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# Search for anomalous single top quark production in association with a photon in pp collisions at $\sqrt{s}=8$ TeV

Submit Time: 2016-09-12
Author:
Institute: 1.CMS Collaboration;

## Abstracts

 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.
Recommended references： Khachatryan, Vardan and others.(2016).Search for anomalous single top quark production in association with a photon in pp collisions at $\sqrt{s}=8$ TeV.[ChinaXiv:201609.00790] (Click&Copy)
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