Effects of a phase transition on two-pion interferometry in heavy ion collisions at √SNN=2.4-7.7 GeV

查看全文 作　　者：Pengcheng [1,2,3]Li;Jan [4]Steinheimer;Tom [1,6]Reichert;Apiwit [1,7]Kittiratpattana;Marcus [1,5,6]Bleicher;Qingfeng [2]Li

机构地区：[1]Institut fur Theoretische Physik,Johann Wolfgang Goethe Universitat Frankfurt,Frankfurt am Main 60438,Germany;[2]School of Science,Huzhou University,Huzhou 313000,China;[3]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;[4]Frankfurt Institute for Advanced Studies,Frankfurt am Main 60438,Germany;[5]GSI Helmholtzzentrum f¨urSchwerionenforschung GmbH,Darmstadt 64291,Germany;[6]Helmholtz Research Academy Hesse for FAIR(HFHF),GSI Helmholtz Center for Heavy Ion Physics,Campus Frankfurt,Frankfurt am Main 60438,Germany;[7]Center of Excellence in High Energy Physics&Astrophysics,School of Physics,Suranaree University of Technology,Nakhon Ratchasima 30000,Thailand

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2023年第66卷第3期,共10页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11875125,and 12075085);financial support from China Scholarship Council(Grant No.202106180053);Samson AG for funding。 摘　　要：Hanbury-Brown-Twiss(HBT) correlations for charged pions in central Au+Au collisions at √SNN=2.4-7.7 GeV(corresponding to beam kinetic energies in the fixed target frame from Elab=1.23 to 30 GeV/nucleon) are calculated using the ultra-relativistic quantum molecular dynamics model with different equations of state(EoSs).The effects of a phase transition at high baryon densities are clearly observed in the explored HBT parameters.The results show that the available data on the HBT radii,RO/RSand R^(2)_(O)-R^(2)_(S),in the investigated energy region favor a relatively stiff EoS at low beam energies,which then turns into a soft EoS at high collision energies consistent with astrophysical constraints on the high-density EoS of quantum chromodynamics(QCD).The specific effects of two different phase transition scenarios on RO/RSand R^(2)_(O)-R^(2)_(S)are investigated.A phase transition with a significant softening of the EoS below four times the nuclear saturation density can be excluded using HBT data.Our results highlight that the pion’s RO/RSand R^(2)_(O)-R^(2)_(S)are sensitive to the stiffness of the EoS and can be used to constrain and understand the QCD EoS in a high baryon density region. 关键词：heavy ion collisions HBT correlation equation of state

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Effects of a phase transition on two-pion interferometry in heavy ion collisions at √SNN=2.4-7.7 GeV

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