Photon polarization in B→Xγ in the standard model -: art. no. 011504

被引：83
|
作者：
Grinstein, B [1 ]
Grossman, Y
Ligeti, Z
Pirjol, D
机构：
[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
[2] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel
[3] Boston Univ, Dept Phys, Boston, MA 02215 USA
[4] Harvard Univ, Jefferson Lab Phys, Cambridge, MA 02138 USA
[5] Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[6] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA
来源：
PHYSICAL REVIEW D | 2005年 / 71卷 / 01期
关键词：
D O I：
10.1103/PhysRevD.71.011504
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The standard model prediction for the (B) over bar (0)-->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)/(4pi), and in exclusive decays by Lambda(QCD)/m(b). The suppression is not stronger in (B) over bar (0)-->X(d)gamma decays than it is in (B) over bar (0)-->X(s)gamma. We estimate that the time dependent CP asymmetries in B-->K(*)gamma, rhogamma, K(S)pi(0)gamma, and pi(+)pi(-)gamma are of order 0.1 and that they have significant uncertainties.
引用
收藏
页码：011504 / 1
页数：5
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