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### A Monte Carlo Study of Multiplicity Fluctuations in Pb-Pb Collisions at LHC Energies

Gupta, Ramni
Cornell University
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Title: A Monte Carlo Study of Multiplicity Fluctuations in Pb-Pb Collisions at LHC Energies
Author: Gupta, Ramni
Subject: Nuclear Experiment
Description: With large volumes of data available from LHC, it has become possible to study the multiplicity distributions for the various possible behaviours of the multiparticle production in collisions of relativistic heavy ion collisions, where a system of dense and hot partons has been created. In this context it is important and interesting as well to check how well the Monte Carlo generators can describe the properties or the behaviour of multiparticle production processes. One such possible behaviour is the self-similarity in the particle production, which can be studied with the intermittency studies and further with chaoticity/erraticity, in the heavy ion collisions. We analyse the behaviour of erraticity index in central Pb-Pb collisions at centre of mass energy of 2.76 TeV per nucleon using the AMPT monte carlo event generator, following the recent proposal by R.C. Hwa and C.B. Yang, concerning the local multiplicity fluctuation study as a signature of critical hadronization in heavy-ion collisions. We report the values of erraticity index for the two versions of the model with default settings and their dependence on the size of the phase space region. Results presented here may serve as a reference sample for the experimental data from heavy ion collisions at these energies. Comment: 12 pages, 10 Figures, WPCF-2014. arXiv admin note: substantial text overlap with arXiv:1411.0280
Identifier: 1501.03773 (ARXIV ID)
• Several versions

### Scaling Properties of Multiplicity Fluctuations in the AMPT Model

Sharma, Rohni, Gupta, Ramni
Advances in High Energy Physics, 2018, Vol.2018 [Peer Reviewed Journal]

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### A Monte Carlo Study of Multiplicity Fluctuations in Pb-Pb Collisions at LHC Energies

Gupta, Ramni
arXiv.org, Jan 15, 2015
© ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
Available
Title: A Monte Carlo Study of Multiplicity Fluctuations in Pb-Pb Collisions at LHC Energies
Author: Gupta, Ramni
Contributor: Gupta, Ramni (pacrepositoryorg)
Subject: Monte Carlo Simulation ; Partons ; Heavy Ions ; Particle Production ; Dependence ; Self-Similarity ; Computer Simulation ; Variation ; Ionic Collisions
Description: With large volumes of data available from LHC, it has become possible to study the multiplicity distributions for the various possible behaviours of the multiparticle production in collisions of relativistic heavy ion collisions, where a system of dense and hot partons has been created. In this context it is important and interesting as well to check how well the Monte Carlo generators can describe the properties or the behaviour of multiparticle production processes. One such possible behaviour is the self-similarity in the particle production, which can be studied with the intermittency studies and further with chaoticity/erraticity, in the heavy ion collisions. We analyse the behaviour of erraticity index in central Pb-Pb collisions at centre of mass energy of 2.76 TeV per nucleon using the AMPT monte carlo event generator, following the recent proposal by R.C. Hwa and C.B. Yang, concerning the local multiplicity fluctuation study as a signature of critical hadronization in heavy-ion...
Is part of: arXiv.org, Jan 15, 2015
Identifier: 2331-8422 (E-ISSN)
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### A Monte Carlo Study of Multiplicity Fluctuations in Pb-Pb Collisions at LHC Energies

