1999/09/24 by Jaume Guasch, Guasch, Jaume, Joan Solà +2
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9909503
8 pages, Latex2e, 3 figures included. Updated talk presented in: International Workshop on Linear Colliders, Sitges, April 28-May 5, 1999; to appear in the proceedings
arxiv created 1999/09/24 · openalex publication_date 1999/09/24 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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= h0,H0,A0 any of the MSSM neutral Higgs bosons, can be much more gifted. In particular, the rate into the lightest CP-even Higgs boson h0 -- 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 h0 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.