dorsal/arxiv
View SchemaModifications of the Rho Meson from the Virtual Pion Cloud in Hot and Dense Matter
| Authors | M. Urban, M. Buballa, R. Rapp, J. Wambach |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9910004 |
| URL | https://arxiv.org/abs/nucl-th/9910004 |
| DOI | 10.1016/S0375-9474(00)00125-1 |
| Journal | Nucl.Phys.A673:357-374,2000 |
Abstract
The modification of the rho-meson self-energy due to the coupling to in-medium pions is calculated consistently at finite baryon density and temperature, keeping the full 3-momentum dependence in a gauge invariant way. As a function of nucleon density, the rho-meson spectral function is strongly enhanced in the invariant mass region M < 650 MeV, while the maximum, i.e. the pole mass, is slightly shifted upwards. As a function of temperature, for fixed nucleon density, the imaginary part of the self-energy increases further due to Bose-enhancement. At the same time the mass shift from the real part becomes very large. As a consequence of these medium effects, the dilepton rate in the low-mass region M < 650 MeV increases strongly, while the peak at M = 770 MeV disappears.
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"abstract": "The modification of the rho-meson self-energy due to the coupling to\nin-medium pions is calculated consistently at finite baryon density and\ntemperature, keeping the full 3-momentum dependence in a gauge invariant way.\nAs a function of nucleon density, the rho-meson spectral function is strongly\nenhanced in the invariant mass region M \u003c 650 MeV, while the maximum, i.e. the\npole mass, is slightly shifted upwards. As a function of temperature, for fixed\nnucleon density, the imaginary part of the self-energy increases further due to\nBose-enhancement. At the same time the mass shift from the real part becomes\nvery large. As a consequence of these medium effects, the dilepton rate in the\nlow-mass region M \u003c 650 MeV increases strongly, while the peak at M = 770 MeV\ndisappears.",
"arxiv_id": "nucl-th/9910004",
"authors": [
"M. Urban",
"M. Buballa",
"R. Rapp",
"J. Wambach"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1016/S0375-9474(00)00125-1",
"journal_ref": "Nucl.Phys.A673:357-374,2000",
"title": "Modifications of the Rho Meson from the Virtual Pion Cloud in Hot and Dense Matter",
"url": "https://arxiv.org/abs/nucl-th/9910004"
},
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