Gupta, Ramni
AgEcon Search: Research in Agricultural and Applied Economics
Available
Title: A Monte Carlo Study of Multiplicity Fluctuations in Pb-Pb Collisions at LHC Energies
Author: Gupta, Ramni
Subject: Research and Development/Tech Change/Emerging Technologies
Description: With large volumes of data available from LHC, it has become possible to study the multiplicity distributions for the various possible behaviours of the multiparticle production in collisions of relativistic heavy ion collisions, where a system of dense and hot partons has been created. In this context it is important and interesting as well to check how well the Monte Carlo generators can describe the properties or the behaviour of multiparticle production processes. One such possible behaviour is the self-similarity in the particle production, which can be studied with the intermittency studies and further with chaoticity/erraticity, in the heavy ion collisions. We analyse the behaviour of erraticity index in central Pb-Pb collisions at centre of mass energy of 2.76 TeV per nucleon using the AMPT monte carlo event generator, following the recent proposal by R.C. Hwa and C.B. Yang, concerning the local multiplicity fluctuation study as a signature of critical hadronization in...
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### Evidence on the absence of critical transition in AMPT for Pb-Pb collisions at $$sqrt{s_{\rm{NN}}}$$ = 2.76 TeV

Gupta, Ramni, Sharma, Rohni
arXiv.org, Jan 28, 2015
© ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
Available
Title: Evidence on the absence of critical transition in AMPT for Pb-Pb collisions at $$sqrt{s_{\rm{NN}}}$$ = 2.76 TeV
Author: Gupta, Ramni; Sharma, Rohni
Contributor: Sharma, Rohni (pacrepositoryorg)
Subject: Charged Particles ; Scaling ; Collisions ; Intermittency ; Quark-Gluon Plasma ; Particle Production ; Variations ; Phase Transitions
Description: Event-by-event fluctuations in the spatial patterns in charged particles generated in Pb--Pb collisions at the center-of-mass energy $$\sqrt{S_{\rm{NN}}}$$ = 2.76 TeV are studied within A MultiPhase Transport (AMPT) model. The spatial patterns of the particles generated in the ($$\eta, \phi$$) space for $$|\eta| \le 0.8$$ are studied using the methodology of intermittency and erraticity analysis. We find negative intermittency for charged particles generated in a range of $$p_{\rm{T}}$$ windows. This result contrasts sharply from what is expected for a quark-gluon plasma undergoing hadronization by a second-order phase transition. Appropriate scaling behavior is examined, resulting in definitive scaling exponent $$\nu_{-}$$. Event-by-event fluctuations in the spatial patterns quantified by an index, named erraticity index are determined for different $$p_{\rm{T}}$$ bins $$\leq 1$$ GeV/c, for AMPT model. This is the first time that the intermittency and erraticity indices are determined...
Is part of: arXiv.org, Jan 28, 2015
Identifier: 2331-8422 (E-ISSN)
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### Scaling Properties of Multiplicity Fluctuations in the AMPT Model

Sharma, Rohni, Gupta, Ramni
arXiv.org, Oct 29, 2018
© ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
Available
Title: Scaling Properties of Multiplicity Fluctuations in the AMPT Model
Author: Sharma, Rohni; Gupta, Ramni
Contributor: Gupta, Ramni (pacrepositoryorg)
Subject: Phase Transitions ; Feature Extraction ; Scaling ; Transverse Momentum ; Charged Particles ; Phase Transitions ; Variation
Description: From the events generated from the MC code of a multi-phase transport (AMPT) model with string melting, the properties of multiplicity fluctuations of charged particles in Pb-Pb collisions at $$\sqrt{s_{\mathrm{NN}}}=\rm{~2.76 \,TeV}$$ are studied. Normalized factorial moments, $$F_{q}$$, of spatial distributions of the particles have been determined in the framework of intermittency. Those moments are found in some kinematic regions to exhibit scaling behavior at small bin sizes, but not in most regions. However, in relating $$F_{q}$$ to $$F_{2}$$ scaling behavior is found in nearly all regions. The corresponding scaling exponents, $$\nu$$, determined in the low transverse momentum ($$p_{\rm{T}}$$) region $$\le$$ 1.0 GeV/c are observed to be independent of the $$p_{\rm{T}}$$ bin position and width. The value of $$\nu$$ is found to be larger than 1.304, which is the value that characterizes the Ginzburg-Landau type second order phase transition. Thus there is no known signature for phase...
Is part of: arXiv.org, Oct 29, 2018
Identifier: 2331-8422 (E-ISSN)
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### Evidence on the absence of critical transition in AMPT for Pb-Pb collisions at $sqrt{s_{\rm{NN}}}$ = 2.76 TeV

