Abstract
The annihilation of atomic S- and P-states of the proton-antiproton system into two nonstrange mesons is investigated. The annihilation mechanism is described by the non-relativistic A2 quark annihilation model including the 3P0 quark-antiquark dynamics. Initial state interaction, containing isospin and tensor force mixing as based on different potential models for the N Nbar system, is included. Branching ratios for the two-meson annihilation channels display a strong sensitivity on the initial state interaction. The dependence of branching ratios on the size parameters of the hadrons, as reflected in the effective hadronic form factors arising in the quark model, is explored. Special focus is given to annihilation channels involving dynamical selection rules: that is, suppression of transitions which are allowed by the conservation of the JPC(IG) quantum numbers. Results are compared with a previous, simplified approach for two-meson annihilation.
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