First measurement of the rho spectral function in nuclear collisions
| dc.creator | Damjanovic, S. | |
| dc.date | 2006-09-16 | |
| dc.date.accessioned | 2026-07-07T10:42:40Z | |
| dc.date.available | 2026-07-07T10:42:40Z | |
| dc.description | The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 AGeV In-In collisions. A strong excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size close to 400K events and the good mass resolution of about 2% made it possible to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum shows some non-trivial centrality dependence, but is largely consistent with a dominant contribution from pi+pi- ->rho ->mu+mu- annihilation. The associated rho spectral function exhibits considerable broadening, but essentially no shift in mass. The pT-differential mass spectra show the excess to be much stronger at low pT than at high pT. The results are compared to theoretical model predictions; they tend to rule out models linking hadron masses directly to the chiral condensate. | |
| dc.description | 6 pages, 9 figures, To appear in the proceedings of Hot Quarks 2006, Villasimius, Italy, 15-20 May 2006 | |
| dc.identifier | https://arxiv.org/abs/nucl-ex/0609026 | |
| dc.identifier | http://arxiv.org/abs/nucl-ex/0609026 | |
| dc.identifier | Eur.Phys.J.C49:235-241,2007 | |
| dc.identifier | doi:10.1140/epjc/s10052-006-0060-2 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/182025 | |
| dc.subject | Nuclear Experiment | |
| dc.title | First measurement of the rho spectral function in nuclear collisions | |
| dc.type | text |