Mixing-induced CP Asymmetries in Radiative B Decays in and beyond the Standard Model

Details Mixing-induced CP Asymmetries in Radiative B Decays in and beyond the Standard Model Mixing-induced CP Asymmetries in Radiative B Decays in and beyond the Standard Model

1997-04-09

arxiv.org/abs/hep-ph/9704272v1

Phys.Rev.Lett. 79 (1997) 185-188

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages + 1 figure.ps

Scientific paper

10.1103/PhysRevLett.79.185

In the Standard Model (SM) the photon in radiative $\bar B^0$ and $\bar B_s$ decays is predominantly left-handed. Thus, mixing induced CP asymmetries in $b\to s\gamma$ and $b\to d\gamma$ are suppressed by $m_s/m_b$ and $m_d/m_b$, respectively, and are very small. In many extensions of the SM, such as the left-right symmetric model (LRSM), SU(2)xU(1) models with exotic fermions and SUSY, the amplitude of right-handed photons grows proportional to the virtual heavy fermion mass, which can lead to large asymmetries. As an example, in the LRSM, asymmetries larger than 50% are possible even when radiative decay rate measurements agree with SM predictions.

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