Gupta, Ramni, Sharma, Rohni
Cornell University
Available
Title: Evidence on the absence of critical transition in AMPT for Pb-Pb collisions at $sqrt{s_{\rm{NN}}}$ = 2.76 TeV
Author: Gupta, Ramni; Sharma, Rohni
Subject: Nuclear Experiment ; High Energy Physics - Phenomenology ; Nuclear Theory
Description: Event-by-event fluctuations in the spatial patterns in charged particles generated in Pb--Pb collisions at the center-of-mass energy $\sqrt{S_{\rm{NN}}}$ = 2.76 TeV are studied within A MultiPhase Transport (AMPT) model. The spatial patterns of the particles generated in the ($\eta, \phi$) space for $|\eta| \le 0.8$ are studied using the methodology of intermittency and erraticity analysis. We find negative intermittency for charged particles generated in a range of $p_{\rm{T}}$ windows. This result contrasts sharply from what is expected for a quark-gluon plasma undergoing hadronization by a second-order phase transition. Appropriate scaling behavior is examined, resulting in definitive scaling exponent $\nu_{-}$. Event-by-event fluctuations in the spatial patterns quantified by an index, named erraticity index are determined for different $p_{\rm{T}}$ bins $\leq 1$ GeV/c, for AMPT model. This is the first time that the intermittency and erraticity indices are determined for any model at such high energies. The results presented here can be used for comparison with the fluctuation properties of the experimental data and hence can help the development of a wider scope of understanding of validity of the particle production process by AMPT at these energies on the one hand, and of the true nature of the real data on the other. Comment: 15 pages, 11 Figuers
Identifier: 1411.0280 (ARXIV ID)
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### Scaling Properties of Multiplicity Fluctuations in the AMPT Model

Sharma, Rohni, Gupta, Ramni
Cornell University
Available
Title: Scaling Properties of Multiplicity Fluctuations in the AMPT Model
Author: Sharma, Rohni; Gupta, Ramni
Subject: High Energy Physics - Phenomenology
Description: From the events generated from the MC code of a multi-phase transport (AMPT) model with string melting, the properties of multiplicity fluctuations of charged particles in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=\rm{~2.76 \,TeV}$ are studied. Normalized factorial moments, $F_{q}$, of spatial distributions of the particles have been determined in the framework of intermittency. Those moments are found in some kinematic regions to exhibit scaling behavior at small bin sizes, but not in most regions. However, in relating $F_{q}$ to $F_{2}$ scaling behavior is found in nearly all regions. The corresponding scaling exponents, $\nu$, determined in the low transverse momentum ($p_{\rm{T}}$) region $\le$ 1.0 GeV/c are observed to be independent of the $p_{\rm{T}}$ bin position and width. The value of $\nu$ is found to be larger than 1.304, which is the value that characterizes the Ginzburg-Landau type second order phase transition. Thus there is no known signature for phase transition in the AMPT model. This study demonstrates that, for the system under investigation, the method of analysis is effective in extracting features that are relevant to the question of whether the dynamical processes leading phase transition are there or not. Comment: 6 pages, 5 figures
Identifier: 1806.10854 (ARXIV ID)
• Several versions

### Intermittency Study of Charged Particles Generated in Pb-Pb Collisions at sNN=2.76 TeV Using EPOS3

Gupta, Ramni, Sarkisyan-Grinbaum, Edward
Advances in High Energy Physics, 2020, Vol.2020 [Peer Reviewed Journal]

• Several versions

### Corrigendum to “Intermittency Study of Charged Particles Generated in Pb-Pb Collisions at sNN=2.76 TeV Using EPOS3”

Gupta, Ramni
Advances in High Energy Physics, 2020, Vol.2020 [Peer Reviewed Journal]