The right top coupling in the aligned two-Higgs-doublet model
  We compute the right top quark coupling in the aligned two-Higgs-doublet model. In the Standard Model the real part of this coupling is dominated by QCD-gluon-exchange diagram, but the imaginary part, instead, is purely electroweak at one loop. Within this model we show that values for the imaginary part of the coupling up to one order of magnitude larger than the electroweak prediction can be obtained. For the real part of the electroweak contribution we find that it can be up to three orders of magnitude larger than the standard model one. We also present detailed results of the one loop analytical computation. 
Cesar Ayala, Gabriel A. Gonz\'alez-Sprinberg, R. Martinez and Jordi   Vidal
hep-ph