scholarly journals Centrality Dependence of Multiplicity Fluctuations in Ion-Ion Collisions from the Beam Energy Scan at FAIR

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Anuj Chandra ◽  
Bushra Ali ◽  
Shakeel Ahmad
Keyword(s):  
Beam Energy ◽  
Relativistic Quantum ◽  
Heavy Ion ◽  
Quantum Molecular Dynamics ◽  
Ion Collisions ◽  
Statistical Fluctuations ◽  
The Central Limit Theorem ◽  
Urqmd Model ◽  
Multiplicity Distributions ◽  
Beam Energy Scan

Multiplicity distributions and event-by-event multiplicity fluctuations in AuAu collisions at energies in future heavy-ion experiment at the Facility for Anti-proton and Ion Research (FAIR) are investigated. Events corresponding to FAIR energies are simulated in the frame work of Ultra Relativistic Quantum Molecular Dynamics (URQMD) model. It is observed that the mean and the width of multiplicity distributions monotonically increase with beam energy. The trend of variations of dispersion with mean number of participating nucleons for the centrality-bin width of 5% are in accord with the Central Limit Theorem. The multiplicity distributions in various centrality bins as well as for full event samples are observed to obey Koba, Nielsen and Olesen (KNO) scaling. The trends of variations of scaled variance with beam energy are also found to support the KNO scaling predictions for larger collision centrality. The findings also reveal that the statistical fluctuations in 5% centrality-bin width appear to be under control.

scholarly journals INFLUENCE OF STATISTICAL FLUCTUATIONS ON K/π RATIOS IN RELATIVISTIC HEAVY ION COLLISIONS

2001 ◽  
Vol 16 (07) ◽  
pp. 1227-1235 ◽  
Author(s):  
C. B. YANG ◽  
X. CAI
Keyword(s):  
Negative Binomial ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Relative Variance ◽  
Ion Collisions ◽  
Statistical Fluctuations ◽  
Binomial Distributions ◽  
The Mean ◽  
Multiplicity Distributions ◽  
Statistical Background

The influence of pure statistical fluctuations on K/π ratio is investigated in an event-by-event way. Poisson and the modified negative binomial distributions are used as the multiplicity distributions since they both have statistical background. It is shown that the distributions of the ratio in these cases are Gaussian, and the mean and relative variance are given analytically.

scholarly journals Review of Critical Point Searches and Beam-Energy Studies

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 8 ◽  
Author(s):  
Fabian Rennecke
Keyword(s):  
Phase Diagram ◽  
Critical Point ◽  
Beam Energy ◽  
Particle Number ◽  
Phase Diagram Of Qcd ◽  
Theoretical Perspective ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Introductory Overview ◽  
Beam Energy Scan

I give an introductory overview of the search for the critical point in the phase diagram of QCD in the context of heavy-ion collisions from a theoretical perspective. The focus is on static and dynamic critical physics and the corresponding properties of particle number fluctuations as relevant examples of promising observables for signatures of a critical point in beam-energy scan experiments.

scholarly journals Bulk properties of the medium produced in relativistic heavy-ion collisions from the beam energy scan program

2017 ◽  
Vol 96 (4) ◽  
Author(s):  
L. Adamczyk ◽  
J. K. Adkins ◽  
G. Agakishiev ◽  
M. M. Aggarwal ◽  
Z. Ahammed ◽  
...  
Keyword(s):  
Beam Energy ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Bulk Properties ◽  
Ion Collisions ◽  
Beam Energy Scan

scholarly journals Directed Flow in Microscopic Models in Relativistic A+A Collisions

Universe ◽  
2019 ◽  
Vol 5 (3) ◽  
pp. 69 ◽  
Author(s):  
Larissa Bravina ◽  
Yurii Kvasiuk ◽  
Sergey Sivoklokov ◽  
Oleksandr Vitiuk ◽  
Evgeny Zabrodin
Keyword(s):  
Relativistic Quantum ◽  
Mean Field ◽  
String Model ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Quantum Molecular Dynamics ◽  
Transport Models ◽  
Directed Flow ◽  
Ion Collisions ◽  
Microscopic Models

Evolution of directed flow of charged particles produced in relativistic heavy-ion collisions at energies 4 ≤ s ≤ 19.6 GeV is considered within two microscopic transport models, ultra-relativistic quantum molecular dynamics (UrQMD) and quark-gluon string model (QGSM). In both models, the directed flow of protons changes its sign at midrapidity from antiflow to normal flow with decreasing energy of collisions, whereas the flows of mesons and antiprotons remain antiflow-oriented. For lighter colliding systems, such as Cu+Cu or S+S, changing of the proton directed flow occurs at lower bombarding energies and for more central topologies compared to a heavy Au+Au system. The differences can be explained by dissimilar production zones of different hadrons and by the influence of spectators. Directed flows of most abundant hadronic species at midrapidity are found to be formed within t = 10–12 fm/c after the beginning of nuclear collision. The influence of hard and soft mean-field potentials on the directed flow is also studied.

TWO-PARTICLE CORRELATION IN HEAVY-ION COLLISIONS AT CSR ENERGY

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2200-2204
Author(s):  
JINGBO ZHANG ◽  
QICHUN FENG ◽  
LEI HUO ◽  
WEINING ZHANG
Keyword(s):  
Imaging Technique ◽  
Final State Interaction ◽  
Relativistic Quantum ◽  
Heavy Ion ◽  
Quantum Molecular Dynamics ◽  
Dynamics Model ◽  
Final State ◽  
Particle Correlation ◽  
Ion Collisions ◽  
The Relationship

The predictions of the two-particle correlation by using the relativistic quantum molecular dynamics model are presented for the heavy-ion reactions at HIRFL-CSR energy. The two-proton correlation function with the final state interaction is calculated with the Lednicky code for the U + U collisions at beam energy 520 A MeV. Applying the imaging technique, the relationship between the freeze-out spatial distributions and the results of correlation femtoscopy is investigated. We find that one can reliably reconstruct the source functions from the two-particle correlation functions with ignoring the degree of space-momentum correlations at this energy. The results are useful to the designing the hadron detector at CSR.

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