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Electromagnetic fields in ultra-peripheral relativistic heavy-ion collisions 被引量:1
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作者 Jie Zhao Jin-Hui Chen +1 位作者 Xu-Guang Huang Yu-Gang Ma 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第2期103-109,共7页
Ultra-peripheral heavy-ion collisions(UPCs)offer unique opportunities to study processes under strong electromagnetic fields.In these collisions,highly charged fast-moving ions carry strong electromagnetic fields that... Ultra-peripheral heavy-ion collisions(UPCs)offer unique opportunities to study processes under strong electromagnetic fields.In these collisions,highly charged fast-moving ions carry strong electromagnetic fields that can be effectively treated as photon fluxes.The exchange of photons can induce photonuclear and two-photon interactions and excite ions.This excitation of the ions results in Coulomb dissociation with the emission of photons,neutrons,and other particles.Additionally,the electromagnetic fields generated by the ions can be sufficiently strong to enforce mutual interactions between the two colliding ions.Consequently,the two colliding ions experience an electromagnetic force that pushes them in opposite directions,causing a back-to-back correlation in the emitted neutrons.Using a Monte Carlo simulation,we qualitatively demonstrate that the above electromagnetic effect is large enough to be observed in UPCs,which would provide a clear means to study strong electromagnetic fields and their effects. 展开更多
关键词 Electromagnetic fields Neutrons Ultra-peripheral relativistic heavy-ion collisions(UPC)
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Properties of collective flow and pion production in intermediate-energy heavy-ion collisions with a relativistic quantum molecular dynamics model
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作者 Si-Na Wei Zhao-Qing Feng 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第1期155-169,共15页
The relativistic mean-field approach was implemented in the Lanzhou quantum molecular dynamics transport model(LQMD.RMF). Using the LQMD.RMF, the properties of collective flow and pion production were investigated sys... The relativistic mean-field approach was implemented in the Lanzhou quantum molecular dynamics transport model(LQMD.RMF). Using the LQMD.RMF, the properties of collective flow and pion production were investigated systematically for nuclear reactions with various isospin asymmetries. The directed and elliptic flows of the LQMD.RMF are able to describe the experimental data of STAR Collaboration. The directed flow difference between free neutrons and protons was associated with the stiffness of the symmetry energy, that is, a softer symmetry energy led to a larger flow difference. For various collision energies, the ratio between the π^(-) and π^(+) yields increased with a decrease in the slope parameter of the symmetry energy. When the collision energy was 270 MeV/nucleon, the single ratio of the pion transverse momentum spectra also increased with decreasing slope parameter of the symmetry energy in both nearly symmetric and neutron-rich systems.However, it is difficult to constrain the stiffness of the symmetry energy with the double ratio because of the lack of threshold energy correction on the pion production. 展开更多
关键词 heavy-ion collision Collective flow Pion production Symmetry energy Relativistic mean field
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The study of intelligent algorithm in particle identification of heavy-ion collisions at low and intermediate energies
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作者 Gao-Yi Cheng Qian-Min Su +1 位作者 Xi-Guang Cao Guo-Qiang Zhang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第2期170-182,共13页
Traditional particle identification methods face timeconsuming,experience-dependent,and poor repeatability challenges in heavy-ion collisions at low and intermediate energies.Researchers urgently need solutions to the... Traditional particle identification methods face timeconsuming,experience-dependent,and poor repeatability challenges in heavy-ion collisions at low and intermediate energies.Researchers urgently need solutions to the dilemma of traditional particle identification methods.This study explores the possibility of applying intelligent learning algorithms to the particle identification of heavy-ion collisions at low and intermediate energies.Multiple intelligent algorithms,including XgBoost and TabNet,were selected to test datasets from the neutron ion multi-detector for reaction-oriented dynamics(NIMROD-ISiS)and Geant4 simulation.Tree-based machine learning algorithms and deep learning algorithms e.g.TabNet show excellent performance and generalization ability.Adding additional data features besides energy deposition can improve the algorithm’s performance when the data distribution is nonuniform.Intelligent learning algorithms can be applied to solve the particle identification problem in heavy-ion collisions at low and intermediate energies. 展开更多
