What does the ρ-meson do? In-medium mass shift scenarios versus hadronic model calculations |
| |
Authors: | J Ruppert T Renk |
| |
Institution: | 1.Department of Physics,McGill University,Montréal,Canada;2.Department of Physics,Duke University,Durham,USA;3.Department of Physics,University of Jyv?skyl?,Jyv?skyl?,Finland;4.Helsinki Institut of Physics,University of Helsinki,Helsinki,Finland |
| |
Abstract: | The NA60 experiment has studied low-mass muon pair production in In–In collisions at 158 A GeV with unprecedented precision. With these results there is hope that the in-medium modifications of the vector meson spectral
function can be constrained more thoroughly than before. We investigate in particular what can be learned about collisional
broadening by a hot and dense medium and what constraints the experimental results put on in-medium mass shift scenarios.
The data show a clear indication of considerable in-medium broadening effects but disfavor mass shift scenarios where the
ρ-meson mass scales with the square root of the chiral condensate. Scaling scenarios which predict at finite density a dropping
of the ρ-meson mass that is stronger than that of the quark condensate are clearly ruled out since they are also accompanied
by a sharpening of the spectral function.
PACS 25.75.-q |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|