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

The CMS collaboration
JHEP 1604 (2016) 035, 2016

Abstract (data abstract)
CERN-LHC. 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 $\rightarrow$ 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 $\rightarrow u \gamma$) < 1.3$\times$10$^{-4}$ and B(t $\rightarrow c \gamma$) < 1.7$\times$10$^{-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.

  • Table 1

    Data from Page 9 of preprint, table 1

    10.17182/hepdata.70010.v1/t1

    The expected and observed $95\%$ CL upper limits on the FCNC $tu\gamma$ and $tc\gamma$ cross sections times branching fraction, the...

  • Table 2

    Data from Page 9 of preprint, table 1

    10.17182/hepdata.70010.v1/t2

    The expected and observed $95\%$ CL upper limits on the FCNC $tu\gamma$ and $tc\gamma$ cross sections times branching fraction, the...

  • Table 3

    Data from Page 11 of preprint, table 3

    10.17182/hepdata.70010.v1/t3

    Upper limits on the signal cross sections are also determined for a restricted phase-space region in which the detector is...

  • Table 4

    Data from Page 11 of preprint, table 4

    10.17182/hepdata.70010.v1/t4

    For the tu$\gamma$ signal channel, the total number of observed selected events in the data (N$_{obs}$), the SM expectations (N$_{SM}$),...

  • Table 5

    Data from Page 11 of preprint, table 4

    10.17182/hepdata.70010.v1/t5

    For the tc$\gamma$ signal channel, the total number of observed selected events in the data (N$_{obs}$), the SM expectations (N$_{SM}$),...

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