dorsal/arxiv
View SchemaAnalysis of NN Amplitudes up to 2.5 GeV: An Optical Model and Geometric Interpretation
| Authors | H. V. von Geramb, K. A. Amos, H. Labes, M. Sander |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9803031 |
| URL | https://arxiv.org/abs/nucl-th/9803031 |
| DOI | 10.1103/PhysRevC.58.1948 |
| Journal | Phys.Rev.C58:1948-1965,1998 |
Abstract
We analyse the SM97 partial wave amplitudes for nucleon--nucleon (NN) scattering to 2.5 GeV, in which resonance and meson production effects are evident for energies above pion production threshold. Our analyses are based upon boson exchange or quantum inversion potentials with which the sub-threshold data are fit perfectly. Above 300 MeV they are extrapolations, to which complex short ranged Gaussian potentials are added in the spirit of the optical models of nuclear physics and of diffraction models of high energy physics. The data to 2.5 GeV are all well fit. The energy dependences of these Gaussians are very smooth save for precise effects caused by the known $\Delta$ and N$^\star$ resonances. With this approach, we confirm that the geometrical implications of the profile function found from diffraction scattering are pertinent in the regime 300 MeV to 2.5 GeV and that the overwhelming part of meson production comes from the QCD sector of the nucleons when they have a separation of their centres of 1 to 1.2 fm. This analysis shows that the elastic NN scattering data above 300 MeV can be understood with a local potential operator as well as has the data below 300 MeV.
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"abstract": "We analyse the SM97 partial wave amplitudes for nucleon--nucleon (NN)\nscattering to 2.5 GeV, in which resonance and meson production effects are\nevident for energies above pion production threshold. Our analyses are based\nupon boson exchange or quantum inversion potentials with which the\nsub-threshold data are fit perfectly. Above 300 MeV they are extrapolations, to\nwhich complex short ranged Gaussian potentials are added in the spirit of the\noptical models of nuclear physics and of diffraction models of high energy\nphysics. The data to 2.5 GeV are all well fit. The energy dependences of these\nGaussians are very smooth save for precise effects caused by the known $\\Delta$\nand N$^\\star$ resonances. With this approach, we confirm that the geometrical\nimplications of the profile function found from diffraction scattering are\npertinent in the regime 300 MeV to 2.5 GeV and that the overwhelming part of\nmeson production comes from the QCD sector of the nucleons when they have a\nseparation of their centres of 1 to 1.2 fm. This analysis shows that the\nelastic NN scattering data above 300 MeV can be understood with a local\npotential operator as well as has the data below 300 MeV.",
"arxiv_id": "nucl-th/9803031",
"authors": [
"H. V. von Geramb",
"K. A. Amos",
"H. Labes",
"M. Sander"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.58.1948",
"journal_ref": "Phys.Rev.C58:1948-1965,1998",
"title": "Analysis of NN Amplitudes up to 2.5 GeV: An Optical Model and Geometric Interpretation",
"url": "https://arxiv.org/abs/nucl-th/9803031"
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