关键词 heavy-ion collisions at low and intermediate energies Machine learning Ensemble learning algorithm Particle identification Data imbalance
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Transverse momentum balance of dijets in Xe+Xe collisions at the LHC
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作者 Yao Li Shu-Wan Shen +1 位作者 Sa Wang Ben-Wei Zhang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第7期137-146,共10页
We present a theoretical study of the medium modifications of the p_(T)balance (x_(J)) of dijets in Xe+Xe collisions at■.The initial production of dijets was carried out using the POWHEG+PYTHIA8 prescription,which ma... We present a theoretical study of the medium modifications of the p_(T)balance (x_(J)) of dijets in Xe+Xe collisions at■.The initial production of dijets was carried out using the POWHEG+PYTHIA8 prescription,which matches the next-toleading-order (NLO) QCD matrix elements with the parton shower (PS) effect.The SHELL model described the in-medium evolution of nucleus–nucleus collisions using a transport approach.The theoretical results of the dijet xJin the Xe+Xe collisions exhibit more imbalanced distributions than those in the p+p collisions,consistent with recently reported ATLAS data.By utilizing the Interleaved Flavor Neutralisation,an infrared-and-collinear-safe jet flavor algorithm,to identify the flavor of the reconstructed jets,we classify dijets processes into three categories:gluon–gluon (gg),quark–gluon (qg),and quark–quark (qq),and investigated the respective medium modification patterns and fraction changes of the gg,qg,and qq components of the dijet sample in Xe+Xe collisions.It is shown that the increased fraction of qg component at a small x_(J)contributes to the imbalance of the dijet;in particular,the q_(1)g_(2)(quark-jet-leading) dijets experience more significant asymmetric energy loss than the g_(1)q_(2)(gluon-jet-leading) dijets traversing the QGP.By comparing the■of inclusive,■ dijets in Xe+Xe collisions,we observe■.Moreover,ρ_(Xe),P_(b),the ratios of the nuclear modification factors of dijets in Xe+Xe to those in Pb+Pb,were calculated,which indicates that the yield suppression of dijets in Pb+Pb is more pronounced than that in Xe+Xe owing to the larger radius of the lead nucleus. 展开更多
关键词 heavy-ion collisions Quark-gluon plasma Jet quenching Transverse momentum balance
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Effects of sequential decay on collective flows and nuclear stopping power in heavy-ion collisions at intermediate energies 被引量:1
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作者 Kui Xiao Peng-Cheng Li +2 位作者 Yong-Jia Wang Fu-Hu Liu Qing-Feng Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第4期175-184,共10页
In this study, the rapidity distribution, collective flows, and nuclear stopping power in ^(197)Au+^(197)Au collisions at intermediate energies were investigated using the ultrarelativistic quantum molecular dynamics(... In this study, the rapidity distribution, collective flows, and nuclear stopping power in ^(197)Au+^(197)Au collisions at intermediate energies were investigated using the ultrarelativistic quantum molecular dynamics(UrQMD) model with GEMINI++ code. The UrQMD model was adopted to simulate the dynamic evolution of heavy-ion collisions, whereas the GEMINI++ code was used to simulate the decay of primary fragments produced by UrQMD. The calculated results were compared with the INDRA and FOPI experimental data. It was found that the rapidity distribution, collective flows, and nuclear stopping power were affected to a certain extent by the decay of primary fragments, especially at lower beam energies. Furthermore, the experimental data of the collective flows and nuclear stopping power at the investigated beam energies were better reproduced when the sequential decay effect was included. 展开更多
关键词 heavy-ion collisions Sequential decay effect Collective flow Nuclear stopping power
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Thermodynamic properties at the kinetic freeze-out in the Au + Au and Cu + Cu collisions at the RHIC using the Tsallis distribution
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作者 Wei-Hao Wu Jun-Qi Tao +4 位作者 Hua Zheng Wen-Chao Zhang Xing-Quan Liu Li-Lin Zhu Aldo Bonasera 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第10期73-82,共10页
