The interaction of nucleons with antinucleons I. General features of the NN spectrum in potential models

Buck, W.W.; Dover, C.B.; Richard, J.-M.

doi:10.1016/0003-4916(79)90091-5

Cited by 119 publications

(37 citation statements)

References 44 publications

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“…These interactions have in principle two components which can be related to the N self-energy in matter: collisions and annihilation on baryons [264] (imaginary part, semi-classically given by 2 Im V = σvρ) and a piece in the real part (ReV = t NN ρ in the impulse approximation). In the semi-classical limit the real part of the self-energy can be approximated by potential-type interaction [265,266] or a mean field.…”

Section: Antimatter and Strange Mattermentioning

confidence: 99%

Microscopic models for ultrarelativistic heavy ion collisions

Bass

Weber

Hartnack

et al. 1998

Progress in Particle and Nuclear Physics

1,790

784

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Section: Antimatter and Strange Mattermentioning

confidence: 99%

Microscopic models for ultrarelativistic heavy ion collisions

Bass

Weber

Hartnack

et al. 1998

Progress in Particle and Nuclear Physics

1,790

784

View full text Add to dashboard Cite

“…These interactions have two components which can be related to the N self-energy in matter: collisions and annihilation on baryons [1] (imaginary part, semiclassically given by 2ImV = σvρ) and a piece in the real part (ReV = t NN ρ in the impuls approximation). In the semiclassical limit the real part of the self-energy can be approximated by potential-type interaction [2] or a mean field. Here we will focus on the effect of the real part.…”

mentioning

confidence: 99%

Antibaryons in massive heavy ion reactions: Importance of potentials

et al. 1996

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In the framework of RQMD we investigate antiproton observables in massive heavy ion collisions at AGS energies and compare to preliminary results of the E878 collaboration. We focus here on the considerable influence of the real part of an antinucleon-nucleus optical potential on thep momentum spectra.PACS numbers: 14.20 Dh, 25.70.-z Antibaryon production is a promising observable for collective effects in nucleus-nucleus collisions. On the other hand, N 's suffer strong final-state interactions. These interactions have two components which can be related to the N self-energy in matter: collisions and annihilation on baryons[1] (imaginary part, semiclassically given by 2ImV = σvρ) and a piece in the real part (ReV = t NN ρ in the impuls approximation). In the semiclassical limit the real part of the self-energy can be approximated by potential-type interaction[2] or a mean field. Here we will focus on the effect of the real part. The motivation is that the long-range force of baryons acting on ap is expected to be stronger than for protons since the Lorentz-scalar and the Lorentz-vector parts of a meson exchange potential now have the same sign. The influence of baryonic mean-fields on baryons and mesons is well established. Therefore there should also be some influence onp's. The substantial impact of mean-fields on particle spectra was studied earlier [3,4]. Following these ideas, we now investigate observables in nucleus-nucleus collisions, where BB-potentials come into play. For this purpose, we employed a simple modelinteraction, knowing that this choice is far from being unique. In principle, one has to calculate the medium-dependent mean-field and the crosssection selfconsistently to understand N behaviour in matter. We calculate the forces acting on a N in a baryonic medium only after freeze-out. However, by taking the free interaction -annihilation, elastic scattering, non-annihilating inelastic channels -for NN in the collision term during the dynamical evolution the real potential is included effectively. Our approach is similar in its spirit to the usual treatment of the Coulomb distortion of particle spectra which is also restricted to final-state interactions [5]. Addition of free interactions and mean-field contribution would cause 1

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“…In the case of the nucleon-antinucleon interaction, only few polarisation data were collected mainly at LEAR in scattering and protonium experiments [34]. The theoretical description is based on mesonexchange models, which are related to the NN case by G − parity and, added, a phenomenological annihilation potential [35][36][37][38]. The knowledge of the spin-orbit force is decisive for the prediction of polarisation studies with antiprotons and protonium could provide an anchor point measuring the threshold value.…”

Section: Antiprotonsmentioning

confidence: 99%

X-ray spectroscopy of light hadronic atoms

Gotta

2009

Hyperfine Interact

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A series of measurements on light exotic atoms has been performed over the last 15 years at the pion factory of the Paul Scherrer Institut and at CERN's antiproton facility LEAR using the cyclotron trap and a focusing Bragg crystal spectrometer. The experiments with pions reached already an accuracy close to the presently achievable technical limits. The information on antiprotons remains unsatisfactory because the studies were terminated with the shut down of LEAR. Some aspects of high resolution X-ray spectroscopy are discussed as well as relations between the elementary processes of absorption and annihilation to observables in light nuclei.

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The interaction of nucleons with antinucleons I. General features of the NN spectrum in potential models

Cited by 119 publications

References 44 publications

Microscopic models for ultrarelativistic heavy ion collisions

Microscopic models for ultrarelativistic heavy ion collisions

Antibaryons in massive heavy ion reactions: Importance of potentials

X-ray spectroscopy of light hadronic atoms

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