Experimental Road to a Charming Family of Tetraquarks...and Beyond  

作　　者：Feng Zhu Gerry Bauer Kai Yi 朱峰;Gerry Bauer;易凯(Ministry of Education Key Laboratory of NSLSCS,Institute of Physics Frontiers and Interdisciplinary Sciences,School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]Ministry of Education Key Laboratory of NSLSCS,Institute of Physics Frontiers and Interdisciplinary Sciences,School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China

出　　处：《Chinese Physics Letters》2024年第11期17-33,共17页中国物理快报（英文版）

基　　金：supported by the Research Start-Up Funding Project of Nanjing Normal University;the National Natural Science Foundation of China(Grant Nos.12075123 and 12061141002);the National Science Research and Development Program of China(Grant No.2023YFA1605804)。

摘　　要：Discovery of the X(3872)meson in 2003 ignited intense interest in exotic(neither qq nor qqq)hadrons,but a cc interpretation of this state was difficult to exclude.An unequivocal exotic was discovered in the Z_(c)(3900)^(+)meson—a charged charmonium-like state.A variety of models of exotic structure have been advanced but consensus is elusive.The grand lesson from heavy quarkonia was that heavy quarks bring clarity.Thus,the recently reported triplet of all-charm tetraquark candidates—X(6600),X(6900),and X(7100)—decaying to J/ψJ/ψ is a great boon,promising important insights.We review some history of exotics,chronicle the road to prospective all-charm tetraquarks,discuss in some detail the divergent modeling of J/ψJ/ψ structures,and offer some inferences about them.These states form a Regge trajectory and appear to be a family of radial excitations.A reported,but unexplained,threshold excess could hint at a fourth family member.We close with a brief look at a step beyond:all-bottom tetraquarks.

关 键 词：QUARK MESON 

分 类 号：O572.33[理学—粒子物理与原子核物理]