Effect of supersymmetric CP phases on the B→Xsγ and B→Xsl+l− decays in the minimal supergravity model
Effect of supersymmetric CP phases on the B→Xsγ and B→Xsl+l− decays in the minimal supergravity model
复制标题
超对称 CP 相对 B→Xsγ 和 B→Xsl+l− 的影响在最小超重力模型中衰减
DOI：
10.1016/s0370-2693(99)00787-x
复制
发表时间：
1998
影响因子：
4.4
通讯作者：
Y. Shimizu
中科院分区：
文献类型：
--
作者：
T. Goto;Y. Keum;Takeshi Nihei;Y. Okada;Y. Shimizu
研究了超对称CP违背相对最小超重力模型中B→Xsγ和B→Xsl+l−衰变的影响。我们发现，由于从普朗克尺度到电弱尺度的重整化效应，顶夸克的三线性标量耦合常数的相位被强烈抑制并与高介子质量的相位对齐。结果表明，考虑到中子和电子电偶极矩约束，超对称CP违背相对B→Xsγ和B→Xsl+l−衰变的影响很小。对于B→Xsγ衰变，振幅几乎没有新的CP违背相，直接CP不对称小于2%。对于B→Xsl+l−衰变，只有当B→Xsγ振幅的符号与标准模型相反时，分支比才会与标准模型中的分支比有较大的不同。
We investigate the effect of supersymmetric CP violating phases on the B→Xsγ and B→Xsl+l−decays in the minimal supergravity model. We show that the phase of the trilinear scalar coupling constant for top squarks is strongly suppressed and aligned to that of the gaugino mass due to a renormalization effect from the Planck scale to the electroweak scale. As a result, the effect of supersymmetric CP violating phases on the B→Xsγ and B→Xsl+l−decays are small taking into account the neutron and the electron electric dipole moment constraints. For the B→Xsγ decay, the amplitude has almost no new CP violating phase and the direct CP asymmetry is less than 2%. For the B→Xsl+l−decay, the branching ratio can be sizably different from that in the standard model only when the sign of the B→Xsγ amplitude is opposite to that in the standard model.