Medium Dependence of the Vector-Meson Mass: Dynamical and/or Brown-Rho Scaling?

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dc.creatorBrown, G. E.
dc.creatorLi, G. Q.
dc.creatorRapp, R.
dc.creatorRho, M.
dc.creatorWambach, J.
dc.date1998-06-09
dc.date.accessioned2026-07-07T05:42:25Z
dc.date.available2026-07-07T05:42:25Z
dc.descriptionWe 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 $\sim$~$m_ρ/2$ are shown to be chiefly produced by a density-dependent $ρ$-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''.
dc.description13 pages LaTeX, incl. 5 eps-figures and appb.sty; Talk given at the Workshop on 'The Structure of Mesons, Baryons and Nuclei', Cracow, May 1998, in honor of J. Speth's 60th birthday, to be published in Acta Physica Polonica B
dc.identifierhttps://arxiv.org/abs/nucl-th/9806026
dc.identifierhttp://arxiv.org/abs/nucl-th/9806026
dc.identifierActa Phys.Polon. B29 (1998) 2309-2321
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/82924
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleMedium Dependence of the Vector-Meson Mass: Dynamical and/or Brown-Rho Scaling?
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