Kernphysikalisches Kolloquium
Kernphysikalisches Kolloquium
Location: Physics Building, Science Campus Riedberg, Max-von-Laue-Str. 1, room __.102 (ground floor)
Time: Wednesday, April 25, 2012, 15:00-16:00 (plus 10min for discussion)
Contact: hees@fias.uni-frankfurt.de
The suppression of quarkonia has been studied as a probe of the quark gluon plasma (QGP) properties for 25 years, either by Debye screening of the interaction between the Q-Qbar pair (Matsui and Satz) or via gluo-dissociation of quarkonia states, which remain strongly bound (Kharzeev). However, the comparison between experimental data and theoretical scenarios including suppression mechanisms is not very conclusive.
An alternative track is to study not only the suppression but also the physical properties of quarkonia survivors in the QGP. In fact, recent SPS results showed a non-zero quarkonia elliptic flow. On the other hand, recent RHIC results suggest a strong thermalization of charm quarks in the medium. Therefore, this advises a small diffusion coefficient and a moderate final separation between the two constituents of the bound state at the transition phase. This would limit the J/Ψ suppression (suppression of the J/Ψ suppression). These results, among others, motivate the interest to be worn on the study of quarkonia dynamics in the QGP.
My talk will be focused on the study of physical aspects underlying the quarkonia propagation and collectivity in the QGP. This study is performed using a hydrodynamic transport model describing the evolution of a QQbar bound state in a hot fluid. The ingredients for this approach are, among others, the evaluation of elastic and inelastic quarkonium-gluon/hadron scattering processes and a relevant estimation of the collisional energy losses and stochastic forces of the thermal bath. I will discuss the theoretical framework we have developed by combining analytical calculations based on pQCD, phenomenological considerations and results from lQCD. The role of elastic scattering processes during the quarkonia propagation in the QGP has been demonstrated in our study. In addition, elements characterizing the collectivity of quarkonia in the medium were obtained