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We study the changes in the partial decay widths of excited charmonium states into D ¯ D, when the D meson mass decreases in nuclear matter, taking the internal structure of the hadrons into account. Calculations within the 3P0 model for ψ(3686) and ψ(3770) imply that naive estimates of the in-medium widths based only on phase space are grossly exaggerated.(More)
Renormalization group methods can be applied to the nuclear many-body problem using the approach proposed by Shankar. We start with the two-body low momentum interaction V low k and use the RG flow from the particle-hole channels to calculate the full scattering amplitude in the vicinity of the Fermi surface. This is a new straightforward approach to the(More)
The properties of vector mesons in nuclear matter are discussed. Results for the momentum dependence of the ρ-meson self energy in matter due to ρN interactions are presented, and consequences for the production rate of e + e − pairs in hot and dense matter are discussed. I also examine the constraints imposed by elementary processes on the widths of ρ and(More)
Many interactive computer applications can with advantage be built after the menu principle. MGEN is a program that automatically builds a skeleton of a menu driven program. It is a well known problem that users of programs normally cannot state what they really want until they see the finished program running. With MGEN, the resulting program can be(More)
We construct a relativistic and unitary approach to 'high' energy pion-and photon-nucleon reactions taking the πN, π∆, ρN , ωN , ηN, KΛ, KΣ final states into account. Our scheme dynamically generates the sand d-wave nucleon resonances terms of quasi-local interaction vertices. The description of photon-induced processes is based on a generalized(More)
We construct an equation-of-state for nuclear matter based on the chiral Lagrangian. The relevant scales are discussed and an effective chiral power expansion scheme, which is constructed to work around the nuclear saturation density, is presented. A realistic equation-of-state is obtained by adjusting one free parameter, when the leading and subleading(More)
Using the QCD operator product expansion, we derive the real part of the transverse and longitudinal vector-vector correlation function with the quantum numbers of the ρ and ω mesons to leading order in density and three momentum (q 2) for ω 2 → −∞. The operator product expansion provides, through the Borel transformed energy dispersion relation, a model(More)