Transverse Momentum Differential Global Analysis of Heavy-Ion Collisions.

Physical Review Letters
Govert NijsRaimond Snellings

Abstract

The understanding of heavy ion collisions and its quark-gluon plasma (QGP) formation requires a complicated interplay of rich physics in a wealth of experimental data. In this work we compare for identified particles the transverse momentum dependence of both the yields and the anisotropic flow coefficients for both PbPb and pPb collisions. We do this in a global model fit including a free streaming prehydrodynamic phase with variable velocity v_{fs}, thereby widening the scope of initial conditions. During the hydrodynamic phase we vary three second order transport coefficients. The free streaming velocity has a preference slightly below the speed of light. In this extended model the QGP bulk viscosity is small and even consistent with zero.

References

Aug 11, 2001·Physical Review Letters·G PolicastroA O Starinets
Dec 18, 2013·Physical Review Letters·Wilke van der ScheeScott Pratt
Jun 6, 2015·Physical Review Letters·Scott PrattHui Wang
Apr 16, 2016·Physical Review Letters·J AdamUNKNOWN ALICE Collaboration
Dec 5, 2017·The European Physical Journal. C, Particles and Fields·M AaboudUNKNOWN ATLAS Collaboration

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