【摘 要】
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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 factori
【机 构】
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College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China;Sch
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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 →γ?v decay at leading power in Λ/mb.Furthermore,we investigate the power suppressed local contributions,factorizable non-local contributions (which are suppressed by 1/Eγ and 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 de-crease the form factors.Finally,the integrated branching ratios are also calculated for comparison with future experi-mental data.
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