An overview of XYZ new particles

Xiang Liu

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classification ✦ hep-ph hep-exnucl-exnucl-th

keywords statesbeenbottomoniumlikebrieflycharmoniumlikedecadediscussionsexperimental

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In the past decade, more and more charmoniumlike and bottomoniumlike states have been reported in experiments, which have led us to extensive discussions on the underlying structure of these states. In this review paper, we briefly summarize the experimental and theoretical status of these observed states.

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Hunting for $B\bar B$ molecular state $X_{b0}$ via radiative transition of $\Upsilon(10753)$
hep-ph 2026-05 unverdicted novelty 4.0

The decay Υ(10753) → γ X_b0 is predicted to have partial width 0.2-1.5 keV and branching fraction 10^{-6} to 10^{-5} for binding energies 0-10 MeV, dominated by B1(') meson loops.