The thermodynamic properties of charged particles,such as the energy density,pressure,entropy density,particle density,and squared speed of sound at the kinetic freeze-out in the Au+Au collisions from the relativistic... The thermodynamic properties of charged particles,such as the energy density,pressure,entropy density,particle density,and squared speed of sound at the kinetic freeze-out in the Au+Au collisions from the relativistic heavy ion collider (RHIC)beam energy scan program √S_(NN) and in the Cu+Cu collisions at √S_(NN),200 GeV are studied using the thermodynamically consistent Tsallis distribution.The energy density,pressure,and particle density decrease monotonically with the collision energy for the same collision centrality;These properties also decrease monotonically from the central to peripheral collisions at the same collision energy.While the scaled energy densityε∕T^(4) and scaled entropy density s∕T^(3) demonstrate the opposite trend with the collision energy for the same collision centrality.There is a correlation betweenε∕T^(4) and s∕T^(3) at the same centrality.In addition,the squared speed of sound was calculated to determine that all the collision energies share nearly the same value at different collision centralities. 展开更多
关键词 heavy-ion collision Tsallis distribution Kinetic freeze-out Energy density Entropy density Particle density Squared speed of sound Pressure
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Novel quantum phenomena induced by strong magnetic fields in heavy-ion collisions 被引量:13
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作者 Koichi Hattori Xu-Guang Huang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2017年第2期70-98,共29页
The relativistic heavy-ion collisions create both hot quark–gluon matter and strong magnetic fields, and provide an arena to study the interplay between quantum chromodynamics and quantum electrodynamics. In recent y... The relativistic heavy-ion collisions create both hot quark–gluon matter and strong magnetic fields, and provide an arena to study the interplay between quantum chromodynamics and quantum electrodynamics. In recent years, it has been shown that such an interplay can generate a number of interesting quantum phenomena in hadronic and quark–gluon matter. In this short review, we first discuss some properties of the magnetic fields in heavy-ion collisions and then give an overview of the magnetic fieldinduced novel quantum effects. In particular, we focus on the magnetic effect on the heavy flavor mesons, the heavyquark transports, and the phenomena closely related to chiral anomaly. 展开更多
关键词 RELATIVISTIC heavy-ion collisions Strong magnetic fields Anomalous TRANSPORTS QUARKONIUM Heavy QUARK diffusion dynamics
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Recent development of hydrodynamic modeling in heavy-ion collisions 被引量:10
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作者 Chun Shen Li Yan 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2020年第12期88-121,共34页
We present a concise review of the recent development of relativistic hydrodynamics and its applications to heavy-ion collisions.Theoretical progress on the extended formulation of hydrodynamics toward out-ofequilibri... We present a concise review of the recent development of relativistic hydrodynamics and its applications to heavy-ion collisions.Theoretical progress on the extended formulation of hydrodynamics toward out-ofequilibrium systems is addressed,with emphasis on the socalled attractor solution.Moreover,recent phenomenological improvements in the hydrodynamic modeling of heavy-ion collisions with respect to the ongoing beam energy scan program,the quantitative characterization of transport coefficients in three-dimensionally expanding quark–gluon plasma,the fluid description of small colliding systems,and certain other interdisciplinary connections are discussed. 展开更多
关键词 heavy-ion collisions HYDRODYNAMICS QCD
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Anomalous chiral transports and spin polarization in heavy-ion collisions 被引量:8
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作者 Yu-Chen Liu Xu-Guang Huang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第6期30-51,共22页
Relativistic heavy-ion collisions create hot quark–gluon plasma as well as very strong electromagnetic(EM)and fluid vortical fields.The strong EM field and vorticity can induce intriguing macroscopic quantum phenomen... Relativistic heavy-ion collisions create hot quark–gluon plasma as well as very strong electromagnetic(EM)and fluid vortical fields.The strong EM field and vorticity can induce intriguing macroscopic quantum phenomena such as chiral magnetic,chiral separation,chiral electric separation,and chiral vortical effects as well as the spin polarization of hadrons.These phenomena provide us with experimentally feasible means to study the nontrivial topological sector of quantum chromodynamics,the possible parity violation of strong interaction at high temperature,and the subatomic spintronics of quark–gluon plasma.These studies,both in theory and in experiments,are strongly connected with other subfields of physics such as condensed matter physics,astrophysics,and cold atomic physics,and thus form an emerging interdisciplinary research area.We give an introduction to the aforementioned phenomena induced by the EM field and vorticity and an overview of the current status of experimental research in heavy-ion collisions.We also briefly discuss spin hydrodynamics as well as chiral and spin kinetic theories. 展开更多
