Hadronic transitions in quarkonium
2020
We report on a new approach to compute quarkonium hadronic transitions which does not rely on the standard twist expansion of the intermediate octet propagator. The latter cannot be justified for the energy release of hadronic transitions between heavy quarkonium states with different principal quantum numbers. Instead, we use that the octet state spectrum corresponds to the hybrid quarkonium one which can be obtained from nonrelativistic effective field theories (EFT) of QCD and lattice computations of the heavy-quark-antiquark static energies.
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