"Heavy quarkonium as a probe of hot QCD"
Relatore: Prof Mikko Laine- University of Bielefeld (D)
25 Settembre 2008 ore 14.00
|The spectral function of heavy quarkonium is an observable
possessing both a theoretically transparent connection to heavy ion
phenomenology, and a non-trivial qualitative change as a function of
the temperature, making it a conceptually clean probe of deconfined
QCD matter. It has consequently been estimated with many tools, such
as potential models, lattice QCD, and AdS/CFT techniques. I review some
basic facts concerning this observable, and discuss then recent progress
on its determination, by approaching the physically relevant range from
the high temperature and heavy quark-mass side, where the spectral
function can be computed systematically in the weak-coupling expansion.