摘要：
As the lightest and simplest hadron composited by  valence quarks, pion meson and the involved channels are usually treated as the benchmarks of measurements, which requires the  theoretical calculations based on the knowledge of its inner structure to achieve at a high accuracy. How precise do we know the pion meson light-cone distribution amplitudes (LCDAs) ?  In this talk I will firstly review the current status of pion LCDAs, particularly for the Gegenbauer expansion coefficients a_n^π. Secondly, I will report our recent study of the first few coefficients and the chiral mass by the data-driven dispersion relation with the electromagnetic form factor. Followed I will furtherly go to the LCDAs of dipion system where the double expansion coefficients B_nl^I would be discussed. I would like to conclude the talk with the phenomena in heavy flavor decays.

报告人简介：
程山，湖南大学副教授，岳麓学者。2015年在南京师范大学获得理学博士学位，随后在德国锡根大学从事博士后研究，2018年入职湖南大学，历任助理教授、副教授。致力于在味物理领域中开展标准模型精确检验的研究，目前的研究兴趣集中在CP破坏、重夸克弱衰变唯象学和轻强子（系统）内部结构的描述。