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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.
Yerevan Phys Inst, Yerevan 375036, Armenia
Inst Hochenergiephys OeAW, Vienna, Austria
Natl Ctr Particle & High Energy Phys, Minsk, Byelarus
Univ Antwerp, B-2020 Antwerp, Belgium
Vrije Univ Brussel, Brussels, Belgium
Univ Libre Bruxelles, Brussels, Belgium
Univ Ghent, B-9000 Ghent, Belgium
Catholic Univ Louvain, Louvain La Neuve, Belgium
Univ Mons, B-7000 Mons, Belgium
Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil
Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil
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Univ Fed ABC, Sao Paulo, Brazil
Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria
Univ Sofia, BU-1126 Sofia, Bulgaria
Inst High Energy Phys, Beijing 100039, Peoples R China
Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
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Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia
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Rudjer Boskovic Inst, Zagreb, Croatia
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Charles Univ Prague, Prague, Czech Republic
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Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France
Georgian Tech Univ, Tbilisi, Georgia
Tbilisi State Univ, GE-380086 Tbilisi, Georgia
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DESY, Hamburg, Germany
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