On the treatment of NN interaction effects in meson production in NN collisions
نویسندگان
چکیده
We clarify under what circumstances the nucleon–nucleon final state interaction fixes the energy dependence of the total cross–section for the reaction NN → NNx close to production threshold, where x can be any meson whose interaction with the nucleon is not too strong. We strongly criticize the procedure used recently by several authors to include the final state interaction in the reactions under discussion. In addition, we give a formula that allows one to estimate the effect of the initial state interaction for the production of heavy mesons.
منابع مشابه
- th / 9 60 70 16 v 1 1 1 Ju l 1 99 6 Threshold meson production in nucleon - nucleon collisions 1
A brief overview on recent model calculations for near threshold pion production in nucleon-nucleon collisions is given. Results from our own investigations of the reactions pp → ppπ 0 and pn → dπ 0 are presented. Direct production, heavy meson exchange and pion rescattering are taken into account. For the latter a T-matrix obtained from a microscopic model of the πN interaction is employed. We...
متن کاملPseudoscalar and Vector Meson Production in Nn Collisions *
Heavy meson production in nucleon-nucleon collisions is discussed within a meson exchange model of hadronic interactions, paying special attention to the basic dynamics that determine the behavior of the cross sections near the threshold energy. The pp → ppφ reaction is discussed as an example of the production of vector mesons in N N collisions. For the pseudoscalar me-son production, results ...
متن کاملDescription of intermediate- and short-range NN nuclear force within a covariant effective field theory
The present paper is aimed to developing an effective field theory in the GeV region to describe consistently both elastic and inelastic NN -scattering in a fully covariant way. In this development we employ our novel s-channel mechanism of NN -interaction at intermediate and short ranges assuming a formation of the sixquark bag dressed with basic meson fields such as π, σ, ρ and ω in the inter...
متن کاملOn the Migdal-Watson approach to FSI effects in meson production in NN collisions
The influence of the nucleon-nucleon final state interaction (FSI) on properties of the meson production amplitude near threshold is discussed. For the nucleon-nucleon interaction a simple Yamaguchi potential as well as realistic potential models are considered. It is shown that FSI effects cannot be factorized from the production amplitude. The absolute magnitude of FSI effects depends on the ...
متن کاملRole 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 resol...
متن کامل