Exclusive meson production in hadron-nucleus collisions

Krippa, Boris; Cassing, W.; Mosel, U.

doi:10.1016/0375-9474(95)00313-p

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…Similar problems in reproducing the angular distributions for the p d → 3 He ω reaction also have been reported in Refs [118,119]. A comparison of the one and two step processes in the 12 C(p, η) 13 N reaction can be found in [120].…”

Section: One Two and Three Body Mechanismssupporting

confidence: 72%

Interaction of eta mesons with nuclei

et al. 2013

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Back in the mid-1980s, a new branch of investigation related to the interaction of eta mesons with nuclei came into existence. It started with the theoretical prediction of possible exotic states of eta mesons and nuclei bound by the strong interaction and later developed into an extensive experimental program to search for such unstable states as well as understand the underlying interaction via eta-meson producing reactions. The vast literature of experimental as well as theoretical works that studied various aspects of eta-producing reactions such as the π(+)n → ηp, pd → (3)Heη, p (6)Li → (7)Be η and γ (3)He → η X, to name a few, had but one objective in mind: to understand the eta-nucleon (ηN) and hence the η-nucleus interaction which could explain the production data and confirm the existence of some η-mesic nuclei. In spite of these efforts, there remain uncertainties in the knowledge of the ηN and hence the η-nucleus interaction. Therefore, this review is an attempt to bind together the findings in these works and draw some global and specific conclusions which can be useful for future explorations.The ηN scattering length (which represents the strength of the η-nucleon interaction) using different theoretical models and analyzing the data on η production in pion, photon and proton induced reactions was found to be spread out in a wide range, namely, 0.18 ≤ Re aηN ≤ 1.03 fm and 0.16 ≤ Rm aηN ≤ 0.49 fm. Theoretical searches of heavy η-mesic nuclei based on η-nucleus optical potentials and lighter ones based on Faddeev type few-body approaches predict the existence of several quasibound and resonant states. Although some hints of η-mesic states such as (3)(η)He and (25)(η)Mg do exist from previous experiments, the promise of clearer signals for the existence of η-mesic nuclei lies in the experiments to be performed at the J-PARC, MAMI and COSY facilities in the near future. This review is aimed at giving an overall status of these efforts.

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Section: One Two and Three Body Mechanismssupporting

confidence: 72%

Interaction of eta mesons with nuclei

et al. 2013

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Pion production in proton-proton collisions in a covariant one-boson-exchange model

et al. 1996

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Motivated by the renewed interest in studying the pion production on nuclei with protons at few GeV incident energies, we investigate the pion production in proton-proton collisions over an energy range of 300 M eV to 2 GeV . Starting from a realistic one-boson exchange model with parameters fitted to the amplitudes of the elastic nucleon-nucleon scattering, we perform fully covariant calculations for the total, double and triple differential cross-sections of the p(p, nπ + )p and p(p, pπ 0 )p reactions. The calculations incorporate the exchange of π, ρ, ω and σ mesons and treat nucleon and delta isobar as intermediate states. We obtain a reasonably good agreement with the experimental data in the entire range of beam energies. The form of the covariant delta propagator, the cut-off parameter for the πN N and πN ∆ vertex form factors and the energy dependence of the delta isobar decay width is investigated. * Work supported by GSI, Darmstadt, KFA Jülich and JSPS.

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Exclusive meson production in hadron-nucleus collisions

Cited by 2 publications

References 34 publications

Interaction of eta mesons with nuclei

Interaction of eta mesons with nuclei

Pion production in proton-proton collisions in a covariant one-boson-exchange model

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