dorsal/arxiv
View Schema$e^+e^-$ pairs from $\pi^-$A reactions
| Authors | Th. Weidmann, E. L. Bratkovskaya, W. Cassing, U. Mosel |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9711004 |
| URL | https://arxiv.org/abs/nucl-th/9711004 |
| DOI | 10.1103/PhysRevC.59.919 |
| Journal | Phys.Rev. C59 (1999) 919-927 |
Abstract
We present a dynamical study of $e^+e^-$ production in $\pi^-$A reactions at 1.3 and 1.7 GeV on the basis of the Coupled-Channel-BUU approach. The contributions from vector mesons ($\rho,\omega$) are calculated taking into account the collisional broadening effect and are compared to background sources in the dilepton spectrum from the Dalitz decays of $\omega$ and $\eta$ mesons produced in the reaction. Two possible scenarios for the medium modifications of the vector mesons are investigated, i.e. the 'dropping mass' scheme for the $\rho$ and $\omega$ and a momentum dependent $\rho$-meson spectral function that includes the polarization of the $\rho$-meson due to resonant $\rho -N$ scattering.
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"abstract": "We present a dynamical study of $e^+e^-$ production in $\\pi^-$A reactions at\n1.3 and 1.7 GeV on the basis of the Coupled-Channel-BUU approach. The\ncontributions from vector mesons ($\\rho,\\omega$) are calculated taking into\naccount the collisional broadening effect and are compared to background\nsources in the dilepton spectrum from the Dalitz decays of $\\omega$ and $\\eta$\nmesons produced in the reaction. Two possible scenarios for the medium\nmodifications of the vector mesons are investigated, i.e. the \u0027dropping mass\u0027\nscheme for the $\\rho$ and $\\omega$ and a momentum dependent $\\rho$-meson\nspectral function that includes the polarization of the $\\rho$-meson due to\nresonant $\\rho -N$ scattering.",
"arxiv_id": "nucl-th/9711004",
"authors": [
"Th. Weidmann",
"E. L. Bratkovskaya",
"W. Cassing",
"U. Mosel"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.59.919",
"journal_ref": "Phys.Rev. C59 (1999) 919-927",
"title": "$e^+e^-$ pairs from $\\pi^-$A reactions",
"url": "https://arxiv.org/abs/nucl-th/9711004"
},
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