TY - JOUR
T1 - CP asymmetry in B0(t)→KSπ0γ in the standard model
AU - Grinstein, Benjamín
AU - Pirjol, Dan
PY - 2006/1/1
Y1 - 2006/1/1
N2 - The time-dependent CP asymmetry in exclusive B0(t)→K*0γ 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 B0(t)→KSπ0γ and B0(t)→π+π-γ. 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→sγ has high left-handed polarization, but right-handed contamination enters already at leading order in Λ/mb even for vanishing light quark masses. We compute here the magnitude of this effect and the time-dependent CP asymmetry parameter SKSπ0γ. 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.
AB - The time-dependent CP asymmetry in exclusive B0(t)→K*0γ 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 B0(t)→KSπ0γ and B0(t)→π+π-γ. 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→sγ has high left-handed polarization, but right-handed contamination enters already at leading order in Λ/mb even for vanishing light quark masses. We compute here the magnitude of this effect and the time-dependent CP asymmetry parameter SKSπ0γ. 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.
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U2 - 10.1103/PhysRevD.73.014013
DO - 10.1103/PhysRevD.73.014013
M3 - Article
AN - SCOPUS:32644484709
SN - 1550-7998
VL - 73
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 1
M1 - 014013
ER -