关键词 heavy-ion collision Chiral magnetic effect Spin polarization Quark–gluon plasma
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Recent developments in chiral and spin polarization effects in heavy-ion collisions 被引量:6
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作者 Jian-Hua Gao Guo-Liang Ma +1 位作者 Shi Pu Qun Wang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第9期53-74,共22页
We give a brief overview of recent theoretical and experimental results on the chiral magnetic effect and spin polarization effect in heavy-ion collisions.We present updated experimental results for the chiral magneti... We give a brief overview of recent theoretical and experimental results on the chiral magnetic effect and spin polarization effect in heavy-ion collisions.We present updated experimental results for the chiral magnetic effect and related phenomena.The time evolution of the magnetic fields in different models is discussed.The newly developed quantum kinetic theory for massive fermions is reviewed.We present theoretical and experimental results for the polarization of K hyperons and the q00 value of vector mesons. 展开更多
关键词 Relativistic heavy-ion collisions Chiral magnetic effect Chiral kinetic theory Spin polarization
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Pseudo-rapidity distributions of charged particles in asymmetric collisions using Tsallis thermodynamics
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作者 Jun‑Qi Tao Hong‑Bin He +4 位作者 Hua Zheng Wen‑Chao Zhang Xing‑Quan Liu Li‑Lin Zhu Aldo Bonasera 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第11期120-127,共8页
The pseudo-rapidity distributions of the charged particles produced in the asymmetric collision systems p+Al,p+Au and ^(3)He+Au at√S_(NN)=200 GeV GeV are evaluated in the framework of a fireball model with Tsallis th... The pseudo-rapidity distributions of the charged particles produced in the asymmetric collision systems p+Al,p+Au and ^(3)He+Au at√S_(NN)=200 GeV GeV are evaluated in the framework of a fireball model with Tsallis thermodynamics.The fireball model assumes that the experimentally measured particles are produced by fireballs following the Tsallis distribution and it can effectively describe the experimental data.Our results as well as previous results for d+Au collisions at√S_(NN)=200 GeV GeV and p+Pb collisions at√S_(NN)=5.02 TeV TeV validate that the fireball model based on Tsallis thermodynamics can provide a universal framework for pseudo-rapidity distribution of the charged particles produced in asymmetric collision systems.We predict the centrality dependence of the total charged particle multiplicity in the p+Al,p+Au and 3He+Au collisions.Additionally,the dependences of the fireball model parameters(y_(0a),y_(0A),σ_(a) and σ_(A))on the centrality and system size are studied. 展开更多
关键词 Tsallis thermodynamics Fireball model Pseudo-rapidity distribution heavy-ion collisions Charged particles
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Effect of relaxation time on the squeezed correlations of bosons for evolving sources in relativistic heavy-ion collisions 被引量:1
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作者 Wei-Ning Zhang Peng-Zhi Xu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第2期87-92,共6页
The squeezed back-to-back correlation(SBBC)of a boson-antiboson pair is sensitive to the time distribution of the particle-emitting source,and the SBBC function for an evolving source is expected to be affected by the... The squeezed back-to-back correlation(SBBC)of a boson-antiboson pair is sensitive to the time distribution of the particle-emitting source,and the SBBC function for an evolving source is expected to be affected by the relaxation time of the system.In this study,we investigated the effect of relaxation time on the SBBC function.We propose a method for calculating the SBBC function with relaxation-time approximation for evolving sources.SBBC functions of D^(0)D^(-0)in relativistic heavy-ion collisions were investigated using a hydrodynamic model.We found that the relaxation time reduces the amplitudes of the SBBC functions.This becomes apparent for long relaxation times and large initial relative deviations of the chaotic and squeezed amplitudes from their equilibrium values in the temporal steps. 展开更多
关键词 Relaxation time Squeezed back-to-back correlation Evolving source Relativistic heavy-ion collisions
