Energy density in small systems equal to the one in heavy-ion collisions

2016 ◽  
Vol 25 (07) ◽  
pp. 1642009 ◽  
Author(s):  
G. Paić ◽  
E. Cuautle
Keyword(s):  
Experimental Data ◽  
Energy Density ◽  
Quark Gluon Plasma ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Collective Effects ◽  
Small Systems ◽  
Ion Collisions ◽  
Recent Developments ◽  
The One

The recent developments in the study of quark–gluon matter at high densities have shown that there are many similarities between the behavior of the observables in light and heavy systems, especially when the light systems are observed at high multiplicities. Contrary to what was previously thought, the small systems do exhibit collective effects that could indicate that small droplets of strongly interacting quark–gluon plasma are possible. The results infer that the energy densities can be computed in light systems in the same way as in heavy systems and hence, the energy density should be considered when comparing systems with different sizes. We review some of the aspects as well as the existing main models and the way to disentangle them using experimental data.

PHOTON SUPPRESSION IN A BARYON-RICH PLASMA

1993 ◽  
Vol 08 (14) ◽  
pp. 1291-1296 ◽  
Author(s):  
A. DUMITRU ◽  
D. H. RISCHKE ◽  
H. STÖCKER ◽  
W. GREINER
Keyword(s):  
Energy Density ◽  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Photon Production ◽  
Ion Collisions ◽  
Chemical Potentials ◽  
Quark Gluon Plasmas ◽  
The Creation

We study photon production from quark-gluon plasmas with different baryo-chemical potentials µ B but fixed, given energy density ε. We find that the rate to lowest order O(ααs) decreases strongly with increasing µ B . Since to our knowledge µ B can be large in heavy-ion collisions, this result may be of importance concerning photon production as a signature for the creation of a quark-gluon plasma.

scholarly journals Particle Production and Collectivity in High Multiplicity pp and pPb at the LHC

2018 ◽  
Vol 171 ◽  
pp. 19007
Author(s):  
George S. F. Stephans
Keyword(s):  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Particle Production ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
High Multiplicity ◽  
Small Systems ◽  
Ion Collisions ◽  
Cms Detector

Recent unexpected evidence for collectivity in high multiplicity pp and pPb collisions at LHC energies has challenged the notion that such small systems do not exhibit any of the properties that have been used to study the quark gluon plasma in heavy ion collisions. An overview of recent results concerning particle production and collectivity in such collisions using the CMS detector at the LHC is presented.

Possible experimental signature of a quark–gluon plasma in a 12C–AgBr interaction at 4.5 GeV∙c−1∙n−1

1987 ◽  
Vol 65 (7) ◽  
pp. 719-722
Author(s):  
Dipak Ghosh ◽  
Jaya Roy ◽  
Ranjan Sengupta
Keyword(s):  
Experimental Data ◽  
Quark Gluon Plasma ◽  
Monte Carlo Analysis ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Relativistic Heavy Ion Collisions ◽  
Interaction Data ◽  
Dynamical Correlation ◽  
Ion Collisions ◽  
Angular Correlation Function

This paper reports possible evidence of a quark–gluon plasma (QGP) state formed in relativistic heavy-ion collisions using 12C–AgBr interaction data at 4.5 GeV∙c−1∙nucleon−1(n). The experimental data on the three-particle angular correlation function for the target protons have been subject to a Monte Carlo analysis, and a statistically significant deviation has been observed that shows a dynamical correlation among the target protons. This may be due to possible formation of a QGP state.

scholarly journals Review of Anisotropic Flow Correlations in Ultrarelativistic Heavy-Ion Collisions

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
You Zhou
Keyword(s):  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Model Calculations ◽  
Anisotropic Flow ◽  
Ion Collisions ◽  
Recent Developments ◽  
Flow Phenomena ◽  
Ultrarelativistic Heavy Ion Collisions

