By: C.P. Yuan
From: Department of Physics and Astronomy, Michigan State University, USA
At: Complexo Interdisciplinar, Anfiteatro
I will show that in the Minimal Supersymmetric Standard Model(MSSM),the possibility for the lightest CP-even Higgs boson to be lighter than Z boson (as low as about 60 GeV) is, contrary to the usual belief, not yet excluded by LEP2 Higgs search nor any direct searches for supersymmetric particles at high energy colliders. The characteristic of the light Higgs boson scenario (LHS) is that the ZZh coupling and the decay branching ratio Br(h/A → b b) are simultaneously suppressed as a result of generic supersymmetric loop corrections. Consequently, the W+- H-+ h coupling has to be large due to the sum rule of Higgs couplings to weak gauge bosons. I will also discuss the potential of the Tevatron and B-factories to test the LHS, and show that the associate neutral and charged Higgs boson production process, pp → H+- h (A), can completely probe the LHS at the CERN LHC.