Du-Juan Wang

Λpolarization in peripheral heavy ion collisions

F. Becattini, L.P. Csernai, D.J. Wang 1 University of Florence and INFN Florence, Italy 2 Frankfurt Institute for Advanced Studies (FIAS), Johann Wolfgang Goethe University, Germany 3 Institute of Physics and Technology, University of Bergen, Allegaten 55, 5007 Bergen, Norway 4 Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China. (Dated: May 11, 2014)

Flow Vorticity in Peripheral High Energy Heavy Ion Collisions

Vorticity development is studied in the reaction plane of peripheral relativistic heavy-ion reactions where the initial state has substantial angular momentum. The earlier predicted rotation effect and Kelvin Helmholtz instability lead to significant initial vorticity and circulation. In low-viscosity quark gluon plasma this vorticity remains still significant at the time of freeze-out of the system, even if damping due to explosive expansion and dissipation decreases the vorticity and circulation. In the reaction plane the vorticity arises from the initial angular momentum, and it is stronger than in the transverse plane, where vorticity is caused by random fluctuations only.

Viscous potential flow analysis of peripheral heavy ion collisions

The conditions for the development of a Kelvin-Helmholtz Instability (KHI) for the Quark-gluon Plasma (QGP) flow in a peripheral heavy-ion collision is investigated. The projectile and target side particles are separated by an energetically motivated hypothetical surface, characterized with a phenomenological surface tension. In such a view, a classical potential flow approximation is considered and the onset of the KHI is studied. The growth rate of the instability is computed as function of phenomenological parameters characteristic for the QGP fluid: viscosity, surface tension and flow layer thickness.

Global Λ polarization in high energy collisions

With a Yang-Mills flux-tube initial state and a high resolution (3+1)D Particle-in-Cell Relativistic (PICR) hydrodynamics simulation, we calculate the

Rotation in an exact hydrodynamical model

\Lambda

Λ polarization in peripheral collisions at moderately relativistic energies

polarization for different energies. The origination of polarization in high energy collisions is discussed, and we find linear impact parameter dependence of the global

New method to detect rotation in high-energy heavy-ion collisions

\Lambda

QGP flow fluctuations and the characteristics of higher moments

polarization. Furthermore, the global

Turbulence, Vorticity and Lambda Polarization

\Lambda

Directed flow from global symmetry and initial state Fluctuations

polarization in our model decreases very fast in the low energy domain, and the decline curve fits well the recent results of Beam Energy Scan (BES) program launched by the STAR collaboration at the Relativistic Heavy Ion Collider (RHIC). The time evolution of polarization is also discussed.