Seminar in Hadronic Physics

What does the rho-meson do? NA60's dimuon experiment and in-medium modifications of vector-mesons

Joerg Ruppert

McGill University

The NA60 experiment has studied low-mass muon pair production in In- In collisions at 158 AGeV with unprecedented precision. Thus, there is hope that the in-medium modifications of the vector meson spectral function can be constrained more thoroughly than from previous experiments. Towards this goal, I present a study comparing different models for the in-medium modification of vector mesons. In particular, I investigate what can be learned about collisional broadening by a medium and what model independent constraints can be obtained from the data. I also report on the status of scaling rho mass models in comparison to NA60's data.