Abstract
Abstract We compare the microscopic transport models UrQMD, PHSD, PHQMD, and SMASH to make predictions for the upcoming Ag + Ag data at E lab = 1.58A GeV ( s NN = 2.55 GeV) by the HADES collaboration. We study multiplicities, spectra and effective source temperatures of protons, π ±,0, K ±, the η, Λ + Σ0 and the Ξ− within these models. Despite variations in the detailed implementation of the dynamics in the different models, the employed transport approaches all show consistent multiplicities of the bulk of investigated hadrons. The main differences are in the Ξ− production, which is treated differently between UrQMD/SMASH on one side employing high mass resonance states with explicit decays to Resonance → Ξ + K + K in contrast to PHSD/PHQMD which account only non-resonant Ξ production channels. A comparison of the spectra, summarized by effective source temperatures, shows that all models provide similar source temperatures around T source = 80–95 MeV, and show substantial radial flow on the order of ⟨v T ⟩ = 0.18c − 0.24c even for such a small system.
Highlights
Over the last two decades, collider facilities such as the Relativistic Heavy-Ion Collider (RHIC) located at Brookhaven National Laboratory (BNL) or the Large Hadron Collider (LHC) at European Organization for Nuclear Research (CERN) have studied the strongly interacting matter created in heavy-ion collisions at relativistic energies
Motivated by upcoming High Acceptance Di-Electron Spectrometer (HADES) data of Ag+Ag collisions at 1.58 AGeV kinetic beam energy, we present a comparative analysis of bulk properties of p, π±,0, K±, η, Λ + Σ0 and Ξ− hadrons employing the most prominent transport approaches used at SIS energies, namely UrQMD [19, 20], Parton-Hadron-String Dynamics (PHSD) [21, 22], PHQMD [27] and Simulating Many Accelerated Strongly-interacting Hadrons (SMASH) [24]
In this study we compared a full breadth of established microscopic transport models to make predictions fo√r the upcoming Ag+Ag data at Elab = 1.58 AGeV by the HADES collaboration
Summary
Over the last two decades, collider facilities such as the Relativistic Heavy-Ion Collider (RHIC) located at Brookhaven National Laboratory (BNL) or the Large Hadron Collider (LHC) at European Organization for Nuclear Research (CERN) have studied the strongly interacting matter created in heavy-ion collisions at relativistic energies. At very low beam energies, this high-μB region of the QCD phase diagram is currently explored by the High Acceptance Di-Electron Spectrometer (HADES) experiment [1] at GSI which has firmly established its abilities to precisely measure di-leptons and constrain vectormeson spectral functions [2, 3], to determine event-byevent correlations and fluctuations [4], to investigate final state n-particle correlations [5] and to measure rare probes and sub-threshold strangeness production [6–8]. HADES has reported first preliminary data on hadron production and di-lepton measurements in s√ilver-silver (Ag+Ag) collisions at Elab = 1.58 AGeV ( sNN = 2.55 GeV) [9, 10]. This will allow to pin-down the properties of dense hadronic matter further and complements the data on Au+Au reactions taken in the past. We compare particle production mechanisms and the different Equations-of-State via total multiplicities, rapidity and transverse mass distributions and extract an effective temperature Teff from the transverse mass spectra
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