Chiral Symmetry in Nuclei -- Theoretical Expectations and Hard Facts

Abstract

It is widely believed that chiral symmetry is restored not only at high temperatures, but also at high nuclear densities. The drop of the order parameter of the chiral phase transition, the chiral condensate, with density has indeed been calculated in various models and is as such a rather robust result. In this talk I point out that the connection of this property with actual observables is far less clear. For this task a good hadronic description of the primary production of hadrons, their propagation inside the nuclear medium, their decay and the propagation of the decay products through the medium to the detector all have to be treated with equal accuracy and weight. In this talk I illustrate with the examples of $\omega$ production and ${\pi }^0{\pi }^0$ production how important in particular final state interactions are.

Invited Talk at Chiral07, Osaka, Japan, Nov. 13 - 16, 2007

References in corpus (8)

• NA60 results on the rho spectral function in In-In collisions
• The spectral function of the omega meson in nuclear matter from a coupled-channel resonance model
• Three-body collisions in Boltzmann-Uehling-Uhlenbeck theory
• The influence of the nuclear medium on inclusive electron and neutrino scattering off nuclei
• Low-energy pions in nuclear matter and 2pi photoproduction within a BUU transport model
• Pion induced double charge exchange reactions in the Delta resonance region
• Double pion photoproduction off 40Ca
• Hadrons in Medium -- Theory confronts experiment