Global fluid fits to identified particle transverse momentum spectra from heavy-ion collisions at the Large Hadron Collider

摘要

A bstract Transverse momentum spectra of identified particles produced in heavy-ion collisions at the Large Hadron Collider are described with relativistic fluid dynamics. We perform a systematic comparison of experimental data for pions, kaons and protons up to a transverse momentum of 3 GeV /c with calculations using the F luid u M code package to solve the evolution equations of fluid dynamics, the T r ENT o model to describe the initial state and the F ast R eso code to take resonance decays into account. Using data in five centrality classes at the center-of-mass collision energy per nucleon pair s NN documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ sqrt{s_{mathrm{NN}}} $$end{document} = 2 . 76 TeV, we determine systematically the most likely parameters of our theoretical model including the shear and bulk viscosity to entropy ratios, the initialization time, initial density and freeze-out temperature through a global search and quantify their posterior probability. This is facilitated by the very efficient numerical implementation of F luid u M and F ast R eso . Based on the most likely model parameters we present predictions for the transverse momentum spectra of multi-strange hadrons as well as identified particle spectra from Pb-Pb collisions at s NN documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ sqrt{s_{mathrm{NN}}} $$end{document} = 5 . 02 TeV.