Farrington, Sinead, Harrison, P. F., Janus, M., Jeske, C., Jones, G. (Graham), Martin, T. A., Murray, W. and Pianori, E. (2014) Search for top quark decays t → qH with H → γγ using the ATLAS detector. Journal of high energy physics, Volume 2014 (Number 6). Article number 008. doi:10.1007/JHEP06(2014)008

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Abstract

A search is performed for flavour-changing neutral currents in the decay of a top quark to an up-type (c, u) quark and a Higgs boson, where the Higgs boson decays to two photons. The proton-proton collision data set used corresponds to 4.7 fb-1 at √ = 7TeV and 20.3fb-1 at √ = 8TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for in which one top quark decays to qH and the other decays to bW. Both the hadronic and the leptonic decay modes of the W boson are used. No significant signal is observed and an upper limit is set on the t → qH branching ratio of 0.79 at the 95% confidence level. The corresponding limit on the tqH coupling combination λtcH 2 + λtuH 2 is 0.17.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Quarks -- Decay, Particles (Nuclear physics) -- Flavor
Journal or Publication Title:	Journal of high energy physics
Publisher:	Springer
ISSN:	1029-8479
Official Date:	3 June 2014
Dates:	Date Event 3 June 2014 Published 7 May 2014 Accepted 26 March 2014 Submitted
Volume:	Volume 2014
Number:	Number 6
Number of Pages:	39
Article Number:	Article number 008
Identifier:	10.1007/JHEP06(2014)008
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	European Organization for Nuclear Research (CERN), Agencia Nacional de Promoción Científica y Tecnológica (Argentina), Yerevan Physics Institute (Armenia), Australian Research Council (ARC), Austria. Bundesministerium für Wissenschaft und Forschung [Federal Ministry of Education, Science and Culture], Fonds zur Förderung der Wissenschaftlichen Forschung (Austria) (FWF), Azärbaycan Milli Elmlär Akademiyası, Belarus.‏ ‎Gosudarstvennyĭ komitet po nauke i tekhnologii︠a︡m‏, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Natural Sciences and Engineering Research Council of Canada (NSERC), National Research Council Canada (NRCC), Canada Foundation for Innovation (CFI), Chile. Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Zhongguo ke xue yuan [Chinese Academy of Sciences] (CAS), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), China. Guo jia ke xue ji shu bu [Ministry of Science and Technology], Fondo Colombiano de Investigaciones Científicas y Proyectos Especiales Francisco José de Caldas (COLCIENCIAS), VSC CR (Czech Republic), Czech Republic. Ministerstvo školství, mládeže a tělovýchovy [Ministry of Education, Youth, and Sport], Czech Republic.‏ ‎Ministerstvo průmyslu a obchodu‏ [Ministery of Industry and Trade] (MPO), Lundbeck Foundation, Danmarks Grundforskningsfond [Danish National Research Foundation], Statens naturvidenskabelige forskningsråd (Denmark) [Natural Science Research Council], European Particle physics Latin American NETwork (EPLANET), European Research Council (ERC), Institut national de physique nucléaire et de physique des particules (IN2P3), Centre national de la recherche scientifique (France) (CNRS), France. Commissariat à l'énergie atomique (CEA), Sakʻartʻvelos mecʻnierebatʻa erovnuli akademia [Georgian National Academy of Sciences] (GNAS), Germany. Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Max-Planck-Gesellschaft zur Förderung der Wissenschaften [Max Planck Society for the Advancement of Science], Alexander von Humboldt-Stiftung (AvHS), Greece. General Secretariat of Research and Technology, Israel Science Foundation (ISF), Minerva Stiftung, German-Israeli Foundation for Scientific Research and Development, Israeli Centers of Research Excellence (I-CORE), Benoziyo Center (Israel), Istituto nazionale di fisica nucleare (INFN), Japan. Monbu Kagakushō [Japan. Ministry of Education, Culture, Sports, Science and Technology] (MK), Nihon Gakujutsu Shinkōkai [Japan Society for the Promotion of Science] (NGS), Centre national pour la recherche scientifique et technique (Morocco), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), Norges forskningsråd [Norwegian Research Council], BRF (Norway), Poland. Ministerstwo Nauki i Szkolnictwa Wyższego [Ministry of Science and Higher Education] (MNiSW), Narodowe Centrum Nauki (NCN), Portugal.‏ Ministério da Ciência, da Inovação e do Ensino Superior, Fundação para a Ciência e a Tecnologia (FCT), Romania.‏ Ministerul Educației Naționale‏ (MNE), Institutul de Fizică Atomică (IFA), Russia (Federation). Ministerstvo obrazovanii︠a︡ [Ministry of Education], Federalʹnoe agentstvo po atomnoĭ ėnergii (Russia), Serbia. Joint Institute for Nuclear Research (JINR), Serbia. Ministarstvo prosvete i sporta‏ [Ministry of Education] (MSTD), Slovenia. Ministerstvo Spravodlivosti Slovenskej Republiky, Slovenian Research Agency, Slovenia.‏ Ministrstvo za šolstvo, znanost in šport‏, South Africa. Department of Science and Technology, National Research Foundation (South Africa) (NRF), Spain. Ministerio de Economía y Competitividad [Ministry of Economy and Competitiveness] (MINECO), Sweden. Vetenskapsrådet [Research Council], Knut och Alice Wallenbergs Stiftelse (Sweden), Switzerland. Staatssekretariat für Ausbildung und Forschung (SER), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Bern (Switzerland : Canton), Türkiye Atom Enerjisi Kurumu (TAEK), Geneva (Switzerland : Canton), China. Guo jia ke xue ji shu bu [Ministry of Science and Technology], National Strategic Research Framework (Greece), Science and Technology Facilities Council (Great Britain) (STFC), Royal Society (Great Britain), Leverhulme Trust (LT), United States. Department of Energy, National Science Foundation (U.S.) (NSF)

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