Rare top decay t → c γ with flavor changing neutral scalar interactions in two Higgs doublet model

Models beyond the standard model with extra scalars have been highly motivated by the recent discovery of the Higgs boson. The two Higgs doublet model type III considers the most general case for the scalar potential, allowing mixing between neutral CP-even and CP-odd scalar fields. This work presents the results of the study on the t→cγ decay at one loop level if neutral flavor changing is generated by top-charm-Higgs coupling given by the Yukawa matrix. For instance, a value for the branching ratio Br(t→cγ)∼10−6 for tanβ=2.5 and general neutral Higgs mixing parameters, 1.16≤α1≤1.5, −0.48≤α2≤−0.1. The number of events for the t→cγ decay with an integrated luminosity of 300 fb−1 is estimated as 10≲NEff≲100 for the parameters of the model constrained by experimental data.