Heavy quarkonium as a probe of thermal QCD

por Mikko Laine (Bielefeld University)

lunes 3 dic. 2007 15:00 → 16:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

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 temperature range from the high-temperature side, where the spectral function can be computed systematically in (resummed) weak-coupling expansion.