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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 present a perturbative calculation of the neutron matter equation of state based on low-momentum two-and three-nucleon interactions. Our results are compared to the model-independent virial equation of state and to variational calculations, and we provide theoretical error estimates by varying the cutoff used to regulate nuclear interactions. In addition(More)
Nucleon-nucleon (NN) interactions are well constrained for relative momenta k 2 fm −1 by existing scattering data [1]. The model dependences for larger momenta can be seen, for instance, in the 3 P 2 superfluid pairing gaps for Fermi momenta k F > 2 fm −1 [2]. In Ref. [3], we study in detail the dependence of the 1 S 0 superfluid gap on nuclear interactions(More)