Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-23
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 24 figures, Proc. of 5. Int. Conf. on Critical Point and Onset of Deconfinement, BNL, June 08-12, 2009
Scientific paper
We discuss how dileptons, open charm and charmonia may be utilized in heavy-ion collisions to extract information specific to hot and dense matter at finite quark chemical potential, $\mu_q$. For each observable we briefly discuss underlying theoretical frameworks and the current status in interpreting available heavy-ion data at SPS and RHIC energies. Low-mass dileptons are particularly sensitive to baryonic medium effects in spectral modifications of the $\rho$ meson, and may serve as an accurate measure of the fireball lifetime. In the open-charm sector, observable signals may be generated by a ``critical'' enhancement of scattering rates via $t$-channel exchange of a soft $\sigma$ mode. For charmonia, finite-$T$ potential models could be used to extrapolate color-screening effects to finite $\mu_q$ to facilitate a quantitative evaluation of dissociation rates in the medium.
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