Azimuthal structure of charged particle emission in 28Si–Ag/Br interaction at 14.5A GeV and 32S–Ag/Br interaction at 200A GeV

2014 ◽  
Vol 23 (05) ◽  
pp. 1450027 ◽  
Author(s):  
Provash Mali ◽  
Amitabha Mukhopadhyay ◽  
Soumya Sarkar ◽  
Gurmukh Singh
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Particle Emission ◽  
Photographic Emulsion ◽  
Quantum Molecular Dynamics ◽  
Emission Data ◽  
Shock Wave Formation ◽  
A Charge ◽  
Bose Einstein ◽  
Charged Particle Emission

Presence of unusual azimuthal structures in the particle emission data obtained from the 28 Si – Ag / Br interaction at 14.5A GeV and from the 32 S – Ag / Br interaction at 200A GeV, are investigated in the framework of the Cherenkov gluon emission and/or Mach shock wave formation in nuclear/partonic medium. Nuclear photographic emulsion technique is used to collect the experimental data. The experiment is compared with the predictions of two simulations, namely (i) the Relativistic Quantum Molecular Dynamics (RQMD) and (ii) the Ultra-relativistic Quantum Molecular Dynamics (UrQMD). A charge reassignment algorithm is implemented over the outputs of the simulations to mimic the Bose–Einstein correlation (BEC) effect. Our analysis confirms presence of jet-like structures in both experiments beyond statistical noise. Such structures are more pronounced in the 32 S data than in the 28 Si data.

scholarly journals Wavelet Analysis of Shower Track Distribution in High-Energy Nucleus-Nucleus Collisions

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Provash Mali ◽  
Soumya Sarkar ◽  
Amitabha Mukhopadhyay ◽  
Gurmukh Singh
Keyword(s):  
Wavelet Analysis ◽  
Cluster Formation ◽  
High Energy ◽  
Multiparticle Production ◽  
Quantum Molecular Dynamics ◽  
Emission Data ◽  
Local Cluster ◽  
Local Maxima ◽  
A Charge ◽  
Bose Einstein

A continuous wavelet analysis is performed for pattern recognition of charged particle emission data in28Si-Ag/Br interaction at 14.5A GeV and in32S-Ag/Br interaction at 200A GeV. Making use of the event-wise local maxima present in the scalograms, we try to identify the collective behavior in multiparticle production, if there is any. For the first time, the wavelet results are compared with a model prediction based on the ultrarelativistic quantum molecular dynamics (UrQMD), where we adopt a charge reassignment algorithm to modify the UrQMD events to mimic the Bose-Einstein type of correlation among identical mesons—a feature known to be the most dominating factor responsible for local cluster formation. Statistically significant deviations between the experiment and the simulation are interpreted in terms of nontrivial dynamics of multiparticle production.

Bose-Einstein correlations of pion pairs and kaon pairs from relativistic quantum molecular dynamics

1993 ◽  
Vol 70 (20) ◽  
pp. 3000-3003 ◽  
Author(s):  
J. P. Sullivan ◽  
M. Berenguer ◽  
B. V. Jacak ◽  
S. Pratt ◽  
M Sarabura ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics ◽  
Bose Einstein

scholarly journals Calculations of Bose-Einstein correlations from Relativistic Quantum Molecular Dynamics

1994 ◽  
Vol 566 ◽  
pp. 531-534 ◽  
Author(s):  
J.P. Sullivan ◽  
M. Berenguer ◽  
D.E. Fields ◽  
B.V. Jacak ◽  
M. Sarabura ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics ◽  
Bose Einstein

Relativistic quantum molecular dynamics and the collision 40Ca−40Ca at Elab/A = 1.05 GeV

1991 ◽  
Vol 268 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Tomoyuki Maruyama ◽  
Guoqiang Li ◽  
Amand Faessler
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics

scholarly journals Particle ratios within EPOS, UrQMD and thermal models at AGS, SPS and RHIC energies