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Squeezed Back-to-Back Correlation of D^0~0 in Relativistic Heavy-Ion Collisions 被引量:1
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作者 Ai-Geng Yang Yong Zhang +2 位作者 Luan Cheng Hao Sun Wei-Ning Zhang 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第5期25-28,共4页
We investigate the squeezed back-to-back correlation(BBC) of D^0~0 in relativistic heavy-ion collisions, using the in-medium mass modification calculated with a self-energy in hot pion gas and the source space-time ... We investigate the squeezed back-to-back correlation(BBC) of D^0~0 in relativistic heavy-ion collisions, using the in-medium mass modification calculated with a self-energy in hot pion gas and the source space-time distributions provided by the viscous hydrodynamic code VISH2+1. It is found that the squeezed BBC of D^0~0 is significant in peripheral Au+Au collisions at the relativistic heavy ion collider energy. A possible way to detect the squeezed BBC in an experiment is presented. 展开更多
关键词 in Relativistic heavy-ion collisions BBC Squeezed Back-to-Back Correlation of D~0
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An Explanation of a Phenomenon in Relativistic Heavy-Ion Collisions
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作者 陈小凡 杨学栋 +2 位作者 陈志来 孙芳魁 苏润洲 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第4期640-642,共3页
The multi-source pion interferometry in relativistic heavy-ion collisions is presented and two-source models for hadron gas and hadron gas plus quark-gluon plasma are proposed. The models can resolve the HBT puzzle. F... The multi-source pion interferometry in relativistic heavy-ion collisions is presented and two-source models for hadron gas and hadron gas plus quark-gluon plasma are proposed. The models can resolve the HBT puzzle. For the same q and different direction of q, the two-pion correlation functions show characteristic oscillation behaviors, which may be used to distinguish the two-source models. Our research also showes that the multi-source pion correlations can resolve the HBT puzzle. 展开更多
关键词 multi-source pion interferometry HBT puzzle relativistic heavy-ion collisions
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Unified Hydrodynamics and Pseudorapidity Distributions of Charged Particles Produced in Heavy Ion Collisions at Low Energies at RHIC
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作者 姜志进 惠加琪 邓海平 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第5期36-39,共4页
In the context of unified hydrodynamics, we discuss the pseudorapidity distributions of the charged particles produced in Au-Au and Cu-Cu collisions at the low RHIC energies of √SNN = 19.6 and 22.4 GeV, respectively.... In the context of unified hydrodynamics, we discuss the pseudorapidity distributions of the charged particles produced in Au-Au and Cu-Cu collisions at the low RHIC energies of √SNN = 19.6 and 22.4 GeV, respectively. It is found that the unified hydrodynamics alone can give a good description to the experimental measurements. This is different from the collisions at the maximum RHIC energy of √SNN = 200 GeV or at LHC energy of √SNN= 2.76 TeV, in which the leading particles must be taken into account so that we can properly explain the experimental observations. 展开更多
关键词 Unified Hydrodynamics and Pseudorapidity Distributions of Charged Particles Produced in Heavy Ion collisions at Low Energies at rhic SNN LHC
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Charge Fluctuations in <i>pp</i>and <i>AA</i>Collisions at RHIC and LHC Energies
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作者 Shakeel Ahmad M. Zafar +1 位作者 M. Irfan A. Ahmad 《World Journal of Nuclear Science and Technology》 2012年第4期200-205,共6页
Various measures of event-by-event net charge and charge ratio fluctuations in pp and AA collisions at RHIC and LHC energies are studied using the different Monte Carlo generators: URQMD, HIJING and HIJING/ and the re... Various measures of event-by-event net charge and charge ratio fluctuations in pp and AA collisions at RHIC and LHC energies are studied using the different Monte Carlo generators: URQMD, HIJING and HIJING/ and the results are compared with the predictions for the independent emission, hadron gas and QGP phase. Values of the D-measures are observed to exhibit significant energy dependence for both pp and AA data. Furthermore, there is essentially no significant difference in the values of the D-measures predicted by the various Monte Carlo codes used in the present study. A slight centrality dependence of the D-measures in terms of net charge fluctuations is observed in the case of Au-Au data at 200A GeV/c. These findings, thus, suggest that a difference in the D-measures for pp and AA collisions either the re-scattering effect plays a predominant role or there might be some new physics present in these collisions. 展开更多
