Rare top decay $t\to c\gamma$ in general THDM-III

Abstract

We study the decay $t\to c\gamma$ with flavor-changing neutral interactions in scalar sector of the type III Two Higgs Doublet Model (THDM-III) with mixing between neutral scalar fields as a result of considering the most general scalar potential. The branching ratio of the decay $Br(t\to c\gamma )$ is calculated as function of the mixing parameters and masses of the neutral scalar fields. We obtain a $Br(t\to c\gamma )$ of the order of $10^{-8}$ for the considered regions of the mixing parameters. Finally, one upper bound for the possible events is estimated to be $n=18$ by assuming a expected luminosity of the order of 300 $f{b}^{-1}$.

Comments: 7 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1312.0044