The photon polarization in b -> X gamma in the standard model
The standard model prediction for the {bar B}{sup 0} {yields} X{sub s,d}{gamma} decay amplitude with a right-handed photon is believed to be tiny, suppressed by m{sub s,d}/m{sub 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{sub s}/(4{pi}), and in exclusive decays by {Lambda}{sub QCD}/m{sub b}. The suppression is not stronger in {bar B}{sup 0} {yields} X{sub d}{gamma} decays than it is in {bar B}{sup 0} {yields} X{sub s}{gamma}. We estimate that the time dependent CP asymmetries in B {yields} K*{gamma}, {rho}{gamma}, K{sub S}{pi}{sup 0}{gamma}, and {pi}{sup +}{pi}{sup -} {gamma} are of order 0.1 and that they have significant uncertainties.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of High Energy Physics Contracts DE-AC03-76SF00098 and DE-FG03-97ER40546; National Science Foundation Grant PHY-9970781 (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 841791
- Report Number(s):
- LBNL-56648; R&D Project: PTHOPS; TRN: US0502749
- Journal Information:
- Physical Review D, Vol. 71; Other Information: Submitted to Physical Review D: Volume 71; Journal Publication Date: 2005; PBD: 8 Dec 2004
- Country of Publication:
- United States
- Language:
- English
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