Lifetime estimations from RHIC Au + Au data

Gábor Kasza, T. Csörgő

Research output: Contribution to journalArticle

Abstract

We discuss a recently found family of exact and analytic, finite and accelerating, (1 + 1)-dimensional solutions of perfect fluid relativistic hydrodynamics to describe the pseudorapidity densities and longitudinal HBT-radii and to estimate the lifetime parameter and the initial energy density of the expanding fireball in Au+Au collisions at RHIC with sNN = 130 GeV and 200 GeV colliding energies. From these exact solutions of relativistic hydrodynamics, we derive a simple and powerful formula to describe the pseudorapidity density distributions in high-energy proton-proton and heavy-ion collisions, and derive the scaling of the longitudinal HBT radius parameter as a function of the pseudorapidity density. We improve upon several oversimplifications in Bjorken's famous initial energy density estimate, and apply our results to estimate the initial energy densities of high-energy reactions with data-driven pseudorapidity distributions. When compared to similar estimates at the LHC energies, our results indicate a surprising and nonmonotonic dependence of the initial energy density on the energy of heavy-ion collisions.

Original languageEnglish
JournalInternational Journal of Modern Physics A
DOIs
Publication statusAccepted/In press - Jan 1 2019

Fingerprint

flux density
life (durability)
estimates
ionic collisions
hydrodynamics
radii
fireballs
energy
proton energy
density distribution
scaling
collisions
protons
fluids

Keywords

  • HBT-radii
  • initial energy density
  • longitudinal flow
  • pseudorapidity distribution
  • quark-gluon plasma
  • rapidity distribution
  • Relativistic hydrodynamics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

Cite this

Lifetime estimations from RHIC Au + Au data. / Kasza, Gábor; Csörgő, T.

In: International Journal of Modern Physics A, 01.01.2019.

Research output: Contribution to journalArticle

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