Dileptons, Charm and Charmonium at Finite Temperature and Chemical Potential

Details Dileptons, Charm and Charmonium at Finite Temperature and Chemical Potential Dileptons, Charm and Charmonium at Finite Temperature and Chemical Potential

2009-08-23

arxiv.org/abs/0908.3344v1

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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