Radiative Leptonic Decay B->gamma-ell-nu in QCD

本项目的目标是利用QCD因子化和色散技术对辐射轻子衰变B -> gamma ell nu进行最新的研究，这是这类过程中最简单的过程，它的研究对于约束B介子光锥分布振幅（DA）是必要的。相应的测量将来自去年开始收集数据的贝儿~II实验。我们在第二个供资期的任务是双重的。在理论方面，我们将推导出B介子DA的次领先阶演化方程。在分析方面，我们将从到达的数据中提供对B介子DA在双参数空间中的约束。

The goal of this project is a state-of-the-art study of the radiative leptonic decay B -> gamma ell nu using a combination of QCD factorization and dispersion techniques.This is the simplest process of this kind, and its study is necessary to constrain the B-meson light-cone distribution amplitude (DA). The corresponding measurement will come from the Belle~II experiment which started gathering data last year. Our tasks for the second funding period are twofold. On the theory side, we willderive the next-to-leading order evolution equation for the B-meson DA.On the analysis side, we will provide constraints on the B-meson DA in the two-parameter space from the arriving data.