Time-dependentCPasymmetry inB0→ρ0γdecay to probe the origin ofCP

Abstract

Since the CP violation in the B system has been investigated up to now only through processes related to the B-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 → ρ 0 γ decay to obtain the time-dependent CP asymmetry in b → 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 → dγ decay through the gluino-squark diagrams, which is not predicted in the Standard Model induced by the B-B mixing.