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How charm pollutes beauty

创建于2019年09月29日 星期日作者 : 科研办 浏览量 :

主讲人:秦溱,华中科技大学副教授
时  间:2019年10月11日 20:00
地  点:物电澳门新普京下载A栋217
联系人:程山

 

讲座摘要: Rare inclusive $B$ decays such as $\bar{B}\to X_{s(d)} \ell^+\ell^-$ are interesting probes for physics beyond the Standard Model. Due to the complementarity to their exclusive counterparts, they might shed light on the anomalies currently seen in exclusive $b \to s$ transitions. By making use of operator product expansion, the rate of the decay can be calculated by systematic expansion of strong coupling and $1/m_b$. However, various long distance effects, especially those induced by charm loops, would pollute the calculation and reduce the precision. In the present work we revisit and improve the description of these effects in inclusive decays such as charmonium and light-quark resonances, nonfactorisable power corrections, and cascade decays. We then apply these results to a state-of-the-art phenomenological study of $\bar{B}\to X_d \ell^+\ell^-$. To fully exploit the new-physics potential of inclusive flavour-changing neutral current decays, the $\bar{B}\to X_d \ell^+\ell^-$ observables should be measured in a dedicated Belle II analysis.

 

主讲人简介:秦溱,华中科技大学物理澳门新普京下载副教授。2011年于南京大学物理澳门新普京下载获物理学专业学士学位,2016年于中科院高能所获理论物理专业博士学位。其后在德国锡根大学从事博士后研究工作,2019年入职华中科技大学物理澳门新普京下载。长期研究粒子物理唯象学,目前主要领域为重夸克物理,专注相关物理过程的精确计算,将标准模型理论预言与实验对比,从而寻找新物理信号。同时也关心对撞机物理和新物理模型唯象学。

 

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