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V. Baru

As seen in: Physical Review B
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Emergence of heavy quark spin symmetry breaking in heavy quarkonium decays

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By V. Baru, E. Epelbaum, C. Hanhart
| Physical Review B
Abstract Heavy-quark spin symmetry (HQSS) implies that in the direct decay of a heavy quarkonium with spin S, only lower lying heavy quarkonia with the same spin S can be produced. However, this selection rule, expected to work very well in the b-quark sector, can be overcome if multiquark intermediate states are involved in the decay chain, allowing for transitions to the final-state heavy quarkonia with a different spin S′.
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