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 FA,V in the B→γℓνdecay at leading power inΛ/mb.Furthermore,we investigate the power suppressed local contributions,factorizable non-local contributions(which are suppressed by 1/Eγand 1/mb),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.
作者
Yue-Long Shen
Yan-Bing Wei
Xue-Chen Zhao
Si-Hong Zhou
沈月龙;魏焰冰;赵雪辰;周四红(College of Information Science and Engineering,Ocean University of China,Qingdao 266100,China;School of Physics,Nankai University,Weijin Road 94,Tianjin 300071,China;School of Physical Science and Technology,Inner Mongolia University,Hohhot 010021,China)
基金
Y.B.W is Supported in part by the National Natural Science Foundation of China(NSFC)(11675082,11735010)。
