Revisiting radiative leptonic B decay

被引：9
|
作者：
Shen, Yue-Long [1 ]
Wei, Yan-Bing [2 ]
Zhao, Xue-Chen [2 ,3 ]
Zhou, Si-Hong
机构：
[1] Ocean Univ China, Coll Informat Sci & Engn, Qingdao 266100, Peoples R China
[2] Nankai Univ, Sch Phys, Weijin Rd 94, Tianjin 300071, Peoples R China
[3] Inner Mongolia Univ, Sch Phys Sci & Technol, Hohhot 010021, Peoples R China
来源：
CHINESE PHYSICS C | 2020年 / 44卷 / 12期
基金：
中国国家自然科学基金;
关键词：
B physics; RG equation; QCD factorization; form factors; FACTORIZATION; MESON;
D O I：
10.1088/1674-1137/abb6df
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
In this paper, we summarize the existing methods of solving the evolution equation of the leading-twist B-meson LCDA. Then, in the Mellin space, we derive a factorization formula with next-to-leading-logarithmic (NLL) resummation for the form factors F-A,F-i n the B -> gamma lv decay at leading power in Lambda/m(b). Furthermore, we investigate the power suppressed local contributions, factorizable non-local contributions (which are suppressed 1/E-gamma and 1/m(b)), and soft contributions to the form factors. In the numerical analysis, which employs the two-loop-level hard function and the jet function, we find that both the resummation effect and the power corrections can sizably decrease the form factors. Finally, the integrated branching ratios are also calculated for comparison with future experimental data.
引用
收藏
页数：9
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