dorsal/arxiv
View SchemaMedium Dependence of the Vector-Meson Mass: Dynamical and/or Brown-Rho Scaling?
| Authors | G. E. Brown, G. Q. Li, R. Rapp, M. Rho, J. Wambach |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9806026 |
| URL | https://arxiv.org/abs/nucl-th/9806026 |
| Journal | Acta Phys.Polon. B29 (1998) 2309-2321 |
Abstract
We discuss the similarities and differences for the theories of Rapp, Wambach and collaborators (called R/W in short) and those based on Brown-Rho scaling (called B/R), as applied to reproduce the dileptons measured by the CERES collaboration in the CERN experiments. In both theories the large number of dileptons at invariant masses $\sim$~$m_\rho/2$ are shown to be chiefly produced by a density-dependent $\rho$-meson mass. In R/W the medium dependence is dynamically calculated using hadronic variables defined in the matter-free vacuum. In B/R scaling it follows from movement towards chiral symmetry restoration due to medium-induced vacuum change, and is described in terms of constituent (or quasiparticle) quarks. We argue that the R/W description should be reliable up to densities somewhat beyond nuclear density, where hadrons are the effective variables. At higher density there should be a crossover to constituent quarks as effective variables scaling according to B/R. In the crossover region, the two descriptions must be ``dual''.
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"abstract": "We discuss the similarities and differences for the theories of Rapp, Wambach\nand collaborators (called R/W in short) and those based on Brown-Rho scaling\n(called B/R), as applied to reproduce the dileptons measured by the CERES\ncollaboration in the CERN experiments. In both theories the large number of\ndileptons at invariant masses $\\sim$~$m_\\rho/2$ are shown to be chiefly\nproduced by a density-dependent $\\rho$-meson mass. In R/W the medium dependence\nis dynamically calculated using hadronic variables defined in the matter-free\nvacuum. In B/R scaling it follows from movement towards chiral symmetry\nrestoration due to medium-induced vacuum change, and is described in terms of\nconstituent (or quasiparticle) quarks. We argue that the R/W description should\nbe reliable up to densities somewhat beyond nuclear density, where hadrons are\nthe effective variables. At higher density there should be a crossover to\nconstituent quarks as effective variables scaling according to B/R. In the\ncrossover region, the two descriptions must be ``dual\u0027\u0027.",
"arxiv_id": "nucl-th/9806026",
"authors": [
"G. E. Brown",
"G. Q. Li",
"R. Rapp",
"M. Rho",
"J. Wambach"
],
"categories": [
"nucl-th",
"hep-ph"
],
"journal_ref": "Acta Phys.Polon. B29 (1998) 2309-2321",
"title": "Medium Dependence of the Vector-Meson Mass: Dynamical and/or Brown-Rho Scaling?",
"url": "https://arxiv.org/abs/nucl-th/9806026"
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