Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c
| dc.creator | CERES Collaboration | |
| dc.creator | Adamova, D. | |
| dc.date | 2006-11-13 | |
| dc.date | 2008-07-31 | |
| dc.date.accessioned | 2026-07-07T12:00:04Z | |
| dc.date.available | 2026-07-07T12:00:04Z | |
| dc.description | We present a measurement of $e^+e^-$ pair production in central Pb-Au collisions at 158$A$ GeV/$c$. As reported earlier, a significant excess of the $e^+e^-$ pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the $ρ$ spectral function over a density-dependent shift of the $ρ$ pole mass. The in-medium broadening model implies that baryon induced interactions are the key mechanism to in-medium modifications of the $ρ$-meson in the hot fireball at SPS energy. | |
| dc.description | Revised version | |
| dc.identifier | https://arxiv.org/abs/nucl-ex/0611022 | |
| dc.identifier | http://arxiv.org/abs/nucl-ex/0611022 | |
| dc.identifier | Phys.Lett.B666:425-429,2008 | |
| dc.identifier | doi:10.1016/j.physletb.2008.07.104 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/206771 | |
| dc.subject | Nuclear Experiment | |
| dc.title | Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c | |
| dc.type | text |