Search for a Higgs boson decaying into gamma*gamma - GT ll gamma with low dilepton mass in pp collisions at root s=8 TeV

Khachatryan, V.; Adzic, R.; Ekmedzic, M.; Milošević, Jovan; Rekovic, V.; Đorđević, Miloš; Milenović, Predrag

doi:10.1016/j.physletb.2015.12.039

2016

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Authors

Khachatryan, V.
Adzic, R.
Ekmedzic, M.
Milošević, Jovan

Rekovic, V.
Đorđević, Miloš

Milenović, Predrag

CMS Collaboration (ukupan broj autora: 2306)

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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 (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 8TeV, 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 LT m(ll gamma) LT 150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H - GT gamma*gamma - GT 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(-1.8)(+2.8)) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H - ...

Keywords:

CMS / Physics / Higgs boson / Dalitz decay

Source:
Physics Letters B, 2016, 753, 341-362

Projects:

BMWFW (Austria), FWF (Austria), FNRS (Belgium), FWO (Belgium), CNPq (Brazil), CAPES (Brazil), FAPERJ (Brazil), FAPESP (Brazil), MES (Bulgaria), CERN, CAS (China), MoST (China), NSFC (China), COLCIENCIAS (Colombia), MSES (Croatia), CSF (Croatia), RPF (Cyprus), MoER (Estonia), ERC IUT (Estonia), ERDF (Estonia), Academy of Finland, MEC (Finland), HIP (Finland), CEA (France), CNRS/IN2P3 (France), BMBF, Germany, DFG (Germany), HGF (Germany), GSRT (Greece), OTKA (Hungary), NIH (Hungary), DAE (India), DST (India), IPM (Iran), SFI (Ireland), INFN (Italy), MSIP (Republic of Korea), NRF (Republic of Korea), LAS (Lithuania), MOE (Malaysia), UM (Malaysia), CINVESTAV (Mexico), CONACYT (Mexico), SEP (Mexico), UASLP-FAI (Mexico), MBIE (New Zealand), PAEC (Pakistan), MSHE (Poland), NSC (Poland), FCT (Portugal), JINR (Dubna), MON (Russia), RosAtom (Russia), RAS (Russia), RFBR (Russia), MESTD (Serbia), SEIDI (Spain), CPAN (Spain), Swiss Funding Agencies (Switzerland), MST (Taipei), ThEPCenter (Thailand), IPST (Thailand), STAR (Thailand), NSTDA (Thailand), TUBITAK (Turkey), TAEK (Turkey), NASU (Ukraine), SFFR (Ukraine), STFC (United Kingdom), DOE (USA), NSF (USA), Marie-Curie programme, European Research Council, EPLANET (European Union), Leventis Foundation, A.P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Federal Science Policy Office, Fonds pour la Formation a la Recherche dans lIndustrie et dans lAgriculture (FRIA-Belgium), Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium), Ministry of Education, Youth and Sports (MEYS) of the Czech Republic, Council of Science and Industrial Research, India, HOMING PLUS programme of the Foundation for Polish Science, European Union, Regional Development Fund, Compagnia di San Paolo (Torino), Consorzio per la Fisica (Trieste), MIUR (Italy) [20108T4XTM], Thalis programme, Aristeia programme, EU-ESF, Greek NSRF, National Priorities Research Programme by Qatar National Research Fund, Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand), Welch Foundation

DOI: 10.1016/j.physletb.2015.12.039

ISSN: 0370-2693; 1873-2445

WoS: 000368783600052

Scopus: 2-s2.0-84952801806

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TY  - JOUR
AU  - Khachatryan, V.
AU  - Adzic, R.
AU  - Ekmedzic, M.
AU  - Milošević, Jovan
AU  - Rekovic, V.
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/906
AB  - 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 8TeV, 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 LT m(ll gamma) LT 150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H - GT gamma*gamma - GT 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(-1.8)(+2.8)) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H - GT (J/psi)gamma for the 125 GeV Higgs boson is set at 1.5 x10(-3). (C) 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/).
T2  - Physics Letters B
T1  - Search for a Higgs boson decaying into gamma*gamma - GT ll gamma with low dilepton mass in pp collisions at root s=8 TeV
VL  - 753
SP  - 341
EP  - 362
DO  - 10.1016/j.physletb.2015.12.039
ER  -

@article{
author = "Khachatryan, V. and Adzic, R. and Ekmedzic, M. and Milošević, Jovan and Rekovic, V. and Đorđević, Miloš and Milenović, Predrag",
year = "2016",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/906",
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 (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 8TeV, 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 LT m(ll gamma) LT 150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H - GT gamma*gamma - GT 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(-1.8)(+2.8)) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H - GT (J/psi)gamma for the 125 GeV Higgs boson is set at 1.5 x10(-3). (C) 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/).",
journal = "Physics Letters B",
title = "Search for a Higgs boson decaying into gamma*gamma - GT ll gamma with low dilepton mass in pp collisions at root s=8 TeV",
volume = "753",
pages = "341-362",
doi = "10.1016/j.physletb.2015.12.039"
}

Khachatryan V, Adzic R, Ekmedzic M, Milošević J, Rekovic V, Đorđević M, Milenović P. Search for a Higgs boson decaying into gamma*gamma - GT ll gamma with low dilepton mass in pp collisions at root s=8 TeV. Physics Letters B. 2016;753:341-362

Khachatryan, V., Adzic, R., Ekmedzic, M., Milošević, J., Rekovic, V., Đorđević, M.,& Milenović, P. (2016). Search for a Higgs boson decaying into gamma*gamma - GT ll gamma with low dilepton mass in pp collisions at root s=8 TeV.
Physics Letters B, 753, 341-362.
https://doi.org/10.1016/j.physletb.2015.12.039

Khachatryan V., Adzic R., Ekmedzic M., Milošević Jovan, Rekovic V., Đorđević Miloš, Milenović Predrag, "Search for a Higgs boson decaying into gamma*gamma - GT ll gamma with low dilepton mass in pp collisions at root s=8 TeV" 753 (2016):341-362,
https://doi.org/10.1016/j.physletb.2015.12.039 .