Chin. Phys. Lett.  2024, Vol. 41 Issue (11): 111201    DOI: 10.1088/0256-307X/41/11/111201
THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
Experimental Road to a Charming Family of Tetraquarks$\ldots$ and Beyond
Feng Zhu, Gerry Bauer, and Kai Yi*
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
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Feng Zhu, Gerry Bauer, and Kai Yi 2024 Chin. Phys. Lett. 41 111201
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Abstract Discovery of the X(3872) meson in 2003 ignited intense interest in exotic (neither $q\bar{q}$ nor $qqq$) hadrons, but a $c\bar{c}$ 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 $J/\psi\,J/\psi$ 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 $J/\psi\,J/\psi$ 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.
Received: 15 September 2024      Review Published: 25 November 2024
PACS:  12.40.Yx (Hadron mass models and calculations)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/41/11/111201       OR      https://cpl.iphy.ac.cn/Y2024/V41/I11/111201
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Feng Zhu
Gerry Bauer
and Kai Yi
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