2021 ◽  
Vol 30 (08) ◽  
Author(s):  
Mahmoud Hanafy ◽  
Abdel Nasser Tawfik ◽  
Muhammad Maher ◽  
Werner Scheinast
Keyword(s):  
Molecular Dynamics ◽  
Phase Transitions ◽  
Hybrid Model ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics ◽  
Thermal Models ◽  
Particle Ratios ◽  
Statistical Ensembles ◽  
The Ideal

The particle ratios [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] measured at AGS, SPS and RHIC energies are compared with large statistical ensembles of 100,000 events deduced from the CRMC EPOS [Formula: see text] and the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) hybrid model. In the UrQMD hybrid model two types of phase transitions are taken into account. All these data are then confronted with the ideal Hadron Resonance Gas Model. The two types of phase transitions are apparently indistinguishable. Apart from [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], the UrQMD hybrid model agrees well with the CRMC EPOS [Formula: see text]. We also conclude that the CRMC EPOS [Formula: see text] seems to largely underestimate [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text].

scholarly journals Relativistic hadron-hadron collisions in the ultra-relativistic quantum molecular dynamics model

1999 ◽  
Vol 25 (9) ◽  
pp. 1859-1896 ◽  
Author(s):  
M Bleicher ◽  
E Zabrodin ◽  
C Spieles ◽  
S A Bass ◽  
C Ernst ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics ◽  
Dynamics Model

Forward–backward multiplicity correlation and event-by-event multiplicity fluctuation in nucleus–nucleus collisions at 200A GeV

2021 ◽  
pp. 2150021
Author(s):  
Sanjib Kumar Manna ◽  
Amitabha Mukhopadhyay ◽  
Provash Mali
Keyword(s):  
Transport Model ◽  
Relativistic Quantum ◽  
Cluster Formation ◽  
Simulated Data ◽  
Correlation Effect ◽  
Quantum Molecular Dynamics ◽  
Particle Correlation ◽  
Statistical Measures ◽  
Singly Charged ◽  
Bose Einstein

Correlation among singly charged particles emitted in the forward and backward pseudo-rapidity cones is measured in [Formula: see text]O-Ag/Br and [Formula: see text]S-Ag/Br interactions at an incident energy of [Formula: see text] GeV/nucleon. Event-by-event fluctuations in the charged particle multiplicities and their pseudo-rapidity values are also investigated in terms of some known statistical measures. Evidences of short-ranged particle correlation and cluster formation in the pseudo-rapidity space are found from our analysis. A microscopic transport model based on the Ultra-relativistic Quantum Molecular Dynamics could not match the experimental results. The differences between experimental observation and corresponding simulation could neither be accounted for even when a Bose–Einstein type of correlation effect is implemented into the simulated data.

Multifractal analysis of charged particle distributions using horizontal visibility graph and sandbox algorithm

2017 ◽  
Vol 32 (08) ◽  
pp. 1750024 ◽  
Author(s):  
P. Mali ◽  
A. Mukhopadhyay ◽  
S. K. Manna ◽  
P. K. Haldar ◽  
G. Singh
Keyword(s):  
Model Simulation ◽  
Relativistic Quantum ◽  
Monte Carlo Model ◽  
High Energy ◽  
Quantum Molecular Dynamics ◽  
Network Systems ◽  
Emission Data ◽  
Horizontal Visibility ◽  
Particle Distributions ◽  
200 Gev

Horizontal visibility graphs (HVGs) and the sandbox (SB) algorithm usually applied for multifractal characterization of complex network systems that are converted from time series measurements, are used to characterize the fluctuations in pseudorapidity densities of singly charged particles produced in high-energy nucleus–nucleus collisions. Besides obtaining the degree distribution associated with event-wise pseudorapidity distributions, the common set of observables, typical of any multifractality measurement, are studied in [Formula: see text]O-Ag/Br and [Formula: see text]S-Ag/Br interactions, each at an incident laboratory energy of 200 GeV/nucleon. For a better understanding, we systematically compare the experiment with a Monte Carlo model simulation based on the Ultra-relativistic Quantum Molecular Dynamics (UrQMD). Our results suggest that the HVG-SB technique is an efficient tool that can characterize multifractality in multiparticle emission data, and in some cases, it is even superior to other methods more commonly used in this regard.

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