First measurement of the rho spectral function in nuclear collisions
Nuclear Experiment
2007-05-23 v1
Abstract
The NA60 experiment has studied low-mass muon pairs in 158 AGeV Indium-Indium collisions at the CERN SPS. A strong excess of pairs is observed above the expectation from neutral meson decays. The unprecedented sample size of 360 000 events and the good mass resolution of about 2% allow to isolate the excess by subtraction of the known sources. The shape of the resulting mass spectrum is consistent with a dominant contribution from pi+ pi- -> rho -> mu+ mu- annihilation. The associated rho spectral function shows a strong broadening, but essentially no shift in mass.
Keywords
Cite
@article{arxiv.nucl-ex/0510044,
title = {First measurement of the rho spectral function in nuclear collisions},
author = {S. Damjanovic},
journal= {arXiv preprint arXiv:nucl-ex/0510044},
year = {2007}
}
Comments
4 pages, 3 figures, Proceedings of Quark Matter 2005, Budapest