Dynamical selection rules from ... annihilation at restin three meson final states.

The hadronic annihilation branching-ratios in quasi-two-body final states have been obtained from the observation of the reactions &pmacr;p→π⁺π^-π^o K⁺K^-K^±π±K^o at rest in hydrogen targets at different densities. The enhancement or suppression of specific hadronic channels connected to dyna-mical selection rules is observed in the production of different resonances both in protonium S and P-waves, systematically investigated for the first time. Besides the well known ?(770)π and a₂(1320)p enhancement from ³S₁ and ¹S_o partial waves, the dominance of one isospin source in K^*(892)&Kmacr; production, well established from S-waves, is confirmed also in P-waves (¹S⁰, I = 0; ³S₁, I = 1; ¹P₁, I = 0; 3P1, I = 0; ³P₂, I = 1). In addition, the experimental data clearly show a strong suppression of ø(1020)π and a₀(980)π final states from P-wave which has a remarkable coincidence with K^*(892)&Kmacr;pattern production. [ABSTRACT FROM AUTHOR]