scholarly journals Viscous Hydrodynamic Description of the Pseudorapidity Density and Energy Density Estimation for Pb+Pb and Xe+Xe Collisions at the LHC

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 112
Author(s):  
Xiong-Tao Gong ◽  
Ze-Fang Jiang ◽  
Duan She ◽  
C. B. Yang
Keyword(s):  
Energy Density ◽  
Density Estimation ◽  
Initial Energy ◽  
Hydrodynamic Description ◽  
Estimation Formula ◽  
Initial Energy Density ◽  
New Energy ◽  
Viscous Hydrodynamic ◽  
Bulk Energy ◽  
Pseudorapidity Density

Based on the analytical solution of accelerating relativistic viscous fluid hydrodynamics and Buda–Lund model, the pseudorapidity distributions of the most central Pb+Pb and Xe+Xe collisions are presented. Inspired by the CNC model, a modified energy density estimation formula is presented to investigate the dependence of the initial energy density estimation on the viscous effect. This new energy density estimation formula shows that the bulk energy is deposited to the neighboring fluid cells in the presence of the shear viscosity and bulk viscosity. In contrast to the well-known CNC energy density estimation formula, a 4.9% enhancement of the estimated energy density at the LHC kinematics is shown.

scholarly journals Lifetime estimations from RHIC Au+Au data

2019 ◽  
Vol 34 (26) ◽  
pp. 1950147 ◽  
Author(s):  
Gábor Kasza ◽  
Tamás Csörgő
Keyword(s):  
Energy Density ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Energy ◽  
Initial Energy ◽  
Relativistic Hydrodynamics ◽  
Nonmonotonic Dependence ◽  
Ion Collisions ◽  
Initial Energy Density ◽  
Pseudorapidity Density

We discuss a recently found family of exact and analytic, finite and accelerating, [Formula: see text]-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[Formula: see text]+[Formula: see text]Au collisions at RHIC with [Formula: see text] 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.

scholarly journals Initial Energy Density of √ s = 7 and 8 TeV p+p Collisions at the LHC

2016 ◽  
Author(s):  
Mate Csanad ◽  
Tamas Csorgo ◽  
Ze-Fang Jiang ◽  
Chun-Bin Yang
Keyword(s):  
Energy Density ◽  
Critical Energy ◽  
High Energy ◽  
Initial Energy ◽  
High Multiplicity ◽  
Initial Energy Density ◽  
Critical Energy Density ◽  
High Energy Collisions ◽  
8 Tev ◽  
Natural Description

Accelerating, exact, explicit and simple solutions of relativistic hydrodynamics allow for a simple and natural description of highly relativistic p+p collisions. These solutions yield a finite rapidity distribution, thus they lead to an advanced estimate of the initial energy density of high energy collisions. We show that such an advanced estimate yields an initial energy density in $\sqrt{s}=7$ and 8 TeV p+p collisions at LHC around or above the critical energy density from lattice QCD, and a corresponding initial temperature above the critical temperature from QCD and the Hagedorn temperature. This suggests that the collision energy of the LHC corresponds to a large enough initial energy density to create a non-hadronic perfect fluid even in pp collisions. %We also show, that several times the %critical energy density may have been reached in high multiplicity events, hinting at a non-hadronic medium created in %high multiplicity $\sqrt{s}=7$ and 8 TeV p+p collisions.

scholarly journals Initial Energy Density of √s = 7 and 8 TeV p–p Collisions at the LHC

Universe ◽  
2017 ◽  
Vol 3 (1) ◽  
pp. 9 ◽  
Author(s):  
Máté Csanád ◽  
Tamás Csörgő ◽  
Ze-Fang Jiang ◽  
Chun-Bin Yang
Keyword(s):  
Energy Density ◽  
Initial Energy ◽  
Initial Energy Density ◽  
8 Tev

Initial energy density distribution in high energy heavy ion reactions

1988 ◽  
Vol 214 (4) ◽  
pp. 657-659 ◽  
Author(s):  
G.N. Fowler ◽  
F.S. Navarra ◽  
M. Plümer ◽  
A. Vourdas ◽  
R.M. Weiner ◽  
...  
Keyword(s):  
Energy Density ◽  
Density Distribution ◽  
Heavy Ion ◽  
High Energy ◽  
Initial Energy ◽  
Energy Density Distribution ◽  
Heavy Ion Reactions ◽  
Initial Energy Density
Sign in / Sign up

Export Citation Format

Share Document