Search for anomalous tq$\gamma$ FCNC Couplings in direct single top quark production at the LHC

Abstract

In this paper we propose and study direct single top quark production channel for probing the tq$\gamma$ flavor-changing neutral current (FCNC) interactions at the LHC. We reinterpret the experimental results of a search for direct single top quark production performed by ATLAS collaboration at 8 TeV to set upper bounds on the FCNC top quark decay branching fractions through the proposed channel, resulting in $\mathcal{B}$(t$\to$ u$\gamma$) $<$ 0.05\% and $\mathcal{B}$(t$\to$ c$\gamma$) $<$ 0.14\%. Finally, the expected sensitivity at 13 TeV for various integrated luminosity scenarios is estimated.

Comments: Presented at '9th International Workshop on Top Quark Physics', Olomouc, Czech Republic, September 19-23 (2016). Complete paper can be found in arXiv:1609.04838