Direct CP Asymmetry of B -> X_d γin the effective SUSY model

Details Direct CP Asymmetry of B -> X_d γin the effective SUSY model Direct CP Asymmetry of B -> X_d γin the effective SUSY model

2001-03-12

arxiv.org/abs/hep-ph/0103120v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

To appear in the proceedings of BCP4, Ise 2001. The original conference poster is available at http://www-th.kek.jp/home/stefa

Scientific paper

We investigate the effect of supersymmetric CP violating phases on the inclusive decay B\to X_d\gamma. Although such a decay contains a large background from B\to X_s\gamma, if isolated it may exhibit sizeable CP violation, both in the Standard Model (SM) and in the context of models beyond the SM. With unconstrained supersymmetric CP violating phases we show that the direct CP asymmetry (A_CP) lies in the region -40% \le A_CP \le 40%, where a positive asymmetry would constitute a clear signal of physics beyond the SM. Even if a direct measurement of B\to X_d\gamma proves too dif ficult experimentally, its asymmetry contributes non-negligibly to the measurements of A_CP for B\to X_s\gamma, and thus should be included in future analyses. We show t hat there may be both constructive and destructive interference between A^d\gamma_CP and A^s\gamma_CP.

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