关键词 Hadron-Hadron collisions heavy-ion collisions Charge Fluctuations
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2-16 Symmetry Energy Extraction and Emitting Source Properties in Intermediate Heavy-ion Collisions
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作者 Liu Xingquan Wada Ryoichi +1 位作者 Lin Weiping Wang Jiansong 《IMP & HIRFL Annual Report》 2015年第1期70-72,共3页
In Eq. (1), A?? and Nln(N/A)+Zln(Z/A) originate from the increases of the entropy and the mixing entropy at the time of the fragment formation, respectively. n (p) is the neutron (proton) chemical potential.  is t... In Eq. (1), A?? and Nln(N/A)+Zln(Z/A) originate from the increases of the entropy and the mixing entropy at the time of the fragment formation, respectively. n (p) is the neutron (proton) chemical potential.  is the critical exponent. In this work, the value of =2.3 is adopted from the previous studies[1]. In general coefficients, av, as, asym, ac, ap and the chemical potentials are temperature and density dependent. 展开更多
关键词 INTERMEDIATE heavy-ion collisions
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Further developments of a multi-phase transport model for relativistic nuclear collisions 被引量:13
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作者 Zi-Wei Lin Liang Zheng 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2021年第10期110-142,共33页
A multi-phase transport(AMPT)model was constructed as a self-contained kinetic theory-based description of relativistic nuclear collisions as it contains four main components:the fluctuating initial condition,a parton... A multi-phase transport(AMPT)model was constructed as a self-contained kinetic theory-based description of relativistic nuclear collisions as it contains four main components:the fluctuating initial condition,a parton cascade,hadronization,and a hadron cascade.Here,we review the main developments after the first public release of the AMPT source code in 2004 and the corre-sponding publication that described the physics details of the model at that time.We also discuss possible directions for future developments of the AMPT model to better study the properties of the dense matter created in relativistic collisions of small or large systems. 展开更多
关键词 QGP Transport model heavy-ion collisions
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Anisotropy flows in Pb-Pb collisions at LHC energies from parton scatterings with heavy quark trigger 被引量:6
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作者 Hai Wang Jin-Hui Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第2期14-20,共7页
By implementing an additional heavy quark-antiquark pair production trigger in a multiphase transport(AMPT)model,we study the effect on anisotropy flows of identified particles with a focus on charged particles and qu... By implementing an additional heavy quark-antiquark pair production trigger in a multiphase transport(AMPT)model,we study the effect on anisotropy flows of identified particles with a focus on charged particles and quarkonium(J/ΨandΥ).A systematic increase in the collision rate for active partons in the AMPT model with such an implementation has been observed.It leads to a slight increase of identified particles anisotropy flows as a function of transverse momentum(pT)and rapidity,and gives a better description of the experimental data of elliptic flow toward larger pT.Our approach provides an efficient way to study the heavy quark dynamics in the AMPT model at LHC energies. 展开更多
关键词 heavy-ion collision Quark-gluon plasma QUARKONIUM Collective flow
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Study on open charm hadron production and angular correlation in high-energy nuclear collisions 被引量:7
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作者 Hai Wang Jin-Hui Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2021年第1期10-16,共7页
We study the production and angular correlationof charm hadrons in hot and dense matter produced in high-energy nuclear-nuclear collisions within a multiphasetransport model(AMPT).By triggering additional charm-antich... We study the production and angular correlationof charm hadrons in hot and dense matter produced in high-energy nuclear-nuclear collisions within a multiphasetransport model(AMPT).By triggering additional charm-anticharm quark pair production in the AMPT,the modeldescribes the D^0 nuclear modification factor in the low andintermediate pr regions in Au+Au collisions at√VSNN=200 GeV reasonably well.Further exploration of the D^0 pair azimuthal angular correlation for different centralitiesshows clear evolution from low-multiplicity to high-mul-tiplicity events,which is associated with the number ofcharm quark interactions with medium partons duringAMPT transport. 展开更多
关键词 heavy-ion collision Heavy flavor Nuclear modification factor Two-particle correlations
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