2023-09-18 信息来源：线上
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