Jet Tomography of Hot and Cold Nuclear Matter
Abstract
Modification of parton fragmentation functions by multiple scattering and gluon bremsstrahlung in nuclear media is shown to describe very well the recent HERMES data in deeply inelastic scattering, giving the first evidence of the A2/3 dependence of the modification. The energy loss is found to be <dE/dL>~0.5 GeV/fm for a 10-GeV quark in an Au nucleus. Including the effect of expansion, analysis of the π0 spectra in central Au+Au collisions at (s)=130 GeV yields an averaged energy loss equivalent to <dE/dL>~7.3 GeV/fm in a static medium. Predictions for central Au+Au collisions at (s)=200 GeV are also given.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2002
- DOI:
- arXiv:
- arXiv:hep-ph/0202105
- Bibcode:
- 2002PhRvL..89p2301W
- Keywords:
-
- 12.38.Mh;
- 13.60.-r;
- 24.85.+p;
- 25.75.-q;
- Quark-gluon plasma;
- Photon and charged-lepton interactions with hadrons;
- Quarks gluons and QCD in nuclei and nuclear processes;
- Relativistic heavy-ion collisions;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment;
- Nuclear Experiment;
- Nuclear Theory
- E-Print:
- 4 pages in RevTex with 3 ps figures, final version published in Phys. Rev. Letters