Lattice QCD calculations indicate degeneracy of 1-- and 0-+ adjoint mesons, supporting a BOEFT explanation for the observed decay suppression in Z_b' relative to Z_b.
Exotic hadrons associated with๐-quark
4 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Compared to charmonium-like states, exotic hadrons associated with $b$-quark offer distinct advantages for exploring the nature of multiquark phenomena and the dynamics of the strong interaction. Due to the heavier bottom quark mass, theoretical calculations, particularly those based on effective field theories and potential models, tend to be more reliable and under better control in the bottomonium sector. With its clean $e^+e^-$ collision environment and high luminosity, the Belle and Belle II experiments are ideally suited to explore these exotic hadrons associated with $b$-quark, including $Z_b$, $X_b$, and $Y_b$ states, and charmonium-like states in $B$ decays. Utilizing the large proton--proton collision dataset, the LHCb experiment has conducted extensive investigations of heavy-flavor multiquark states through $B$ and $\Lambda_b$ decay channels. The relevant phenomenological interpretations are also reviewed.
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QCD sum rules yield lowest masses of 1.53-2.34 GeV for light 1^{--} tetraquarks across isoscalar, isovector and isotensor sectors plus one 1^{-+} isotensor mass of 2.19 GeV.
A coupled-channel framework is developed and fitted to BESIII data on vector charmonium-like states in the 4.1-4.6 GeV range, concluding that coupled-channel effects with dynamically generated poles explain the line shapes.
Joint analysis of experimental and lattice data confirms Z_c(3900) and Z_cs(3985) as SU(3) flavor partners with pole masses (3879.6 ยฑ 4.8) MeV and (3976.9 ยฑ 5.1) MeV, half-widths (32.2 ยฑ 4.7) MeV and (28.8 ยฑ 5.9) MeV, both resonances.
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Vector charmonium(-like) states in the energy range of 4.1-4.6 GeV
A coupled-channel framework is developed and fitted to BESIII data on vector charmonium-like states in the 4.1-4.6 GeV range, concluding that coupled-channel effects with dynamically generated poles explain the line shapes.
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Determination of the $Z_c(3900)$ and the $Z_{cs}(3985)$ states from joint analysis of experimental and lattice data
Joint analysis of experimental and lattice data confirms Z_c(3900) and Z_cs(3985) as SU(3) flavor partners with pole masses (3879.6 ยฑ 4.8) MeV and (3976.9 ยฑ 5.1) MeV, half-widths (32.2 ยฑ 4.7) MeV and (28.8 ยฑ 5.9) MeV, both resonances.