Question

What is the largest decay mode for a Standard Model higgs of mass 500 GeV? 180 GeV? 115 GeV?

Answer 1

In the low mass range, 115GeV, the major decay mode is bottom quark /antiquark pair (more than 84%), About 8% is and remaining is . So the largest decay mode is bottom quark /antiquark pair.

For masses higher that 140GeV, The major decay mode is WW gauge boson.

For Mass of 500 GeV, which is a very large mass, the major decay modes are WW and ZZ particles.It is approximately 2/3 rd of WW, and 1/3 of ZZ gauge bosons.

For 180 GeV mass, The decay modes are 95% WW and 5% ZZ gauge bosons