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On the nature of X(6900) and other possible states in the LHCb di-J/psi spectrum
by
Prof.De liang Yao
(Hunan University)
→
Asia/Shanghai
B105 (CHEP)
B105
CHEP
School of Physics, PKU
Description
Partial wave analysis is performed, with effective potentials as dynamical inputs, to scrutinize the recent LHCb data on the di-J/psi invariant mass spectrum. Coupled-channel effects are implemented in the production amplitude via final state interactions. The LHCb data can be well described. A dynamical generated pole structure, which can be identified as the X(6900) state, is found. Our analysis also provides hints for the existence of three other possible states: a bound state X(6200), a broad resonant state X(6670) and a narrow resonant state X(7200). Furthermore, the J^{PC} quantum numbers of the X(6670) and X(6900) states should be 2^{++}, while the X(6200) and X(7200) states prefer 0^{++}.
报告人简介:姚德良,2013年博士毕业于北京大学。2013年至2016年,在德国Juelich研究中心从事博士后研究;2016年至2018年,西班牙国家研究委员会IFIC研究所从事博士后研究;2018年至2019年,任中国科学院近代物理研究所研究员;2019年至今,任湖南大学教授。研究方向主要是利用有效场论(手征微扰理论)与色散关系研究强子物理和核物理。近年来,致力于高精度计算介子核子散射等一些基本过程,发展不稳定粒子的手征动力学,将手征微扰理论推广到中高能区域,利用分波技术研究奇特强子态等。
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