Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-09-24
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, Latex2e, 3 figures included. Updated talk presented in: International Workshop on Linear Colliders, Sitges, April 28-
Scientific paper
Flavour changing neutral decays of the top quark are know to be extremely suppressed in the SM. This is especially so for the top quark decay into the SM Higgs boson, whose rate is less than 10^-13. However, it turns out that the decay modes t->c h, with h= h^0,H^0,A^0 any of the MSSM neutral Higgs bosons, can be much more gifted. In particular, the rate into the lightest CP-even Higgs boson h^0 -- which is an accessible decay mode across the whole MSSM parameter space -- is generally higher than the decay into glue, t->c g, even though the latter can also be considerably augmented in the MSSM. Our general conclusion is that the Higgs channel t->c h^0 can be the ``gold-plated'' top quark FCNC decay mode in the MSSM with rates that can reach 10^-4, i.e. already at the visible level for both LHC and LC.
Guasch Jaume
Sola Joan
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