Suppression of High Transverse Momentum $π^0$ Spectra in Au+Au Collisions at RHIC
| dc.creator | Kahana, D. E. | |
| dc.creator | Kahana, S. H. | |
| dc.date | 2007-07-20 | |
| dc.date.accessioned | 2026-07-07T11:17:57Z | |
| dc.date.available | 2026-07-07T11:17:57Z | |
| dc.description | Au+Au, $s^{1/2} = 200$ A GeV measurements at RHIC, obtained with the PHENIX, STAR, PHOBOS and BRAHMS detectors, have all indicated a suppression of neutral pion production, relative to an appropriately normalized NN level. For central collisions and vanishing pseudo-rapidity these experiments exhibit suppression in charged meson production, especially at medium to large transverse momenta. In the PHENIX experiment similar behavior has been reported for $π^0$ spectra. In a recent work on the simpler D+Au interaction, to be considered perhaps as a tune-up for Au+Au, we reported on a pre-hadronic cascade mechanism which explains the mixed observation of moderately reduced $p_\perp$ suppression at higher pseudo-rapidity as well as the Cronin enhancement at mid-rapidity. Here we present the extension of this work to the more massive ion-ion collisions. Our major thesis is that much of the suppression is generated in a late stage cascade of colourless pre-hadrons produced after an initial short-lived coloured phase. We present a pQCD argument to justify this approach and to estimate the time duration $τ_p$ of this initial phase. Of essential importance is the brevity in time of the coloured phase existence relative to that of the strongly interacting pre-hadron phase. The split into two phases is of course not sharp in time, but adequate for treating the suppression of moderate and high $p_\perp$ mesons. | |
| dc.description | 19 pages, 10 figures | |
| dc.identifier | https://arxiv.org/abs/0707.2990 | |
| dc.identifier | http://arxiv.org/abs/0707.2990 | |
| dc.identifier | J.Phys.G35:025102,2008 | |
| dc.identifier | doi:10.1088/0954-3899/35/2/025102 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/193181 | |
| dc.subject | Nuclear Theory | |
| dc.title | Suppression of High Transverse Momentum $π^0$ Spectra in Au+Au Collisions at RHIC | |
| dc.type | text |