Meson Production in Antinucleon Annihilation on Nuclei

Stefanie Lourenço ,S Wycech,H Lenske

doi:10.1051/epjconf/20123706009

Stefanie Lourenço , S Wycech + Show 1 more

Open Access

https://doi.org/10.1051/epjconf/20123706009

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Abstract

Pion production in coherent antiproton annihilation reactions on nuclei is studied in a fully quantum mechanical description. The elementary elastic NN and the NN! n annihilation vertices are obtained from a t-matrix accounting for coupled chan- nels e ects. The theoretical amplitudes are used to derive a microscopic NA optical model potential and the meson production vertices. Pion nucleus final state interaction are taken into account by adding higher pion-nucleon resonances beyond the -resonance. Nuclear structure aspects are described by HFB-theory. Results for pA, A and meson production cross sections are presented.

Highlights

The interactions of antinucleons with nucleons and nuclei are dominated by annihilation processes giving access to a large variety of particle production channels, from pions over heavier mesons to baryon-antibaryon production
The results are of interest for a large variety of investigations with antiprotons planned for the upcoming FAIR@GSI facility
A common feature of both production mechanisms is the difference of scales: Nuclear dynamics is governed by momenta of the order of the Fermi momentum, kF ∼ 250 MeV/c

Summary

Introduction

The interactions of antinucleons with nucleons and nuclei are dominated by annihilation processes giving access to a large variety of particle production channels, from pions over heavier mesons to baryon-antibaryon production. The underlying annihilation processes are still not completely understood and ask for a consistent theoretical study. In our work [1], we aim for a fully quantum mechanical description of the interaction of antinucleons with nucleons and nuclei. At present we are focusing on investigations of two-meson production on nuclei. The results are of interest for a large variety of investigations with antiprotons planned for the upcoming FAIR@GSI facility

Initial State Interaction

Final State Interaction

Meson Production by Antinucleon Annihilation on Nuclei

Summary