Light Quark Spin Symmetry in $Z_b$ Resonances?

Abstract

It is argued that the recent Belle data, consistent with no activity in the spectrum of the $B^{\ast }\bar{B}+B{\bar{B}}^{\ast }$ pairs at the mass of the $Z_b(10650)$ resonance, imply that the part of the interaction between heavy mesons that depends on the total spin of the light quark and antiquark is strongly suppressed. In particular this part appears to be significantly weaker than can be inferred from pion exchange. If confirmed by future more detailed data, the symmetry with respect to the light quark spins, in combination with the heavy quark spin symmetry, would imply existence of four additional $I^G=1^{-}$ resonances at the thresholds for heavy meson-antimeson pairs.

8 pages, 1 figure

References in corpus (3)

• The Heavy Quark Spin Symmetry Partners of the X(3872)
• Hidden-Beauty Charged Tetraquarks and Heavy Quark Spin Conservation
• Exotic resonances due to $\eta$ exchange

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• Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners
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• The line shapes of the $Z_b(10610)$ and $Z_b(10650)$ in the elastic and inelastic channels revisited
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• The $X_0(2900)$ and its heavy quark spin partners in molecular picture
• Strange hadrocharmonium
• Is $Z_{cs}(3982)$ a molecular partner of $Z_c(3900)$ and $Z_c(4020)$ states?
• Radiative and $\rho$ transitions between heavy quarkonium and isovector four-quark states
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• Entanglement suppression and low-energy scattering of heavy mesons
• A mixing model for bottomoniumlike $Z_b$ resonances
• Hadronic resonances enhanced by thresholds
• Two charmoniumlike charged axial resonances near 3885 MeV
• Quark spin structures of bottom-charmed threshold molecular states
• Lectures on Bound states
• Exotic hadrons associated with $b$-quark