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Impact of Vector-Current Interactions on the qcd phase diagram

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Journal of Modern Physics 2013年第5期4卷 644-650页

作者： Thomas Hell Kouji Kashiwa Wolfram Weise Physik Department Technische Universitat MünchenGarchingGermany ECT* Strada delle Tabarelle 286VillazzanoTrentoItaly RIKEN/BNL Research Center Brookhaven National LaboratoryUptonUSA

Using a nonlocal version of the Polyakov-loop-extended Nambu-Jona-Lasinio model, we investigate effects of a nonderivative vector-current interaction (relating to the quark-number density) at both real and imaginary chemical potentials. This repulsive vector interaction between quarks has the following impact on the chiral first-order phase transition: at imaginary chemical potential it sharpens the transition at the Roberge-Weiss (RW) end point and moves this critical point toward lower temperatures;at real chemical potential, the critical end point moves on a trajectory towards larger chemical potentials and lower temperatures with increasing vector coupling strength. The conditions are discussed at which the first-order phase transition disappears and turns into a smooth crossover.

关键词： qcd phase diagram PNJL Model

Nonextensive effects on qcd chiral phase diagram and baryon-number fluctuations within Polyakov-Nambu-Jona-Lasinio model

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Chinese Physics C 2023年第5期47卷 66-72页

作者：赵亚鹏王朝勇左淑毓李程明 School of Mathematics and Physics Henan University of Urban ConstructionPingdingshan 467036China Henan Provincial Engineering Laboratory of Building-Photovoltaics Pingdingshan 467036China College of Science Henan University of TechnologyZhengzhou 450000China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China

In this paper,a version of the Polyakov-Nambu-Jona-Lasinio(PNJL)model based on nonextensive statistical mechanics is *** new statistics summarizes all possible factors that violate the assumptions of the Boltzmann-Gibbs(BG)statistics to a dimensionless nonextensivity parameter ***,when q tends to 1,it returns to the BG *** the nonextensive PNJL model,we found that as q increases,the location of the critical end point(CEP)exhibits non-monotonic *** is,for q1.15,CEP turns to move in the direction of lower temperature and lower quark chemical *** addition,we studied the moments of the net-baryon number distribution,that is,variance(σ^(2)),skewness(S),and kurtosis(k).Our results are generally consistent with the latest experimental data reported,especially for√SNN>19.6 GeV,when q is set to 1.07.

关键词： nonextensive statistics Polyakov-Nambu-Jona-Lasinio model qcd phase diagram baryonnumber fluctuations

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Anisotropic flow in high baryon density region

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Nuclear Science and Techniques 2022年第2期33卷 79-86页

作者： Shao-Wei Lan Shu-Su Shi Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China

Collective flow is a powerful tool used to analyze the properties of a medium created during high-energy nuclear ***,we report a systematic study of the first two Fourier coefficients v_(1)and v_(2)of the proton andπ^(+)from Au+Au collisions in the energy range√sNN=2.11-4.9 GeV within the framework of a hadronic transport model(UrQMD).Recent results from the STAR experiment were used to test the model calculations.A meanfield mode with strong repulsive interaction is needed to reproduce the 10-40%data at 3 *** implies that hadronic interactions play an important role in the collective flow development in the high baryon density *** mean values of the freeze-out time for protons andπ^(+)are shifted earlier owing to the additional repulsive *** predict the energy dependence of the mean values of the transverse momentum,v_(1),and v_(2)for both protons andπ^(+)from the Au+Au collisions.

关键词： Heavy-ion collisions qcd phase diagram UrQMD Collective flow Mean-field potential

Properties of the phase diagram from the Nambu-Jona-Lasino model with a scalar-vector interaction

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Nuclear Science and Techniques 2024年第10期35卷 168-179页

作者： Yong-Hang Yang He Liu Peng-Cheng Chu Science School Qingdao University of TechnologyQingdao 266520China The Research Center of Theoretical Physics Qingdao University of TechnologyQingdao 266033China

