LIFETIME ESTIMATIONS AND A NONMONOTONIC INITIAL ENERGY DENSITY IN HEAVY ION COLLISIONS AT RHIC AND LHC

摘要

We highlight some connections between the final state hadronic observables and the initial conditions using a recently found exact family of solutions of relativistic hydrodynamics. These relations give explicit examples of the scaling behavior in relativistic hydrodynamics and provide an advanced estimate of the lifetime and the initial energy density in SNN~(1/2)= 62.4, 130, and 200 GeV Au + Au collisions at RHIC and SNN~(1/2)= 5.0 TeV Pb + Pb and 5.44 TeV Xe + Xe, as well as s~(1/2)= 7, 8 and 13 TeV p+p collisions at LHC energies. A surprising result is that these advanced estimates yield a nonmonotonic increase in the initial energy density with increasing collision energy at the RHIC energy range.