPECIFIED
NASU (Ukraine)UNSPECIFIED
SFFR (Ukraine)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Marie-Curie programmeUNSPECIFIED
European Research Council (ERC)UNSPECIFIED
EPLANETUNSPECIFIED
Leventis FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Belgian Federal Science Policy Office (BELSPO)UNSPECIFIED
Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)UNSPECIFIED
Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)UNSPECIFIED
Ministry of Education, Youth and Sports (MEYS) of the Czech RepublicUNSPECIFIED
Council of Science and Industrial Research (India)UNSPECIFIED
Foundation for Polish Science HOMING PLUS programmeUNSPECIFIED
European Union Regional Development FundUNSPECIFIED
Compagnia di San Paolo (Torino)UNSPECIFIED
Consorzio per la Fisica (Trieste)UNSPECIFIED
Ministero dell'Istruzione, dell'Università della Ricerca (MIUR)20108T4XTM
Thalis programmeUNSPECIFIED
Aristeia programmeUNSPECIFIED
European Social FundUNSPECIFIED
Greek National Strategic Reference Framework (NSRF)UNSPECIFIED
Qatar National Research Fund National Priorities Research ProgramUNSPECIFIED
Chulalongkorn University (Thailand)UNSPECIFIED
Welch FoundationUNSPECIFIED
SCOAP3UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)UNSPECIFIED
Subject Keywords:CMS; Physics; Higgs boson; Dalitz decay
Record Number:CaltechAUTHORS:20160304-084830940
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160304-084830940
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65073
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Mar 2016 17:26
Last Modified:04 Mar 2016 17:26

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