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Heavy quark spin symmetry breaking in near-threshold J^(PC)=1⁻⁻ quarkonium-like resonances
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Heavy quark spin symmetry breaking in near-threshold J^(PC)=1⁻⁻ quarkonium-like resonances
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A mixing of near-threshold quarkonium-like resonances with heavy meson-antimeson pairs results in an enhancement of heavy quark spin symmetry breaking, since the meson pairs are not eigenstates of the heavy quark spin. The decomposition of $P$-wave states of meson pairs in terms of the heavy-quark-pair spin states is considered in the channel with $J^{PC}=1^{--}$, which is directly produced in $e^+e^-$ annihilation. Specific processes are suggested for experimental study of the effects of the mixing with heavy meson pairs and of the internal spin structure of bottomonium and charmonium resonances.
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