J/ψ-pair resonances by LHCb: a new revolution?

作     者：Luciano Maiani Luciano Maiani

作者机构：Dipartimento di Fisica and INFNSapienza Universitàdi RomaPiazzale Aldo Moro 2.1-00185 RomaItaly T.D.Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2020年第65卷第23期

页      面：1949-1951页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：I would like to thank Antonello Polosa and Elena Santopinto for many discussions and suggestions on exotic hadrons and for support in writing this comment. A conversation with Sheldon Stone was very useful in the preparation of the work quoted in Ref. 

主　　题：spectrum narrow quark 

摘      要：In a research article appeared in this journal[1], the LHCb Collaboration has presented an extraordinary result on the mass spectrum of J/ψ-pairs produced in proton-proton high energy collisions. The spectrum shows: a narrow structure around 6:9 GeV matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass. In the same region, more resonances may be present, not clearly distinguished within present statistics(see Fig. 1). A new spectroscopy is waiting for us, that of fully charm tetraquarks, which parallels the spectroscopy of charmonia revealed by the J/ψ discovery of 1974.