摘要
We investigate the leading SUSY-QCD contributions to the branch ratio(BR)oft→ch^0 within the context of the minimal supersymmetric standard model(MSSM) with coplex parameters,assuming more generally that there is a misalignment between the squark and quark that leads to a flavor non-diagonal squark mass matrix.We introduce complex phases only in μ and At,namelyФμ and ФAq,for simplicity,and study the dependence of the BRoft→ch^0on these phase parameters.Our calculations show that these CP-violation phases and the flavor mixing parameter λinfluence the BR oft→ch^0 considerably,and the effect induced by ФAt is much larger than that byФμ and ФAc1u.For diffrent values of the complex parameters μand At that are set in this paper,the BR oft→ch^0is in the range of 10^-7—10^-6,depending mainly on the value of the trilinear coupling
We investigate the leading SUSY-QCD contributions to the branch ratio (BR) oft→ch~0 within the context of the minimal supersymmetric standard model (MSSM) with complex parameters,assuming more generally that there is a misalignment between the squark and quark that leads to a flavor non-diagonal squark mass matrix.We introduce complex phases only in μ and At,namely φ_μ and φ_(Aq),for simplicity,and study the dependence of the BR of t→ch~0 on these phase parameters.Our calculations show that these CP-violation phases and the flavor mixing parameter λ influence the BR oft→ch~0 considerably,and the effect induced by φ_(At) is much larger than that by φ_μ and φ_(Ac(?)u.For different values of the complex parameters μ and A_t that are set in this paper,the BR of t -+ ch~ is in the range of 10~(-7)～10~(-6),depending mainly on the value of the trilinear coupling A_t.
基金
The project supported in part by National Natura Science Foundation of China and a grant from the University of Science and Technology of China
