CMS-PAS-TOP-14-003

CMS-PAS-TOP-14-003
Search for anomalous single top quark production in
CMS Collaboration
2014

Abstract: A search for single top quark production through flavor-changingneutral currents in the anomalous $tq\gamma$ vertex is presented in proton-proton collisions at a center-of-mass energy of 8 TeV. The analysis is based on a data-set corresponding to an integrated luminosity of 19.1 fb $^{-1}$ collected with the CMS detector. The search is performed on events with one isolated muon and jets in the final state. No evidence for a signal is observed. Upper limits on the strengths of the anomalous couplings at leading order for vertices involving a top quark, a photon, and another up-like quark are set at \% $confidence level to be$ \kappa_{tu\gamma}<0.028 $and$ \kappa_{tc\gamma}<0.094 $. The corresponding upper bounds on the top quark decay branching ratios are$ BR(t\rightarrow u+\gamma)<0.0161\% $and$ BR(t\rightarrow c+\gamma)<0.182\%$.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; Figures are available from the CDS record. These preliminary results are superseded in this paper, JHEP 04 (2016) 035.

Compact Muon Solenoid
LHC, CERN