SEMINARIO DE FISICA TEORICA I Y II

Titulo:         Quarkonium Spectral Functions and Euclidean Correlators in the QGP: a T-matrix Approach
Conferenciante: Daniel Cabrera-Urban (Cyclotron Institute, Texas A&M University)
Dia y hora:     30, 14:15 (Aula 7)

Resumen:

We study the evolution of heavy quarkonium states with temperature in a
Quark Gluon Plasma (QGP) by evaluating the in-medium Q-bar{Q} T-matrix
within a reduced Bethe-Salpeter equation. This provides a unified
treatment of bound and scattering states including threshold effects and
the transition to the (pQCD) continuum. The interaction kernel is
extracted from finite-temperature QCD lattice calculations of the
singlet-free energy of a Q-bar{Q} pair. The bound states are found to
gradually move above the Q-bar{Q} threshold after which they rapidly
dissolve in the hot system. We use the T-matrix to calculate Q-bar{Q}
spectral and Euclidean-time correlation functions which are compared to
lattice QCD results. We furthermore investigate the impact of finite-width
effects on the single-quark propagators as estimated from recent
applications of heavy-quark rescattering to RHIC data