scholarly journals QGP droplet formation in small asymmetric collision systems

2020 ◽  
Vol 235 ◽  
pp. 02006
Author(s):  
Thomas A. Trainor
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Hydrodynamic Model ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Droplet Formation ◽  
Broad Context ◽  
Initial State ◽  
Small Systems ◽  
Theoretical Assumptions

The journal Nature recently published a letter titled "Creating small circular, elliptical, and triangular droplets of quark-gluon plasma" [1]. The basis for that claim is a combination of measured Fourier amplitudes v2 and v3 from collision systems p-Au, d-Au and h-Au (helion h is the nucleus of atom 3He), Glauber Monte Carlo estimates of initial-state transverse collision geometries for those systems and hydrodynamic Monte Carlo descriptions of the vn data. Apparent correspondence between hydrodynamic model vn trends and data trends is interpreted as confirmation of “collectivity” occurring in the small collision systems, further interpreted to indicate QGP formation. QGP formation in small systems runs counter to pre-RHIC theoretical assumptions that QGP formation should require large collision systems (e.g. central A-A collisions). There is currently available a broad context of experimental data from p-p, A-A and p-Pb collisions at the RHIC and LHC against which the validity of the Nature letter claims may be evaluated. This talk provides a summary of such results and their implications. [1] Nature Phys. 15, no. 3, 214 (2019).

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.

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.

Quantum Monte Carlo Simulations of Strongly Coupled Quark-Gluon Plasma

2012 ◽  
Vol 52 (2) ◽  
pp. 135-139 ◽  
Author(s):  
V. S. Filinov ◽  
M. Bonitz ◽  
Y.B. Ivanov ◽  
P.R. Levashov ◽  
V.E. Fortov
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Quark Gluon Plasma ◽  
Quantum Monte Carlo ◽  
Gluon Plasma ◽  
Strongly Coupled ◽  
Quantum Monte Carlo Simulations

scholarly journals QUESTIONS AND PROSPECTS IN QUARKONIUM POLARIZATION MEASUREMENTS FROM PROTON–PROTON TO NUCLEUS–NUCLEUS COLLISIONS

2012 ◽  
Vol 27 (23) ◽  
pp. 1230022 ◽  
Author(s):  
PIETRO FACCIOLI
Keyword(s):  
Experimental Data ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
The Other ◽  
Proton Antiproton ◽  
Proton Proton ◽  
Experimental Knowledge ◽  
Polarization Measurements ◽  
Systematic Effects

Polarization measurements are the best instrument to understand how quark and antiquark combine into the different quarkonium states, but no model has so far succeeded in explaining the measured J/ψ and ϒ polarizations. On the other hand, the experimental data in proton–antiproton and proton–nucleus collisions are inconsistent, incomplete and ambiguous. New analyses will have to properly address often underestimated issues: the existence of azimuthal anisotropies, the dependence on the reference frame, the influence of the experimental acceptance on the comparison with other measurements and with theory. Additionally, a recently developed frame-invariant formalism will provide an alternative and often more immediate physical viewpoint and, at the same time, will help probing systematic effects due to experimental biases. The role of feed-down decays from heavier states, a crucial missing piece in the current experimental knowledge, will have to be investigated. Ultimately, quarkonium polarization measurements will also offer new possibilities in the study of the properties of the quark–gluon plasma.

scholarly journals Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

2021 ◽  
Vol 10 (5) ◽  
Author(s):  
Kostya Trachenko ◽  
Vadim Brazhkin ◽  
matteo Baggioli
Keyword(s):  
Experimental Data ◽  
Quark Gluon Plasma ◽  
Dynamic Viscosity ◽  
Kinematic Viscosity ◽  
Gluon Plasma ◽  
Particle Dynamics ◽  
Fundamental Physical Constants ◽  
Two Systems ◽  
Fundamental Physical ◽  
Dynamical Crossover

Recently, it has been found that the kinematic viscosity of liquids at the minimum, \nu_mνm, can be expressed in terms of fundamental physical constants, giving \nu_mνm on the order of 10^{-7}~{m^2/s}10−7m2/s. Here, we show that the kinematic viscosity of quark-gluon plasma (QGP) has a similar value and support this finding by experimental data and theoretical estimations. The similarity is striking, given that the dynamic viscosity and the density of QGP are about 16 orders of magnitude larger than in liquids and that the two systems have disparate interactions and fundamental theories. We discuss the implications of this result for understanding the QGP including the similarity of flow and particle dynamics at the viscosity minimum, the associated dynamical crossover and universality of shear diffusivity.

scholarly journals Quarkonia dynamics in the QGP with open quantum systems

2022 ◽  
Vol 258 ◽  
pp. 05009
Author(s):  
Stéphane Delorme ◽  
Thierry Gousset ◽  
Roland Katz ◽  
Pol-Bernard Gossiaux
Keyword(s):  
Real Time ◽  
Quark Gluon Plasma ◽  
Open Quantum Systems ◽  
Gluon Plasma ◽  
Quantum Systems ◽  
Master Equations ◽  
Temperature Evolution ◽  
One Dimension ◽  
Initial State ◽  
Time Dynamics

We investigate the real-time dynamics of a correlated heavy quarkantiquark pair inside the Quark-Gluon Plasma using new quantum master equations derived from first QCD principles and based on the work of Blaizot & Escobedo [4]. The full equations are directly numerically solved in one-dimension to reduce computing costs and is used to gain insight on the dynamics in both a static and evolving medium following a Björken-like temperature evolution. The effect of the initial state on the dynamics is also studied.

scholarly journals COLOR GLASS CONDENSATE AND GLASMA

2013 ◽  
Vol 28 (01) ◽  
pp. 1330001 ◽  
Author(s):  
FRANÇOIS GELIS
Keyword(s):  
Quark Gluon Plasma ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
High Energy ◽  
Effective Theory ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Saturation Regime ◽  
Initial State ◽  
Ion Collisions

We review the color glass condensate effective theory, that describes the gluon content of a high energy hadron or nucleus, in the saturation regime. The emphasis is put on applications to high energy heavy ion collisions. After describing initial state factorization, we discuss the glasma phase, that precedes the formation of an equilibrated quark–gluon plasma. We end this review with a presentation of recent developments in the study of the isotropization and thermalization of the quark–gluon plasma.

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