举办单位：理论物理研究所

活动主题：QCD Ligh-cone Distribution Amplitudes of Heavy Mesons from boosted HQET

讲座形式：线上学术报告

活动内容：Light-cone distribution amplitudes (LCDAs) frequently arise in factorization theorems involving light and heavy mesons. The QCD LCDA for heavy mesons includes short-distance physics at energy scales of the heavy-quark mass. We achieve the separation of this perturbative scale from the purely hadronic effects by matching the QCD LCDA to the convolution of a perturbative function with the universal, quark- mass independent LCDA defined in heavy-quark effective theory. This factorization allows to resum potentially large logarithms between $\Lambda_{\rm QCD}$ and $m_Q$ as well as between $m_Q$ and the scale Q of the hard process in the production of boosted heavy mesons at colliders. As an application we derive new theoretical predictions for the branching ratio of the decay $W^\pm\to B^\pm\gamma$. Furthermore, we provide phenomenological models for the QCD LCDAs of both the B and D mesons expressed as expansions in Gegenbauer polynomials.

主 讲 人：魏焰冰，北京工业大学讲师。2013年于山东大学获得学士学位，2018年于中科院高能所取得博士学位，此后先后在南开大学与慕尼黑工业大学从事博士后研究，2022年入职北京工业大学。主要从事重味物理唯象学、QCD因子化、有效理论等方面的研究。

听众范围：物理学相关师生

举办时间：2023-09-23

举办地点：腾讯会议

报告类型：理科类