2 research outputs found
Rare three-body decay t -> c h gamma in the standard model and the two-Higgs doublet model
A complete calculation of the rare three-body decay t --> c h gamma is
presented in the framework of the standard model. In the unitary gauge, such a
calculation involves about 20 Feynman diagrams. We also calculate this decay in
the general two-Higgs doublet model (model III), in which it arises at the
tree-level. While in the standard model the decay t --> c h gamma is extremely
suppressed, with a branching fraction of the order of for a Higgs
boson mass of the order of 115 GeV, in the model III it may have a branching
ratio up to . We also discuss the crossed decay h --> b \bar{s} gamma.Comment: Updated to match published versio