Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-04-21
Phys.Lett.B309:163-173,1993
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX (style article) 19 pages, UGVA-DPT 12-801
Scientific paper
10.1016/0370-2693(93)91521-N
Although no asymptotic heavy quark spin symmetry, and even more no flavor symmetry, are expected for systems such as quarkonium, a numerical discussion shows that for some processes and in a preasymptotic region which may roughly include charmonium and bottomonium, the use of the spin-symmetry may be useful in conjunction with chiral symmetry for light hadrons (soft-exchange- approximation regime, SEA). We continue our discussion of hadronic transitions in the SEA-regime by studying in particular chiral breaking transitions such as $~^3P' \to ~^3P\pi^0$, $~^3P\eta$, level splittings and transitions which break both chiral and spin symmetry, such as $\psi ' \to J/\psi \pi^0$, $J/\psi \eta$, and $~^1P_1 \to J/\psi \pi^0$.
Bartolomeo Nicola Di
Casalbuoni Roberto
Deandrea Aldo
Feruglio Ferruccio
Gatto Raoul
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