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- W2023177140 abstract "Assuming the dominance of the spin-spin interaction in a diquark, we point out that the mass difference in the beauty sector $M({Z}_{b}^{ensuremath{'}}{)}^{ifmmodepmelsetextpmfi{}}ensuremath{-}M({Z}_{b}{)}^{ifmmodepmelsetextpmfi{}}$ scales with quark masses as expected in QCD, with respect to the corresponding mass difference $M({Z}_{c}^{ensuremath{'}}{)}^{ifmmodepmelsetextpmfi{}}ensuremath{-}M({Z}_{c}{)}^{ifmmodepmelsetextpmfi{}}$. Notably, we show that the decays $mathrm{ensuremath{Upsilon}}(10890)ensuremath{rightarrow}mathrm{ensuremath{Upsilon}}(nS){ensuremath{pi}}^{+}{ensuremath{pi}}^{ensuremath{-}}$ and $mathrm{ensuremath{Upsilon}}(10890)ensuremath{rightarrow}({h}_{b}(1P),{h}_{b}(2P)){ensuremath{pi}}^{+}{ensuremath{pi}}^{ensuremath{-}}$ are compatible with heavy quark spin conservation if the contributions of ${Z}_{b},{Z}_{b}^{ensuremath{'}}$ intermediate states are taken into account, $mathrm{ensuremath{Upsilon}}(10890)$ being either a $mathrm{ensuremath{Upsilon}}(5S)$ or the beauty analog of ${Y}_{c}(4260)$. Belle results on these decays support the quark spin wave function of the $Z$ states as tetraquarks. We also consider the role of light quark spin nonconservaton in ${Z}_{b},{Z}_{b}^{ensuremath{'}}$ decays into $B{B}^{*}$ and ${B}^{*}{B}^{*}$. Indications of possible signatures of the still missing ${X}_{b}$ resonance are proposed." @default.
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- W2023177140 date "2015-01-06" @default.
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- W2023177140 title "Hidden-beauty charged tetraquarks and heavy quark spin conservation" @default.
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- W2023177140 doi "https://doi.org/10.1103/physrevd.91.017502" @default.
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