Time dependent CP asymmetry in $B^0 \to ρ^0 γ$ decay to probe the origin of CP violation

Details Time dependent CP asymmetry in $B^0 \to ρ^0 γ$ decay to probe the origin of CP violation Time dependent CP asymmetry in $B^0 \to ρ^0 γ$ decay to probe the origin of CP violation

2004-10-26

arxiv.org/abs/hep-ph/0410343v1

Phys.Rev. D71 (2005) 054014

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 4 eps figures

Scientific paper

10.1103/PhysRevD.71.054014

Since the CP violation in the $B$ system has been investigated up to now only through processes related to the $B$--$\bar{B}$ mixing, urgently required is new way of study for the CP violation and establishing its origin in the $B$ system independent of the mixing process. In this work, we explore the exclusive $ B^0 \to \rho^0 \gamma$ decay to obtain the time-dependent CP asymmetry in $b \to d$ decay process in the standard model and the supersymmetric model. We find that the complex RL and RR mass insertion to the squark sector in the MSSM can lead to a large CP asymmetry in $b \to d \gamma$ decay through the gluino-squark diagrams, which is not predicted in the Standard Model induced by the $B$--$\bar{B}$ mixing.

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