Search for anomalous single top quark production in association with a photon in pp collisions at root s=8 TeV

V. Khachatryan; Petar Adžić; Jovan Milošević; V. Rekovic; Miloš Đorđević; Predrag Milenović; CMS Collaboration; Yasar Onel

doi:10.1007/JHEP04(2016)035

Made available in DSpace on 2018-11-27T12:45:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-04-06 BMWFW (Austria) FWF (Austria) FNRS (Belgium) FWO (Belgium) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) 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 (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 (U.S.A.) NSF (U.S.A.) Marie-Curie program (European Union) European Research Council (European Union) 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 l'Industrie et dans l'Agriculture (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 program of the Foundation for Polish Science European Union, Regional Development Fund OPUS program of the National Science Center (Poland) Compagnia di San Paolo (Torino) MIUR (Italy) EU-ESF Greek NSRF National Priorities Research Program, Qatar National Research Fund Rachadapisek Sompot Fund, Chulalongkorn University (Thailand) Welch Foundation Science and Technology Facilities Council The result of a search for flavor changing neutral currents (FCNC) through single top quark production in association with a photon is presented. The study is based on proton-proton collisions at a center-of-mass energy of 8 TeV using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fb(-1). The search for t gamma events where t -> Wb and W -> mu nu is conducted in final states with a muon, a photon, at least one hadronic jet with at most one being consistent with originating from a bottom quark, and missing transverse momentum. No evidence of single top quark production in association with a photon through a FCNC is observed. Upper limits at the 95% confidence level are set on the tu gamma and tc gamma anomalous couplings and translated into upper limits on the branching fraction of the FCNC top quark decays: B (t -> u gamma) < 1.3 x 10(-4) and B(t -> c gamma) < 1.7 x 10(-3). Upper limits are also set on the cross section of associated t gamma production in a restricted phase-space region. These are the most stringent limits currently available. 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Search for anomalous single top quark production in association with a photon in pp collisions at root s=8 TeV

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