We investigated the properties of the phase diagram of high-order susceptibilities,speed of sound,and polytropic index based on an extended Nambu-Jona-Lasinio model with an eight-quark scalar-vector ***-monotonic behavior was observed in all these quantities around the phase transition boundary,which also revealed the properties of the critical ***,this study indicated that the chiral phase transition boundary and critical point could vary depending on the scalarvector coupling constant G_(SV).At finite densities and temperatures,the negative G_(SV)term exhibited attractive interactions,which enhanced the critical point temperature and reduced the chemical *** G_(SV)term also affected the properties of the high-order susceptibilities,speed of sound,and polytropic index near the critical *** non-monotonic(peak or dip)structures of these quantities shifted to a low baryon chemical potential(and high temperature)with a negative G_(SV).G_(SV)also changed the amplitude and range of the nonmonotonic ***,the scalar-vector interaction was useful for locating the phase boundary and critical point in qcd phase diagram by comparing the experimental *** study of the non-monotonic behavior of high-order susceptibilities,speed of sound,and polytropic index is of great interest,and further observations related to high-order susceptibilities,speed of sound,and polytropic index being found and applied to the search for critical points in heavy-ion collisions and the study of compact stars are eagerly awaited.

关键词： qcd phase diagram High-order susceptibilities Speed of sound Polytropic index NJL model

Properties of the qcd matter:review of selected results from the relativistic heavy ion collider beam energy scan(RHIC BES)program

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Nuclear Science and Techniques 2024年第12期35卷 274-311页

作者： Jin‑Hui Chen Xin Dong Xiong‑Hong He Huan‑Zhong Huang Feng Liu Xiao‑Feng Luo Yu‑Gang Ma Li‑Juan Ruan Ming Shao Shu‑Su Shi Xu Sun Ai‑Hong Tang Ze‑Bo Tang Fu‑Qiang Wang Hai Wang Yi Wang Zhi‑Gang Xiao Guan‑Nan Xie Nu Xu Qing‑Hua Xu Zhang‑Bu Xu Chi Yang Shuai Yang Wang‑Mei Zha Ya‑Peng Zhang Yi‑Fei Zhang Jie Zhao Xiang‑Lei Zhu Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Nuclear Science Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA QMRC Institute of Modern PhysicsChinese Academy of SciencesLanzhouChina Department of Physics and Astrophysics University of CaliforniaLos AngelesCA 90095USA Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Department of Physics Brookhaven National LaboratoryUptonNY 11973USA Department of Modern Physics University of Science and Technology of ChinaHefeiChina Department of Physics Purdue UniversityWest LafayetteIN 47907USA Department of Engineering Physics Tsinghua UniversityBeijingChina Department of Physics Tsinghua UniversityBeijingChina School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Physics and Particle Irradiation(MOE) Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China Department of Physics Kent State UniversityKentOH 44242USA Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

In the paper,we discuss the development of the multigap resistive plate chamber time-of-fight(TOF)technology and the production of the solenoidal tracker at RHIC(STAR)TOF detector in China at the beginning of the twenty-frst ***,recent experimental results from the frst beam energy scan program(BES-I)at the Relativistic Heavy Ion Collider(RHIC)pertaining to measurements of collectivity,chirality,criticality,global polarization,strangeness,heavy favor,dilepton and light nuclei productions are reviewed.

关键词： Heavy ion collision Quark-gluon plasma qcd phase diagram Collectivity Chirality Criticality

Chiral symmetry restoration and deconfinement in the contact interaction model of quarks with parallel electric and magnetic fields

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Chinese Physics C 2021年第7期45卷 111-121页

作者： Aftab Ahmad Institute of Physics Gomal University29220D.I.KhanKhyber PakhtunkhawPakistan

We study the impact of steady,homogeneous,and external parallel electric and magnetic field strengths(eE||eB)on the chiral symmetry breaking-restoration and confinement-deconfinement phase *** also sketch the phase diagram of quantum chromodynamics(qcd)at a finite temperature T and in the presence of background *** unified formalism for this study is based on the Schwinger-Dyson equations,symmetry preserving vector-vector contact interaction model of quarks,and an optimal time regularization *** T=0,in the purely magnetic case(i.e.,eE→0),we observe the well-known magnetic catalysis ***,in a pure electric field background(eB→0),the electric field tends to restore the chiral symmetry and deconfinement above the pseudo-critical electric field eE^(x,C)_(c).In the presence of both eE and eB,we determine the magnetic catalysis effect in the particular region where eB dominates over eE,whereas we observe the chiral inhibition(or electric chiral rotation)effect when eE overshadows *** finite T,in the pure electric field case,the phenomenon of inverse electric catalysis appears to exist in the proposed ***,for a pure magnetic field background,we observe the magnetic catalysis effect in the mean-field approximation and inverse magnetic catalysis with eB-dependent *** combined effects of eE and eB on the pseudo-critical T^(x,C)_(c)yields an inverse electromagnetic catalysis,with and without an eB-dependent effective coupling of the *** findings of this study agree well with the already predicted results obtained via lattice simulations and other reliable effective models of qcd.

