Chang-Zheng Yuan
Published 2022-11-14Version 1
The discovery of hadronic states beyond the conventional two-quark meson and three-quark baryon picture in the last two decades is one of the most amazing accomplishments in fundamental physics research. Many experiments contributed to this field despite of the original goals of the design. We review the experimental progress on the study of the quarkoniumlike states -- states with at least one heavy quark-antiquark pair and possible light quarks, also known as XYZ states. We give a general review and then focus on the new experimental results on the X(3872) and its bottom-quark partner X_b, the X(3960), the Y(4260), Y(4500), Y(4660), and Y(10750), and the charged charmoniumlike Z_c and Z_{cs} states. The observations suggest that we did observe hadronic molecules and we also observed hadronic states with some other quark configurations. Possible further studies at the existing and future facilities are briefly discussed.
Comments: brief review based on invited talk at the XVth Quark Confinement and the Hadron Spectrum conference. arXiv admin note: substantial text overlap with arXiv:2111.07514
Investigating $Z_{cs}(3985)$ and $Z_{cs}(4000)$ exotic states in $Λ_b\to Z^-_{cs}p$ decays
New insight into the exotic states strongly coupled with the $D\bar{D}^*$ from the $T^+_{cc}$
A combined analysis of the $Z_c(3900)$ and the $Z_{cs}(3985)$ exotic states
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