Vector mesons in dense matter

Abstract

We will summarize the progress in understanding the changes in the vector meson spectral density in nuclear medium using the constraint equations obtained from the Borel transformed dispersion relation and QCD Operator Product Expansion. We will discuss the results for the scalar mass shift and dispersion effects (three momentum dependence) for the light quark system ($\rho ,\omega$), the strange quark system ($\varphi$) and the heavy quark system ($J/\psi$) in nuclear medium. For the light quark systems, a nontrivial change in the mass and width are expected, while the dispersion effects are found to be small. Existing model calculations for the dispersion effects are compared to the constraint equation in detail. Very small, but accurate mass shift is obtained for the heavy quark system.

8 pages, invited talk given at the KEK-Tanashi symposium on Physics of Hadrons and Nuclei, December 14-17 1998, Tokyo, Japan

References in corpus (9)

• Current correlation functions, QCD sum rules and vector mesons in baryonic matter
• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• The Spectral Function of the Rho Meson in Nuclear Matter
• What QCD sum rules tell about the rho meson
• Is J/psi-Nucleon Scattering Dominated by the Gluonic van der Waals Interaction?
• Vector mesons in medium with finite three momentum
• Proton-Proton Spin Correlations at Charm Threshold and Quarkonium Bound to Nuclei
• Medium Dependence of the Vector-Meson Mass: Dynamical and/or Brown-Rho Scaling?
• Vector mesons in nuclear medium with small three momentum, a QCD sum rule approach

Cited by in corpus (3)

• rho -> pi pi decay in nuclear medium
• pi^0 -> gamma gamma*, omega -> pi^0 gamma*, and rho -> pi gamma* decays in nuclear medium
• $K_1^{\pm }$ mesons moving in nuclear matter