We study the transverse momentum(pr)differential anisotropic flow and flow fluctuation in Pb+Pb collisions at√S_(NN)=5.02 TeV at the LHC.A(3+1)-dimensional CLVisc hydrodynamics framework with fluctuating TRENTO(or AM...We study the transverse momentum(pr)differential anisotropic flow and flow fluctuation in Pb+Pb collisions at√S_(NN)=5.02 TeV at the LHC.A(3+1)-dimensional CLVisc hydrodynamics framework with fluctuating TRENTO(or AMPT)initial conditions is utilized to simulate the space-time evolution of the quark-gluon plasma(QGP)medium.The effects of shear viscosity and the sub-nucleon structure on anisotropic flow and flow fluctuation are analyzed.Our result shows that shear viscosity tends to suppress both flow coefficients(v_(2)(2),v_(2)(4),and<ν_(2))and flow fluctuation(δν_(2))owing to its smearing effect on local density fluctuation.The flow coefficients appear to be insensitive to the sub-nucleon structure,whereas the flow fluctuationδν_(2)tends to be suppressed by the sub-nucleon structure in central collisions but enhanced in peripheral collisions.After taking into account the subnucleon structure effect,our numerical result can qualitatively describe the relative flow fluctuations(v_(2){4}/v_(2){2},F(v_(2)))measured by the ALICE Collaboration at the LHC.We further investigate the effects of shear viscosity,subnucleon structure,and initial condition model on theflow angle and flow magnitude decorrelations(A_(2)^(f),M_(2)^(f))using the four-particle correlation method.We find that the flow decorrelation effect is typically stronger in central collisions than in peripheral collisions.The flow angle decorrelation is found to be insensitive to the shear viscosity and sub-nucleon structure,whereas the flow magnitude decorrelation shows quite different behaviors when using the TRENTO and AMPT initial condition models.Our study sheds light on the anisotropic flow,transport properties,and initial structure of the QGP created in high-energy nuclear collisions.展开更多
The final state particle multiplicity distributions in high-energy nucleus-nucleus collisions are described by two different sub-distributions contributed by a single nucleon. The Monte Carlo calculated results from t...The final state particle multiplicity distributions in high-energy nucleus-nucleus collisions are described by two different sub-distributions contributed by a single nucleon. The Monte Carlo calculated results from the two sub-distributions and the participant-spectator model are compared and found to be in agreement with the experimental data of Au-Au collisions at √s= 130 AGeV and Pb-Pb collisions at 158 AGeV.展开更多
基金Supported in part by the Natural Science Foundation of China(12225503,11890710,11890711,11935007)Zhu Jie is supported in part by the China Scholarship Council(202306770009)+1 种基金Wu Xiang-Yu is supported in part by the National Science Foundation within the framework of the JETSCAPE collaboration(OAC-2004571)in part by the Natural Sciences and Engineering Research Council of Canada.Some of the calculations were performed in the Nuclear Science Computing Center at Central China Normal University(NSC3),Wuhan,Hubei,China.
文摘We study the transverse momentum(pr)differential anisotropic flow and flow fluctuation in Pb+Pb collisions at√S_(NN)=5.02 TeV at the LHC.A(3+1)-dimensional CLVisc hydrodynamics framework with fluctuating TRENTO(or AMPT)initial conditions is utilized to simulate the space-time evolution of the quark-gluon plasma(QGP)medium.The effects of shear viscosity and the sub-nucleon structure on anisotropic flow and flow fluctuation are analyzed.Our result shows that shear viscosity tends to suppress both flow coefficients(v_(2)(2),v_(2)(4),and<ν_(2))and flow fluctuation(δν_(2))owing to its smearing effect on local density fluctuation.The flow coefficients appear to be insensitive to the sub-nucleon structure,whereas the flow fluctuationδν_(2)tends to be suppressed by the sub-nucleon structure in central collisions but enhanced in peripheral collisions.After taking into account the subnucleon structure effect,our numerical result can qualitatively describe the relative flow fluctuations(v_(2){4}/v_(2){2},F(v_(2)))measured by the ALICE Collaboration at the LHC.We further investigate the effects of shear viscosity,subnucleon structure,and initial condition model on theflow angle and flow magnitude decorrelations(A_(2)^(f),M_(2)^(f))using the four-particle correlation method.We find that the flow decorrelation effect is typically stronger in central collisions than in peripheral collisions.The flow angle decorrelation is found to be insensitive to the shear viscosity and sub-nucleon structure,whereas the flow magnitude decorrelation shows quite different behaviors when using the TRENTO and AMPT initial condition models.Our study sheds light on the anisotropic flow,transport properties,and initial structure of the QGP created in high-energy nuclear collisions.
文摘The final state particle multiplicity distributions in high-energy nucleus-nucleus collisions are described by two different sub-distributions contributed by a single nucleon. The Monte Carlo calculated results from the two sub-distributions and the participant-spectator model are compared and found to be in agreement with the experimental data of Au-Au collisions at √s= 130 AGeV and Pb-Pb collisions at 158 AGeV.
