# Search for anomalous single top quark production in association with a photon in pp collisions at sqrt(s) = 8 TeV

Abstract : 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 inverse femtobarns. The search for t gamma events where t to Wb and W to 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 to u gamma) < 1.3E-4 and B(t to c gamma) < 1.7E-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.
Type de document :
Article dans une revue
Journal of High Energy Physics, Springer Verlag (Germany), 2016, 04, pp.035. 〈10.1007/JHEP04(2016)035〉

http://hal.in2p3.fr/in2p3-01228467
Contributeur : Dominique Girod <>
Soumis le : vendredi 13 novembre 2015 - 10:53:58
Dernière modification le : jeudi 8 février 2018 - 11:07:30

### Citation

V. Khachatryan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Search for anomalous single top quark production in association with a photon in pp collisions at sqrt(s) = 8 TeV. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 04, pp.035. 〈10.1007/JHEP04(2016)035〉. 〈in2p3-01228467〉

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