Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-06-16
Phys.Rev. D72 (2005) 055018
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 6 figures, uses axodraw.sty, minor correction in few sentences, one equatin and 3 references added. To be published
Scientific paper
10.1103/PhysRevD.72.055018
The nonzero widths of heavy particles become significant when they appear in the final state of any decay occurring just around its kinematical threshold. To take into account such effects, a procedure, called the convolution method, was proposed by Altarelli, Conti and Lubicz. We expand their study which included only threshold effects for t-> bWZ in the standard model. We discuss finite width effects in the three body decays t-> cWW,cZZ and A^0(h^0)->tbW in the type III version of a two Higgs doublet model. In particular, we find a substantial enhancement in the decay t->cZZ, which brings its branching ratio to BR(t->cZZ)~10^-3, and in the decay A^0->tbW, which, unlike the h^0 case, becomes competitive with the A^0 two-body decay modes.
Bar-Shalom Shaouly
Eilam Gad
Frank Mariana
Turan Ismail
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