摘要
Rare decays in flavor physics often suffer from Helicity suppress and Loop suppress.Helicity flip is a direct consequence of chiral Ue3T symmetry breaking and electroweak symmetry breaking.The identical feature is also shared by the mass generation of SM fermions.In this review,we use the Minimal Supersymmetric Standard Model(MSSM)as an example to illustrate an explicit connection between bottom Yukawa coupling and rare decay process of b!sc.We take a symmetry approach to study the common symmetry breaking in supersymmetric correction to bottom quark mass generation and b!sc.We show that Large Peccei-Quinn symmetry breaking effect and R-symmetry breaking effect required by b!sc inevitably lead to significant reduction of bottom Yukawa yb.To compromise the reduction in b b,a new decay is also needed to keep the Higgs total width as the SM value.
Rare decays in flavor physics often suffer from Helicity suppress and Loop suppress. Helicity flip is a direct consequence of chiral U（3） symmetry breaking and electroweak symmetry breaking. The identical feature is also shared by the mass generation of SM fermions. In this review, we use the Minimal Supersymmetric Standard Model （MSSM） as an example to illustrate an explicit connection between bottom Yukawa coupling and rare decay process of b → sγ. We take a symmetry approach to study the common symmetry breaking in supersymmetric correction to bottom quark mass generation and b→sγ. We show that Large Peccei-Quinn symmetry breaking effect and R-symmetry breaking effect required by b →sγ inevitably lead to significant reduction of bottom Yukawa Yb. To compromise the reduction in bb, a new decay is also needed to keep the Higgs total width as the SM value.
基金
supported by the Zhejiang University Fundamental Research Funds for the Central Universities (2011QNA3017)
the National Natural Science Foundation of China (11245002,11275168,11075139 and 11135006)
Program for New Century Excellent Talents in University
