Constraints on rapidity-dependent initial conditions from charged particle pseudorapidity densities and correlations at the LHC

• Published in: Nuclear and particle physics proceedings Vol. 289-290; pp. 483 - 486
• Main Authors: Ke, Weiyao, Scott Moreland, J., Bernhard, Jonah E., Bass, Steffen A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2017
• Subjects: charged particle density; initial condition; two-particle correlation; charged particle density; initial condition; two-particle correlation
• ISSN: 2405-6014; 2405-6022
• DOI: 10.1016/j.nuclphysbps.2017.05.113

The initial three-dimensional entropy distribution of the quark-gluon plasma produced in relativistic heavy-ion collision is systematically studied using parametric initial conditions. We apply a cumulant generating function approach to parametrize the rapidity dependence of local entropy deposition and extend the boost-invariant initial condition model TRENTo to include longitudinal structure. Two different parametrizations are tested and their parameters optimized by comparing to centrality dependent charged particle pseudorapidity densities of p+Pb (5.02A TeV) and Pb+Pb (2.76A TeV) using Bayesian inference. Successful parametrizations are then selected based on their ability to describe two-particle psuedorapidity correlations. Finally, we predict the pseudorapidity dependent flows and event-plane decorrelations using the optimized initial conditions and a 3+1D hybrid hydro+micro model.