应兰州大学核科学与技术学院、稀有同位素前沿科学中心邀请，北京工业大学讲师魏焰冰老师将于2024年9月11日来校进行学术交流并作报告。

 

       报告题目：黑洞与它的内部结构QCD Light-Cone Distribution Amplitudes of Heavy Mesons from boosted HQET

       报告时间：2024年9月11日（星期三）16：00-18：00   

       报告地点：兰州大学二分部现物楼214室

       腾讯会议：759-201-582

 

       欢迎广大师生参加！

 

【报告摘要】

       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.

【报告人简介】

       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。此后在南开大学从事博士后研究，2020年作为洪堡学者在慕尼黑工业大学做物理研究。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。

                                                                                                                                                                   

核科学与技术学院

稀有同位素前沿科学中心

2024年9月9日