arXiv subjects

Zhi-Min Wu

Publications and source records attributed to Zhi-Min Wu.

3 recordsLinked to original sources

arXiv2026

Constraining the Phase-Transition EoS using the Energy Dependence of Directed Flow

We propose a hybrid equation of state (VDF+MIT EoS) to describe the hadron-quark phase transition in dense nuclear matter. By coupling this EoS with the AMPT-HC transport model and comparing to recent experimental data on proton and $Λ$ directed flow $v_1$, we constrain the transition to likely occur near $5ρ_0$--$6ρ_0$, ruling out transitions below $3ρ_0$. Furthermore, we introduce the energy derivative of the mid-rapidity $v_1$ slope, $d(dv_1/dy)/d(\sqrt{s_{NN}})$, as a weakly model-dependent observable. Its zero crossing provides a direct signature of the phase transition critical point, offering a new tool for mapping the QCD phase diagram in future experiments.

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arXiv2024

$Ω^-$ production as a probe of equation of state of dense matter near the QCD phase transition in relativistic heavy-ion collisions

The production of doubly strange hyperon $Ξ^-$ and trebly strange hyperon $Ω^-$ in relativistic Au+Au collisions at $\sqrt{s_{NN}}$ = 4.2 GeV is explored based on a relativistic transport model that is interweaved with hadronic mean-field potentials for heavy-ion collisions. Upon comparison, it appears that relative to the double strangeness observable $Ξ^-$, the yield and collective flows of the triple strange $Ω^-$ exhibit a higher sensitivity to the equation of state (EoS) of dense matter. This characteristic makes the $Ω^-$ an essential observable for studying the properties of densely formed matter in relativistic heavy-ion collisions.

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arXiv2023

Probing the incompressibility of dense hadronic matter near QCD phase transition in relativistic heavy-ion collisions

Based on the extended hadronic transport model of relativistic heavy-ion collisions, the incompressibility of dense hadronic matter created in relativistic Au+Au heavy-ion collisions at $\sqrt{s_{NN}} = 3$ GeV is studied. By comparing experimental proton directed flow, productions of strange hadrons $ϕ$, $K^{-}$ as well as their ratio $ϕ/K^{-}$, proton high-order cumulants to the model calculations, a large incompressibility of dense hadronic matter is obtained from nucleon observabels while a rather small incompressibility is needed to fit the data of strange hadrons. This may indicate hadronic matter possesses different incompressibilities in different density regions, i.e., the incompressibility may become stiffer from saturation density to a certain baryon density and then turn to soft before reaching hadron-quark phase transition. The study also shows that the incompressibility significantly affects the critical baryon density of hadron-quark phase transition.

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