Medium Modification of Jet Shapes and Jet Multiplicities

Details Medium Modification of Jet Shapes and Jet Multiplicities Medium Modification of Jet Shapes and Jet Multiplicities

2003-10-07

arxiv.org/abs/hep-ph/0310079v2

Phys.Rev.Lett. 93 (2004) 042301

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, Latex, 3 eps figures. version2: error in eq. (6) corrected, Fig. 2 changed accordingly, conclusions unchanged

Scientific paper

10.1103/PhysRevLett.93.042301

Medium-induced parton energy loss is widely considered to underly the suppression of high-pt leading hadron spectra in 200 GeV/A Au+Au collisions at RHIC. Its description implies a characteristic kt-broadening of the subleading hadronic fragments associated to the hard parton. However, this latter effect is more difficult to measure and remained elusive so far. Here, we discuss how it affects genuine jet observables which are accessible at LHC and possibly at RHIC. We find that the kt-broadening of jet multiplicity distributions provides a very sensitive probe of the properties of dense QCD matter, whereas the sensitivity of jet energy distributions is much weaker. In particular, the sensitive kinematic range of jet multiplicity distributions is almost unaffected by the high multiplicity background.

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