强子物理在线论坛 Hadron Physics Online Forum (HAPOF)
味物理讲座及第五十三届HAPOF论坛联合报告，Results on fully charmed tetraquarks at the LHC，2022年07月21日
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味物理讲座及第五十三届HAPOF论坛联合报告 报告时间：2022年07月21日 15：00 - 16：30 (Beijing time) Zoom链接：link or Zoom ID: 655 7111 7598, password: 957982 报告链接：味物理讲座 HAPOF论坛 摘要： Quarks and gluons are elementary particles of nature that participate the strong interaction. How quarks are confined to form matter is a fundamental problem of QCD, the theory for the strong interaction in the Standard Model. The last two decades witnessed observations of new types of hadrons consistent with four or five constituent quarks, which provide new insights into QCD. Among them is the observation of X(6900) by LHCb in 2020 in the di-J/psi final state, compatible with a fully charmed tetraquark . A structure close to di-J/psi mass threshold was also reported, however its nature is uncertain in LHCb analysis. Recently, new results on studies of states in di-J/psi mass spectrum are reported by ATLAS and CMS collaborations. The X(6900) state is confirmed by both experiments, with similar mass and width measurements. Besides, a new state X(6600) is observed with 5.7 sigma significance, and another new state X(7300) is reported with 4.1 sigma significance.Fully charmed tetraquarks are likely compact objects, in which four charm quarks interact with by exchanging gluons. Other interpretations include hadron molecules where two charmonia are loosely bound with nuclear-like interaction, and coupled multiple di-quarkonia channel rescattering effect. These states provide an ideal place to study the QCD confinement. In this seminar, results of by ATLAS, CMS and LHCb as well as their impact will be discussed. 报告人简介： ATLAS：许悦，清华大学 许悦，2022年毕业于清华大学物理系，获得博士学位。从事ATLAS实验物理研究，主要集中于寻找超标准模型希格斯玻色子和低质量 共振态。所在团队研究了ATLAS实验中的di-Jpsi数据，确认了X(6900)粒子。 CMS：张敬庆，南京师范大学 张敬庆，2014年毕业于中国科学院大学/中国科学院高能物理研究所，获得博士学位。2015至2020年，先后在高能所和德国波鸿鲁尔 大学做博士后，从事BESIII实验的研究，发现了X(1840)粒子并且确认了X(1750)粒子。2020年开始在南京师范大学做博士后研究， 主要工作为在CMS实验的di-Jpsi数据中寻找和研究新强子。 LHCb: 张艳席，北京大学 张艳席，北京大学助理教授，本科、博士毕业于清华大学，先后在清华大学、法国国家科学研究中心，欧洲核子研究中心从事博士后 研究。从事欧洲核子研究中心LHCb探测器上重味夸克物理研究，研究课题包括味物理、强子物理和重离子物理，参与LHCb实验发现 五夸克态、双粲重子和全粲四夸克态等工作。曾担任LHCb合作者“底强子与重夸克偶素”以及“离子与固定靶”物理分析工作组召集人。
