Publication : t09/099
Effects of partial thermalization on HBT interferometry
Gombeaud C. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)Lappi T. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Ollitrault J.-Y. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Abstract:Année de publication : 2009
Hydrodynamical models have generally failed to describe interferometry radii measured at RHIC. In order to investigate this ``HBT puzzle'', we carry out a systematic study of HBT radii in ultrarelativistic heavy-ion collisions within a two-dimensional transport model. We compute the transverse radii $R_o$ and $R_s$ as functions of $p_t$ for various values of the Knudsen number, which measures the degree of thermalization in the system. For realistic values of the Knudsen number estimated from $v_2$ data, we obtain $R_o/R_s simeq 1.2$, much closer to data than standard hydrodynamical results. Femtoscopic observables vary little with the degree of thermalization. Azimuthal oscillations of the radii in non central collisions do not provide a good probe of thermalization.
Revue : Nucl. Phys. A 830 817c-820c (2009)
Conférence - Communication : par Clement Gombeaud; The 21st International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 2009) ; Knoxville, TN ; 2009-03-30 / 2009-04-04
DOI : doi:10.1016/j.nuclphysa.2009.10.075
Preprint : arXiv:0907.1392
Langue : Anglais