Anisotropic flow phenomena are a key probe of the existence of Quark-Gluon Plasma. Several new observables associated with correlations between anisotropic flow harmonics are developed, which are expected to be sensitive to the initial fluctuations and transport properties of the created matter in heavy-ion collisions. I review recent developments of correlations of anisotropic flow harmonics. The experimental measurements, together with the comparisons to theoretical model calculations, open up new opportunities of exploring novel QCD dynamics in heavy-ion collisions.

scholarly journals The First Moment of Azimuthal Anisotropy in Nuclear Collisions from AGS to LHC Energies

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Subhash Singha ◽  
Prashanth Shanmuganathan ◽  
Declan Keane
Keyword(s):  
Quark Gluon Plasma ◽  
Charged Particles ◽  
Theoretical Work ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Azimuthal Anisotropy ◽  
Flow Focusing ◽  
Nuclear Collisions ◽  
Ion Collisions ◽  
First Moment

We review topics related to the first moment of azimuthal anisotropy (v1), commonly known as directed flow, focusing on both charged particles and identified particles from heavy-ion collisions. Beam energies from the highest available, at the CERN LHC, down to projectile kinetic energies per nucleon of a few GeV per nucleon, as studied in experiments at the Brookhaven AGS, fall within our scope. We focus on experimental measurements and on theoretical work where direct comparisons with experiment have been emphasized. The physics addressed or potentially addressed by this review topic includes the study of Quark Gluon Plasma and, more generally, investigation of the Quantum Chromodynamics phase diagram and the equation of state describing the accessible phases.

Study and Investigation of Hard Photons Emission in Heavy Ion Collisions

2021 ◽  
Vol 19 (2) ◽  
pp. 61-65
Author(s):  
Taghreed A. Younis ◽  
Hadi J.M. Al-Agealy
Keyword(s):  
Critical Temperature ◽  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Heavy Ion Collision ◽  
Hard Photon ◽  
Ion Collisions ◽  
Strength Models ◽  
Ion Collision

This work involves hard photon rate production from quark -gluon plasma QGP interaction in heavy ion collision. Using a quantum chromodynamic model to investigate and calculation of photons rate in 𝑐𝑔 → 𝑠𝑔𝛾 system due to strength coupling, photons rate, temperature of system, flavor number and critical. The photons rate production computed using the perturbative strength models for QGP interactions. The strength coupling was function of temperature of system, flavor number and critical temperature. Its influenced by force with temperature of system, its increased with decreased the temperature and vice versa. The strength coupling has used to examine the confinement and deconfinement of quarks in QGP properties and influence on the photon rate production. In our approach, we calculate the photons rate depending on the strength coupling, photons rate and temperature of system with other factors. The results plotted as a function of the photons energy. The photons rate was decreased with increased temperature and increased with decreased with strength coupling.

scholarly journals On Pseudorapidity Distribution and Speed of Sound in High Energy Heavy Ion Collisions Based on a New Revised Landau Hydrodynamic Model

2015 ◽  
Vol 2015 ◽  
pp. 1-23 ◽  
Author(s):  
Li-Na Gao ◽  
Fu-Hu Liu
Keyword(s):  
Speed Of Sound ◽  
Hydrodynamic Model ◽  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
High Energy ◽  
Relativistic Heavy Ion Collider ◽  
Central Source ◽  
Ion Collisions

We propose a new revised Landau hydrodynamic model to study systematically the pseudorapidity distributions of charged particles produced in heavy ion collisions over an energy range from a few GeV to a few TeV per nucleon pair. The interacting system is divided into three sources, namely, the central, target, and projectile sources, respectively. The large central source is described by the Landau hydrodynamic model and further revised by the contributions of the small target/projectile sources. The modeling results are in agreement with the available experimental data at relativistic heavy ion collider, large hadron collider, and other energies for different centralities. The value of square speed of sound parameter in different collisions has been extracted by us from the widths of rapidity distributions. Our results show that, in heavy ion collisions at energies of the two colliders, the central source undergoes a phase transition from hadronic gas to quark-gluon plasma liquid phase; meanwhile, the target/projectile sources remain in the state of hadronic gas. The present work confirms that the quark-gluon plasma is of liquid type rather than being of a gas type.

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