论文标题
独家B衰变的结构依赖性QED效果
Structure-Dependent QED Effects in Exclusive B Decays at Subleading Power
论文作者
论文摘要
我们得出了弱独家过程中与结构相关的QED效应的分解定理$ b^ - \ to \ ell^ - \barν_\ ell $，即效果探测$ b $ meson的内部结构。该推导需要仔细处理端点变散的卷积，共有旋转功率分解公式。我们发现，衰减振幅对$ b $梅森的两粒子轻锥分布幅度以及对新的Hadronic参数$ f（μ，λ）$敏感，这概括了$ b $ -Meson衰减在QED效应的情况下的概念。这是转向驱动分解定理的第一个推导，其中软函数是非扰动的耐药矩阵元素。
We derive a factorization theorem for the structure-dependent QED effects in the weak exclusive process $B^-\to\ell^-\barν_\ell$, i.e., effects probing the internal structure of the $B$ meson. The derivation requires a careful treatment of endpoint-divergent convolutions common to subleading-power factorization formulas. We find that the decay amplitude is sensitive to two- and three-particle light-cone distribution amplitudes of the $B$ meson as well as to a new hadronic parameter $F(μ,Λ)$, which generalizes the notion of the $B$-meson decay constant in the presence of QED effects. This is the first derivation of a subleading-power factorization theorem in which the soft functions are non-perturbative hadronic matrix elements.
