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Quark Matter 2006 : High-p T and jets
| Content Provider | Semantic Scholar |
|---|---|
| Author | Leeuwen, Marco Van |
| Copyright Year | 2007 |
| Abstract | An overview of new experimental results on high-pT particle production and jets in heavy ion collisions from the Quark Matter 2006 conference is presented. In these proceedings, I will summarise new results on high-pT particle production and jet-like correlations from Quark Matter 2006. The large statistic data sample collected at RHIC in p+p, Cu+Cu and Au+Au provides access to increasingly high pT and allows to explore the intermediate pT regime in more detail. At the highest pT , we explore our understanding of the ’perturbative limit’ where hadron production and energy loss calculations are relatively well controlled. This allows to extract characteristics of in-medium fragmentation and ultimately to measure the energy density or even the temperature of the medium in heavy ion collisions [1]. At intermediate pT , a number of surprising effects has been observed, such as the large baryon/meson ratio [2–4] and strong modifications of triggered di-hadron correlations [5, 6]. An intriguing new result in this area is the observation of correlated particle production associated with jets at large rapidity separation ∆η. Also of special interest are jet-like correlations of identified particles, because these may shed light on the origin of the baryon/meson enhancement at intermediate pT . It should be noted that this field is also developing at SPS: at the previous Quark Matter and also in this meeting, a number of new analyses were presented of nuclear modification factors for hadron production ranging up to pT = 4 − 5 GeV. New results exist from NA49 [7], NA57 [8] and WA98 [9]. So far, it seems that at SPS energies the Cronin effect plays a large role, also due to the intrinsically limited pT -reach at low √ sNN . 1. RAA and the medium density The suppression of high-pT particle production compared to a properly scaled p+p reference was the first indication of significant parton energy loss at RHIC. At this year’s conference, a detailed quantitative confrontation of various models with the measured nuclear modification factor RAA of π , reaching out to pT = 20 GeV, was presented [10]. The left panel of Fig. 1 shows the data and curves from the PQM model [11], using different values of the medium density, expressed as the time-averaged Quark Matter 2006: High-pT and jets 2 ) c (GeV/ T p 0 2 4 6 8 10 12 14 16 18 20 A A R |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/nucl-ex/0702011v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Energy, Physics Fatigue Fragmentation (computing) Heavy Ions IBM 1401 Symbolic Programming System Mesons Perturbation theory Ploidies SEPHS1 gene Xfig Zero suppression collision |
| Content Type | Text |
| Resource Type | Article |