关键词： chiral symmetry breaking confinement electric and magnetic fields schwinger-dyson equations qcd phase diagram

Nonextensive effects on qcd chiral phase transition with a chiral chemical potential

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Chinese Physics C 2022年第10期46卷 98-106页

作者： Ya-Peng Zhao Shu-Yu Zuo Cheng-Ming Li School of Mathematics and Physics Henan Urban Construction UniversityPingdingshan 467036China College of Science Henan University of TechnologyZhengzhou 450000China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China

In this study,we investigate the qcd chiral phase diagram in the presence of a chiral chemical potential μ based on nonextensive statistical mechanics.A feature of this new statistic is a dimensionless nonextensivity parameter q,which summarizes all possible effects violating the assumptions of Boltzmann-Gibbs(BG)statistics(when q→1,it returns to the BG case).Within the nonextensive Polyakov-Nambu-Jona-Lasinio model,we find that as μ increases,the critical end point(CEP)in the T-μ plane continues to CEP_(5)in the T-μ plane,and nonextensive effects have a significant impact on the evolution from the CEP to CEP_(5).Generally,with an increase in q,both the CEP and CEP_(5)move in the direction of a lower temperature T and larger chemical potentialμ(μ_(5)).In addition,we find that chiral charge density ngenerally increases with T,μ,μ_(5),and *** study may provide useful hints about lattice qcd and relativistic heavy-ion collision experiments.

关键词： nonextensive statistics Polyakov-Nambu-Jona-Lasinio model qcd phase diagram chiral chemical potential

Search for qcd critical point by transverse velocity dependence of anti-deuteron to deuteron ratio

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Chinese Physics C 2020年第1期44卷 53-57页

作者： Ning Yu Dingwei Zhang Xiaofeng Luo School of Physics&Electronic Engineering Xinyang Normal UniversityXinyang 464000China Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China

We propose the transverse velocity(β_T) dependence of the anti-deuteron to deuteron ratio as a new observable to search for the qcd critical point in heavy-ion *** qcd critical point can attract the system evolution trajectory in the qcd phase diagram,which is known as the focusing *** quantify this effect,we employ the thermal and hadronic transport model to simulate the dynamical particle emission along a hypothetical focusing trajectory near the critical *** found that the focusing effect can lead to anomalous β_T dependence on ■/p,■/d and ■/~3 He *** examined the β_T dependence of ■/p and ■/d ratios of central Au+Au collisions at ■=7.7 to 200 GeV measured by the STAR experiment at ***,we only observe a negative slope in β_T dependence of ■/d ratio at ■=19.6 GeV,which indicates the trajectory evolution has passed through the critical *** the future,we could constrain the location of the critical point and/or width of the critical region by conducting precise measurements on the β_T dependence of the ■/d ratio at different energies and rapidity.

关键词： qcd critical point light nuclei heavy-ion collisions qcd phase diagram quark-gluon plasma

Effect of non-uniform efficiency on higher-order cumulants in heavy-ion collisions

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Chinese Physics C 2021年第12期45卷 62-79页

作者： Fan Si Yifei Zhang Xiaofeng Luo State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China

We perform a systematic study on the effect of non-uniform track efficiency correction in higher-order cumulant analysis in heavy-ion *** analytical derivation,we find that the true values of cumulants can be successfully reproduced by the efficiency correction with an average of the realistic detector efficiency for particles with the same charges within each single phase *** theoretical conclusions are supported by a toy model simulation by tuning the non-uniformity of the efficiency employed in the track-by-track efficiency correction *** valid averaged efficiency is found to suppress the statistical uncertainties of the reproduced cumulants ***,usage of the averaged efficiency requires a careful study of phase space *** study is important for carrying out precision measurements of higher-order cumulants in heavy-ion collision experiments at present and in future.

关键词： heavy ion collisions qcd phase diagram higher-order cumulants net-proton fluctuation Beam Energy Scan at RHIC