讲座主题：Heavy-flavor-conserving weak decays of heavy baryons

专家姓名：郑海扬

工作单位：中国台湾中研院物理所

讲座时间：2024年04月17日14:30-16:00

讲座地点：科技馆1511会议室

主办单位：hy590海洋之神平台物理与电子信息学院

内容摘要：

Three decades ago, heavy-flavor-conserving (HFC) weak decays of heavy baryons such as ΞQ→ΛQ+π and ΩQ→ΞQ+π for Q = c, b had been proposed and studied within the framework that incorporates both heavy-quark and chiral symmetries. HFC decays have two great advantages: (1) S-wave can be evaluated reliably using current algebra, and (2) if the heavy quark in the HFC process behaves as a spectator, then the P-wave amplitude of ΞQ→ΛQ+π will vanish. In the b sector, HFC decay was first measured by LHCb in 2014 and it was well understood. However, HFC decay in the charm sector, namely, ΞQ→ΛQ+π was not measured until 2020. The theoretical prediction of its branching fraction is too small compared to experiment. The puzzle was finally resolved recently. It took thirty years to fully understand the underlying mechanism forcharm-flavor-conserving weak decays of charmed baryons.

主讲人介绍：

郑海扬，中国台湾中研院物理研究所特聘研究员。1980年获得美国普渡大学物理学博士学位，1980至1985期间，在普渡大学和布兰迪斯大学从事博士后研究，1988年任中国台湾中研院全职研究员，2012年起任特聘研究员。先后在普渡大学、印第安纳大学、纽约州立大学石溪分校、布鲁克海汶国家实验室任访问教授。郑海扬研究员多年来一直致力于重味物理、强子物理领域的学术研究，做了许多先驱性的工作，在国际上享有盛誉。迄今为止，在Phys.Rev.Lett.、Phys.Rev.D等主流期刊发表论文240余篇，引用16000余次，单篇引用超100次以上文章30余篇，h因子68。