CP asymmetry in B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} in the standard model
- Department of Physics, University of California at San Diego, La Jolla, California 92093 (United States)
The time-dependent CP asymmetry in exclusive B{sup 0}(t){yields}K*{sup 0}{gamma} decays has been proposed as a probe of new physics in B decays. Recently, this method was extended to radiative decays into multibody hadronic final states such as B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} and B{sup 0}(t){yields}{pi}{sup +}{pi}{sup -}{gamma}. The CP asymmetry in these decays vanishes to the extent that the photon is completely polarized. In the standard model, the photon emitted in b{yields}s{gamma} has high left-handed polarization, but right-handed contamination enters already at leading order in {lambda}/m{sub b} even for vanishing light quark masses. We compute here the magnitude of this effect and the time-dependent CP asymmetry parameter S{sub K{sub S}}{sub {pi}}{sub {sup 0}}{sub {gamma}}. We find that the standard model can easily accommodate values of S as large as 10%, but a precise value cannot be obtained at present because of strong interactions uncertainties.
- OSTI ID:
- 20774598
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 1; Other Information: DOI: 10.1103/PhysRevD.73.014013; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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