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

C. S. Kim·Yeong Gyun Kim·Kang Young Lee
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Abstract

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 ρ^0 γ$ 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 $b \to d γ$ 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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C. S. Kim, Yeong Gyun Kim, Kang Young Lee. 2004-10-26. Time dependent CP asymmetry in $B^0 \to ρ^0 γ$ decay to probe the origin of CP violation. https://doi.org/10.1103/physrevd.71.054014

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