Hard scattering and QCD Fundamentals at RHIC
| dc.creator | Tannenbaum, M. J. | |
| dc.date | 2008-06-02 | |
| dc.date.accessioned | 2026-07-07T11:33:53Z | |
| dc.date.available | 2026-07-07T11:33:53Z | |
| dc.description | In 1998, at the 4th QCD workshop, Rolf Baier asked me whether jets could be measured in Au+Au collisions because he had a prediction of a QCD medium-effect (energy loss via soft gluon radiation induced by multiple scattering) on color-charged partons traversing a hot-dense-medium composed of screened color-charges. I reviewed the possibilities in a talk explaining that there was a general consensus that for Au+Au central collisions at $\sqrt{s_{NN}}=200$ GeV, leading particles are the only way to find jets because of the large particle density. The good news was that hard-scattering in p-p collisions was originally observed by the method of leading particles and that these techniques could be used to study hard-scattering and jets in Au+Au collisions. Notably, I described ``How everything you want to know about jets can be found using 2-particle correlations''. In fact, the predicted ``jet quenching'' and other new phenomena were discovered by this method. However, this past year, I had to soften the statement to {\em almost everything} because we found by explicit calculation in PHENIX that the away-side two-particle correlation $p_{T_a}$ spectrum from a $π^0$ trigger with $p_{T_t}$ is not sensitive to the fragmentation function--overturning a belief dating from the seminal paper of Feynman, Field and Fox in 1977. A new formula was derived which showed that the shape of the $p_{T_a}$ spectrum depends only on the power $n$ of the parton invariant cross section so that NLO pQCD calculations of the two particle away-side correlations are, in fact, less sensitive to the shape of the fragmentation function than calculations of the inclusive $π^0$ cross section. | |
| dc.description | 7 pages, 5 figures, Talk given at 9th Workshop on Non-Perturbative Quantum Chromodynamics, Paris, France, 4-8 Jun 2007 | |
| dc.identifier | https://arxiv.org/abs/0806.0301 | |
| dc.identifier | http://arxiv.org/abs/0806.0301 | |
| dc.identifier | ECONFC0706044:09,2007 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/198051 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Hard scattering and QCD Fundamentals at RHIC | |
| dc.type | text |