Role of MesonMeson Correlation Effects in the NNbtorhopi Annihilation Process.pdf

KFA-IKP(TH)-1994-42 ROLE OF MESON-MESON CORRELATION EFFECTS IN THE NN → ρπ ANNIHILATION PROCESS V. Mull, G. Janssen and J. Speth 4 Institut f¨ur Kernphysik, Forschungszentrum J¨ulich GmbH, D-52425 J¨ulich, Germany 9 9 1 K. Holinde c e D Departamento de Fisica Teorica, Facultad de Ciencias Fisicas, Universidad de Valencia, Burjasot 6 (Valencia), Spain 1 v and 7 0 Institut f¨ur Kernphysik, Forschungszentrum J¨ulich GmbH, D-52425 J¨ulich, Germany 0 2 1 (February 9, 2008) 4 9 / h t - l Abstract c u n : Meson-meson correlation effects are investigated in the NN → ρπ annihi- v i X lation process using a realistic meson-exchange model for the ρπ interaction r a determined previously, together with a conventional baryon-exchange transi- tion model and a consistent NN interaction. For NN S-states, they have a 1 3 drastic effect and bring the relative ( S / S ) branching ratio up to the ex- 0 1 perimental value, thus resolving the long-standing so-called “ρπ” puzzle. For NN P -states, their effect is of minor importance, and discrepancies remain 3 ′ for those ratios involving annihilation from the NN ( PJ ) state to ρπ