scholarly journals Collectivity in Small Collision Systems: An Initial-State Perspective

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Sören Schlichting ◽  
Prithwish Tribedy
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Multiplicity ◽  
Striking Similarity ◽  
Initial State ◽  
Small Systems ◽  
Ion Collisions ◽  
Recent Developments ◽  
Characteristic Features

Measurements of multiparticle correlations in the collisions of small systems such as p+p, p/d/3He+A show striking similarity to the observations in heavy-ion collisions. A number of observables measured in the high-multiplicity events of these systems resemble features that are attributed to collectivity driven by hydrodynamics. However, alternative explanations based on initial-state dynamics are able to describe many characteristic features of these measurements. In this brief review, we highlight some of the recent developments and outstanding issues in this direction.

scholarly journals HYDRODYNAMIC MODELING OF HEAVY-ION COLLISIONS

2013 ◽  
Vol 28 (11) ◽  
pp. 1340011 ◽  
Author(s):  
CHARLES GALE ◽  
SANGYONG JEON ◽  
BJÖRN SCHENKE
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Initial State ◽  
Hydrodynamic Description ◽  
Hydrodynamic Simulations ◽  
Fundamental Properties ◽  
Ion Collisions ◽  
Viscous Hydrodynamic ◽  
Recent Developments ◽  
Successes And Challenges

We review progress in the hydrodynamic description of heavy-ion collisions, focusing on recent developments in modeling the fluctuating initial state and event-by-event viscous hydrodynamic simulations. We discuss how hydrodynamics can be used to extract information on fundamental properties of quantum chromodynamics from experimental data, and review successes and challenges of the hydrodynamic framework.

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.

scholarly journals ηQ Meson Photoproduction in Ultrarelativistic Heavy Ion Collisions

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Gong-Ming Yu ◽  
Gao-Gao Zhao ◽  
Zhen Bai ◽  
Yan-Bing Cai ◽  
Hai-Tao Yang ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Heavy Quarkonium ◽  
Color Singlet ◽  
Initial State ◽  
Color Octet ◽  
Ion Collisions ◽  
The Matrix

The transverse momentum distributions for inclusive ηc,b meson described by gluon-gluon interactions from photoproduction processes in relativistic heavy ion collisions are calculated. We considered the color-singlet (CS) and color-octet (CO) components within the framework of Nonrelativistic Quantum Chromodynamics (NRQCD) in the production of heavy quarkonium. The phenomenological values of the matrix elements for the color-singlet and color-octet components give the main contribution to the production of heavy quarkonium from the gluon-gluon interaction caused by the emission of additional gluon in the initial state. The numerical results indicate that the contribution of photoproduction processes cannot be negligible for midrapidity in p-p and Pb-Pb collisions at the Large Hadron Collider (LHC) energies.

scholarly journals Recent developments in particle yield fluctuation measurements

2019 ◽  
Vol 204 ◽  
pp. 03003
Author(s):  
Igor Altsybeev
Keyword(s):  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Initial State ◽  
Average Transverse Momentum ◽  
Correlation Studies ◽  
Ion Collisions ◽  
Particle Yield ◽  
Different Types ◽  
Recent Developments ◽  
Dynamical Fluctuations

In relativistic heavy-ion collisions, properties of the initial state and effects arising during evolution of the medium, such as a transition between the hadronic and partonic phases, should reflect themselves in event-by-event fluctuations of the number of produced particles. In this paper, recentmeasurements of several event-by-event observables, namely, dynamical fluctuations of relative particle yields and forwardbackward correlations of different types, are discussed. Also, new observables for forward-backward correlation studies are proposed: correlations between ratios of identified particle yields in two separated acceptance intervals and the correlation between the ratio in one interval and average transverse momentum in another.

scholarly journals Viscous Hydrodynamic Model for Relativistic Heavy Ion Collisions

2013 ◽  
Vol 2013 ◽  
pp. 1-25 ◽  
Author(s):  
A. K. Chaudhuri
Keyword(s):  
Experimental Data ◽  
Heavy Ion Collisions ◽  
Initial Conditions ◽  
Heavy Ion ◽  
High Energy ◽  
Relativistic Heavy Ion Collisions ◽  
Ion Collisions ◽  
Viscous Hydrodynamic ◽  
Recent Developments ◽  
Hydrodynamical Modeling

Viscous hydrodynamical modeling of relativistic heavy ion collisions has been highly successful in explaining bulk of the experimental data in RHIC and LHC energy collisions. We briefly review viscous hydrodynamics modeling of high energy nuclear collisions. Basic ingredients of the modeling, the hydrodynamic equations, relaxation equations for dissipative forces, are discussed. Hydrodynamical modeling being a boundary value problem, we discuss the initial conditions, freeze-out process. We also show representative simulation results in comparison with experimental data. We also discuss the recent developments in event-by-event hydrodynamics.

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