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heavy flavor dissociation in framework of multi-body Dirac equations

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Chinese Physics C 2020年第8期44卷 115-124页

作者：施舒哲赵佳星庄鹏飞 Physics Department Tsinghua UniversityBeijing 100084China Department of Physics McGill UniversityMontrealQC H3A 2T8Canada

We study heavy flavor properties at finite temperature in the framework of a relativistic potential *** an improved method to solve the three-body Dirac equation,we determine a universal set of model parameters for both mesons and baryons by fitting heavy flavor masses in *** heavy quark potential from lattice QCD simulations in hot medium,we systematically calculate heavy flavor binding energies and averaged sizes as functions of the *** meson and baryons are separately sequentially dissociated in the quark-gluon plasma,and the mesons can survive at higher temperatures owing to the stronger potential between quark-antiquark pairs than that between quark-quark pairs.

关键词： heavy flavor hadron dissociation relativistic heavy-ion collision heavy flavor baryon

Study of compound particle production in ^(84)Kr-emulsion interactions at 1.7 A GeV

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Chinese Physics C 2011年第4期35卷 349-354页

作者：白彩艳张东海 Department of Physics Jinzhong College Institute of Modern Physics Shanxi Normal University

The characteristics of compound particle multiplicity distribution and multiplicity correlations between the compound particle and the grey particle, black particle, shower particle and heavily ionized track particle are investigated in this paper. It is found that the average multiplicities of the grey particle, black particle, shower particle and heavily ionized track particle increase with an increase in the number of compound particles, which can be explained by the impact geometrical model. The compound multiplicity distribution is observed to obey a Koba-Nielson-Olesen （KNO） type of scaling law.

关键词： relativistic heavy-ion collision compound particle nuclear emulsion

Projectile spectator proton production in ^(84)Kr-emulsion interactions at 1.7 A GeV

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Chinese Physics C 2011年第5期35卷 436-440页

作者：白彩艳张东海 Department of Physics Jinzhong College Institute of Modern Physics Shanxi Normal University

The multiplicity distribution of projectile protons and multiplicity correlations between black particles, grey particles, shower particles, compound particles, heavily ionized track particles, projectile helium fragments and projectile spectator protons in 84Kr-emulsion collisions at 1.7 A GeV are investigated. It is found that the projectile spectator proton multiplicity distribution becomes broader with increasing target mass. The average multiplicity of shower particles and compound particles strongly depends on the number of projectile spectator protons, but the average multiplicity of black particles, grey particles and heavily ionized track particles weakly depends on the number of projectile spectator protons. The average multiplicity of projectile helium fragments increases linearly with increasing numbers of projectile spectator protons. Finally, the multiplicity distribution of projectile spectator protons obeys a KNO type of scaling law.

关键词： relativistic heavy-ion collision projectile spectator proton nuclear emulsion

Investigation of self-affine multiplicity fluctuations of proton emission in ^(84)Kr-AgBr interactions at 1.7 AGeV

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Chinese Physics C 2009年第5期33卷 345-349页

作者：张东海李惠玲 Institute of Modern Physics Shanxi Normal University

Self-affine multiplicity scaling is investigated in the framework of a two-dimensional factorial moment methodology using the concept of the Hurst exponent （H）. Investigation of the experimental data of medium-energy knocked-out target protons in ^84Kr-AgBr interactions at 1.7 AGeV reveals that the best power law behavior is exhibited for H=0.4, indicating a self-affine multiplicity fluctuation pattern. Multifractality among the knocked-out target protons is also observed in the data.

关键词： relativistic heavy-ion collision knocked-out target protons nuclear emulsion

Fast heating dissociation of Υ(1S) in heavy ion collisions at RHIC

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Chinese Physics C 2020年第12期44卷 158-162页

作者：刘云朋陈保义 Department of Applied Physics School of ScienceTianjin UniversityTianjin 300072China

By adopting the adiabatic assumption in the cooling process,we discuss a novel mechanism ofΥ(1S)suppression that occurs due to the fast heating process at the early stage of the fireball,instead of its finite decay width in a finite temperature medium generated by heavy ion *** calculate the transition probability after the fast heating dissociation as a function of the temperature of the medium and the nuclear modification factor in central collisions and find that the suppression is not negligible at RHIC,even if the width ofΥ(1S)becomes zero.

关键词： relativistic heavy-ion collision quark-gluon plasma heavy quarkonium adiabatic theorem

Fragmentation in ^16 O-emulsion interactions at 3.7 A GeV

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Chinese Physics B 2005年第12期14卷 2451-2457页

作者：张东海李振宇刘惠玲李俊生 Institute of Modern Physics Shanxi Normal University Linfen 041004 China

The topology of ^16 O fragmentation at 3.7 A GeV in reactions with emulsion nuclei is presented. The multiplicity distributions of projectile fragments, charged secondaries and their dependences on the projectile resi... 详细信息

关键词： relativistic heavy-ion collision projectile fragmentation nuclear emulsion

Evidence of intermittent fluctuation of target fragments in ^84Kr-AgBr interactions at 1.7 A GeV

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Chinese Physics B 2007年第9期16卷 2683-2688页

作者：张东海李雪琴贾会明何春乐刘芳赵惠华李振宇李俊生 Institute of Modern Physics Shanxi Normal University Linfen 041004 China

Intermittency and fractal behaviour have been studied of emission spectra of target associated fragments from ^84Kr-AgBr interactions at 1.7 A GeV in emission angle space and azimuthal angle space separately. The intermittent behaviour is observed in the two spaces separately. Prom the intermittency exponent, the anomalous fractal dimension dq is calculated and the variation of dq with the order q is investigated. It is found that the anomalous dimensions are found to increase with the order of moments q, thereby indicating the relation of multifractality to production mechanism of target associated fragments.

关键词： relativistic heavy-ion collision intermittency nuclear emulsion

Forward-backward multiplicity correlations 4.5 A GeV/c ^16O-emulsion interactions

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Chinese Physics B 2006年第9期15卷 1987-1995页

作者：张东海赵惠华刘芳何春乐贾会明李雷琴李振宇李俊生 Institute of Modern Physics Shanxi Teachers' University Linfen 041004 China

A detailed study of the mechanisms of the emissions of pions and protons in the forward and backward hemispheres in 4.5 A GeV/c oxygen-emulsion interactions has been carried out. The correlations between the multiplic... 详细信息

关键词： relativistic heavy-ion collision backward-forward correlation nuclear emulsion

Features of the total disintegration events of heavy emulsion targets caused by 4.5 A GeV/c ^16O

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Chinese Physics B 2006年第11期15卷 2564-2570页

作者：张东海刘芳何春乐赵惠华贾会明李雪琴李振宇李俊生 Institute of Modern Physics Shanxi Normal University Linfen 041004 China

Total disintegration events produced by 4.5 A GeV/c ^16O-AgBr interactions are analysed to investigate the characteristics of secondary charged particles produced in such collisions. The multiplicity distributions of grey, black, and relativistic charged particles can be well represented by Gaussian distribution. The average multiplicity of grey particles is found to increase with the mass of projectile increasing, while that of black particles is found to decrease with the mass of projectile increasing. This result is in good agreement with the prediction of fireball model. Finally, the linear dependence between grey and black particles is observed, but there is no distinct dependence between the production of relativistic charged particles and the target excitation.

关键词： relativistic heavy-ion collision total disintegration nuclear emulsion