The photon polarization in B -> X gamma in the standard model

Details The photon polarization in B -> X gamma in the standard model The photon polarization in B -> X gamma in the standard model

2004-12-02

arxiv.org/abs/hep-ph/0412019v2

Phys.Rev. D71 (2005) 011504

Physics

High Energy Physics

High Energy Physics - Phenomenology

Clarifications in the exclusive section, references added

Scientific paper

10.1103/PhysRevD.71.011504

The standard model prediction for the $B\to X_{s,d}\gamma$ decay amplitude with a right-handed photon is believed to be tiny, suppressed by $m_{s,d}/m_b$, compared to the amplitude with a left-handed photon. We show that this suppression is fictitious: in inclusive decays, the ratio of these two amplitudes is only suppressed by $g_s/(4\pi)$, and in exclusive decays by $\Lambda_{QCD}/m_b$. The suppression is not stronger in $B\to X_d\gamma$ decays than it is in $B\to X_s\gamma$. We estimate that the time dependent CP asymmetries in $B\to K^*\gamma$, $\rho\gamma$, $K_S\pi^0\gamma$, and $\pi^+\pi^-\gamma$ are of order 0.1 and that they have significant uncertainties.

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