dorsal/arxiv
View SchemaA Consistent Meson-Field-Theoretical Description of PP-Bremsstrahlung
| Authors | J. A. Eden, M. F. Gari |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9506001 |
| URL | https://arxiv.org/abs/nucl-th/9506001 |
| DOI | 10.1103/PhysRevC.53.1102 |
| Journal | Phys.Rev.C53:1102-1131,1996 |
Abstract
A parameter-free and relativistic extension of the RuhrPot meson-baryon model is used to define the dominant isoscalar meson-exchange currents. We compute pp-bremsstrahlung observables below the $\pi-$production threshold using a relativistic hadronic current density that includes impulse, wave function re-orthonormalization, meson-recoil, $\bar{{\rm N}}$N creation and annihilation, $\rho\pi\gamma$ + $\omega\pi\gamma$ + $\rho\eta\gamma$ + $\omega\eta\gamma$ vector-meson decay and N$\Delta\gamma(\pi,\rho)$ exchange currents. We obtain a good description of the available data. The N$\Delta\gamma(\pi)$ current is shown to dominate the large two-body contributions and closed-form expressions for various non-relativistic approximations are analyzed. An experimental sensitivity to the admixture of pseudo-scalar and pseudo-vector admixture of the NN$\pi$ interaction is demonstrated. We examine the Lorentz invariance of the NN$\rightleftharpoons$NN $t$-matrices and show a dominantly pseudo-vector NN$\pi$ coupling renders impulse approximation calculations without boost operators to be essentially exact. Conversely, a similar analysis of the $\Delta{\rm N}\rightleftharpoons$NN transitions shows that boost operators and the two-body $N\Delta\gamma$ wave function re-orthonormalization meson-recoil currents are required in NN, $\Delta$N and $\Delta\Delta$ coupled channel $t$-matrix applications. The need for additional data is stressed.
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"abstract": "A parameter-free and relativistic extension of the RuhrPot meson-baryon model\nis used to define the dominant isoscalar meson-exchange currents. We compute\npp-bremsstrahlung observables below the $\\pi-$production threshold using a\nrelativistic hadronic current density that includes impulse, wave function\nre-orthonormalization, meson-recoil, $\\bar{{\\rm N}}$N creation and\nannihilation, $\\rho\\pi\\gamma$ + $\\omega\\pi\\gamma$ + $\\rho\\eta\\gamma$ +\n$\\omega\\eta\\gamma$ vector-meson decay and N$\\Delta\\gamma(\\pi,\\rho)$ exchange\ncurrents. We obtain a good description of the available data. The\nN$\\Delta\\gamma(\\pi)$ current is shown to dominate the large two-body\ncontributions and closed-form expressions for various non-relativistic\napproximations are analyzed. An experimental sensitivity to the admixture of\npseudo-scalar and pseudo-vector admixture of the NN$\\pi$ interaction is\ndemonstrated. We examine the Lorentz invariance of the NN$\\rightleftharpoons$NN\n$t$-matrices and show a dominantly pseudo-vector NN$\\pi$ coupling renders\nimpulse approximation calculations without boost operators to be essentially\nexact. Conversely, a similar analysis of the $\\Delta{\\rm\nN}\\rightleftharpoons$NN transitions shows that boost operators and the two-body\n$N\\Delta\\gamma$ wave function re-orthonormalization meson-recoil currents are\nrequired in NN, $\\Delta$N and $\\Delta\\Delta$ coupled channel $t$-matrix\napplications. The need for additional data is stressed.",
"arxiv_id": "nucl-th/9506001",
"authors": [
"J. A. Eden",
"M. F. Gari"
],
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"doi": "10.1103/PhysRevC.53.1102",
"journal_ref": "Phys.Rev.C53:1102-1131,1996",
"title": "A Consistent Meson-Field-Theoretical Description of PP-Bremsstrahlung",
"url": "https://arxiv.org/abs/nucl-th/9506001"
},
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