Special Issue "Heavy Ion Collisions"

A special issue of Universe (ISSN 2218-1997).

Deadline for manuscript submissions: closed (10 June 2019)

Special Issue Editor

Guest Editor
Prof. Dr. Maria Vasileiou

Department of Physics, University of Athens, Zografou Campus, GR-15784, Athens, Greece
Website | E-Mail
Interests: heavy ion physics

Special Issue Information

Dear Colleagues,

The main goal of heavy ion collisions is to study the physics of strongly interacting matter at the highest energy densities that have been reached so far in the laboratory. In such a condition, an extreme phase of matter—called the quark-gluon plasma—is formed. Our universe is thought to have been in such a primordial state for the first few millionths of a second after the Big Bang. The properties of such a phase are key issues for quantum chromodynamics, the understanding of confinement–deconfinement, and chiral phase transitions.

In contrast to the expectations that the QGP would have properties similar to the almost ideal, weakly coupled gas of quarks and gluons, the experimental results from the Relativistic Heavy Ion Collider (RHIC) have shown that a hot, strongly interacting, nearly perfect, and almost opaque liquid was produced in central Au–Au collisions at the greatest RHIC energy.

The first collisions of lead nuclei, delivered by the CERN Large Hadron Collider (LHC) at the end of 2010, at a centre-of-mass energy per nucleon pair,  = 2.76 TeV, marked the beginning of a new era in ultra-relativistic heavy-ion physics. The study of the properties of the produced hot and dense strongly-interacting matter at these unprecedented energies is currently experimentally being pursued by all four big LHC experiments—ALICE, ATLAS, CMS, and LHCb. The aim of this Special Issue is to present the most recent results on the topic of heavy ion physics in both theory and experiment.

Prof. Dr. Maria Vasileiou
Guest Editor

Manuscript Submission Information

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Keywords

  • quark gluon plasma
  • quantum chromodynamics
  • confinement–deconfinement
  • RHIC
  • LHC
  • ALICE
  • ATLAS
  • CMS
  • LHCb
  • heavy ion physics
  • strongly interacting matter

Published Papers (3 papers)

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Research

Open AccessArticle
Energy Dependent Chemical Potentials of Light Particles and Quarks from Yield Ratios of Antiparticles to Particles in High Energy Collisions
Universe 2019, 5(6), 152; https://doi.org/10.3390/universe5060152
Received: 27 April 2019 / Revised: 4 June 2019 / Accepted: 11 June 2019 / Published: 14 June 2019
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Abstract
We collect the yields of charged pions (π and π+), charged kaons (K and K+), anti-protons (p¯), and protons (p) produced in mid-rapidity interval (in most cases) in central gold–gold [...] Read more.
We collect the yields of charged pions ( π and π + ), charged kaons ( K and K + ), anti-protons ( p ¯ ), and protons (p) produced in mid-rapidity interval (in most cases) in central gold–gold (Au–Au), central lead–lead (Pb–Pb), and inelastic or non-single-diffractive proton–proton ( p p ) collisions at different collision energies. The chemical potentials of light particles and quarks are extracted from the yield ratios, π / π + , K / K + , and p ¯ / p , of antiparticles to particles over an energy range from a few GeV to above 10 TeV. At a few GeV (∼4 GeV), the chemical potentials show, and the yield ratios do not show, different trends comparing with those at other energies, although the limiting values of the chemical potentials and the yield ratios at very high energy are 0 and 1, respectively. Full article
(This article belongs to the Special Issue Heavy Ion Collisions)
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Open AccessArticle
Influence of Finite Volume Effect on the Polyakov Quark–Meson Model
Received: 20 March 2019 / Revised: 15 April 2019 / Accepted: 22 April 2019 / Published: 24 April 2019
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Abstract
In the current work, we study the influence of a finite volume on 2+1SU(3) Polyakov Quark–Meson model (PQM) order parameters, (fluctuations) correlations of conserved charges and the quark–hadron phase boundary. Our study of the PQM model [...] Read more.
In the current work, we study the influence of a finite volume on 2 + 1 S U ( 3 ) Polyakov Quark–Meson model (PQM) order parameters, (fluctuations) correlations of conserved charges and the quark–hadron phase boundary. Our study of the PQM model order parameters and the (fluctuations) correlations of conserved charges indicates a sizable shift of the quark–hadron phase boundary to higher values of baryon chemical potential ( μ B ) and temperature (T) for decreasing the system volume. The detailed study of such effect could have important implications for the extraction of the (fluctuations) correlations of conserved charges of the QCD phase diagram from heavy ion data. Full article
(This article belongs to the Special Issue Heavy Ion Collisions)
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Open AccessArticle
Perturbative Peculiarities of Quantum Field Theories at High Temperatures
Received: 13 February 2019 / Revised: 6 March 2019 / Accepted: 6 March 2019 / Published: 14 March 2019
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Abstract
Revisiting the fast fermion damping rate calculation in a thermalized QED and/or QCD plasma in thermal equilibrium at four-loop order, focus is put on a peculiar perturbative structure which has no equivalent at zero-temperature. Not surprisingly, and in agreement with previous C [...] Read more.
Revisiting the fast fermion damping rate calculation in a thermalized QED and/or QCD plasma in thermal equilibrium at four-loop order, focus is put on a peculiar perturbative structure which has no equivalent at zero-temperature. Not surprisingly, and in agreement with previous C -algebraic analyses, this structure renders the use of thermal perturbation theory more than questionable. Full article
(This article belongs to the Special Issue Heavy Ion Collisions)
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