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A transverse momentum differential global analysis of Heavy Ion Collisions

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arxiv 2010.15130 v2 pith:VGI4BUF6 submitted 2020-10-28 nucl-th hep-phnucl-ex

A transverse momentum differential global analysis of Heavy Ion Collisions

classification nucl-th hep-phnucl-ex
keywords collisionscoefficientsfreeglobalheavymodelmomentumphase
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The understanding of heavy ion collisions and its quark-gluon plasma 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 $p$Pb collisions. We do this in a global model fit including a free streaming prehydrodynamic phase with variable velocity $v_\text{fs}$, 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 bulk viscosity is small and even consistent with zero.

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