TY - JOUR
T1 - Photon polarization in B → Xγ in the standard model
AU - Grinstein, Benjamín
AU - Grossman, Yuval
AU - Ligeti, Zoltan
AU - Pirjol, Dan
PY - 2005/1
Y1 - 2005/1
N2 - The standard model prediction for the B̄0 → X s,dγ decay amplitude with a right-handed photon is believed to be tiny, suppressed by ms,d/mb, 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/(4π), and in exclusive decays by ΔQCD/m b. The suppression is not stronger in B̄0 → Xdγ decays than it is in B̄0 → X sγ. We estimate that the time dependent CP asymmetries in B → K*γ, ργ, Ksπ0γ, and π+π-γ are of order 0.1 and that thev have significant uncertainties.
AB - The standard model prediction for the B̄0 → X s,dγ decay amplitude with a right-handed photon is believed to be tiny, suppressed by ms,d/mb, 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/(4π), and in exclusive decays by ΔQCD/m b. The suppression is not stronger in B̄0 → Xdγ decays than it is in B̄0 → X sγ. We estimate that the time dependent CP asymmetries in B → K*γ, ργ, Ksπ0γ, and π+π-γ are of order 0.1 and that thev have significant uncertainties.
UR - http://www.scopus.com/inward/record.url?scp=84927719507&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.71.011504
DO - 10.1103/PhysRevD.71.011504
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AN - SCOPUS:84927719507
SN - 1550-7998
VL - 71
SP - 011504-1-011504-5
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 1
M1 - 011504
ER -