Role of Meson-meson Correlation Effects in the Nn → Ρπ Annihilation Process

Meson-meson correlation effects are investigated in the NN → ρπ annihilation process using a realistic meson-exchange model for the ρπ interaction determined previously, together with a conventional baryon-exchange transition model and a consistent NN interaction. For NN S-states, they have a drastic effect and bring the relative (S0/ S1) branching ratio up to the experimental value, thus resolving the long-standing so-called “ρπ” puzzle. For NN P -states, their effect is of minor importance, and discrepancies remain for those ratios involving annihilation from the NN(PJ) state to ρπ(l ′ = 2). Typeset using REVTEX