Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-28
AIPConf.Proc.964:232-237,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Proceedings of the International Workshop on QCD - Martina Franca (Italy), June 2007. To be published in AIP. 6 pages, 6 figur
Scientific paper
10.1063/1.2823856
The ultra-relativistic heavy-ion program at RHIC has shown that at intermediate transverse momenta ($p_T \simeq 2$-6 GeV) standard (independent) parton fragmentation can neither describe the observed baryon-to-meson ratios nor the empirical scaling of the hadronic elliptic flow ($v_2$) according to the number of valence quarks. Both aspects find instead a natural explanation in a coalescence plus fragmentation approach to hadronization. After a brief review of the main results for light quarks, we focus on heavy quarks showing that a combined fragmentation and quark-coalescence framework is relevant also here. Moreover, within relativistic Langevin simulations we find evidence for the importance of heavy-light resonances in the Quark-Gluon Plasma (QGP) to explain the strong energy loss and collective flow of heavy-quark spectra as inferred from non-photonic electron observables. Such heavy-light resonances can pave the way to a unified understanding of the microscopic structure of the QGP and its subsequent hadronization by coalescence.
Greco Vincenzo
Hees Hendrik van
Rapp Ralf
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