# QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

## Spectra, flow and HBT in PbPb collisons at the LHC

May 23, 2011, 4:20 PM
20m
Salle de l'Europe (Imperial Palace)

### Salle de l'Europe

#### Imperial Palace

Parallel Global and collective dynamics

### Speaker

Piotr Bozek (IFJ PAN Krakow/ Rzeszow University)

### Description

The expansion of the fireball created in Pb-Pb collisions at $\sqrt{s}=2.76$TeV is modelled using the relativistic viscous hydrodynamics. The experimentally observed interferometry radii are well reproduced. The recent data of the ALICE Collaboration on the elliptic flow as function of the centrality can be very well described using the hydrodynamic expansion of a fluid with a small shear viscosity $\eta/s=0.08$. The elliptic flow as function of the transverse momentum shows systematic deviations from a hydrodynamic behavior in the small momenta region $p_\perp<800$MeV. It indicates that a non-negligible contribution of non-thermalized particles from jet fragmentation is present.

### Primary author

Piotr Bozek (IFJ PAN Krakow/ Rzeszow University)

 Slides