What the NA60 dilepton data can tell
Abstract
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, we present a study comparing different models for the in-medium modification of vector mesons. In particular, we investigate what can be learned about collisional broadening by a medium at finite temperature and baryon density and what model independent constraints can be obtained from the data. Of special relevance is a comparison to -cuts of the dilepton spectra. Those not only provide independent tests of the evolution model and -dependence of the spectral function but also unambiguously decide if the observed yield in the higher mass spectrum is mainly due to the hot phase of the evolution or four pion annihilation processes.
Keywords
Cite
@article{arxiv.hep-ph/0605130,
title = {What the NA60 dilepton data can tell},
author = {Thorsten Renk and Jorg Ruppert},
journal= {arXiv preprint arXiv:hep-ph/0605130},
year = {2007}
}