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Equation of state dependence of directed flow in a microscopic transport model

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arxiv 1611.08023 v1 pith:AHRYGQ4T submitted 2016-11-23 nucl-th hep-phnucl-ex

Equation of state dependence of directed flow in a microscopic transport model

classification nucl-th hep-phnucl-ex
keywords directedflowtransportbeamdependenceenergymodelapproach
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the sensitivities of the directed flow in Au+Au collisions on the equation of state (EoS), employing the transport theoretical model JAM. The EoS is modified by introducing a new collision term in order to control the pressure of a system by appropriately selecting an azimuthal angle in two-body collisions according to a given EoS. It is shown that this approach is an efficient method to modify the EoS in a transport model. The beam energy dependence of the directed flow of protons is examined with two different EoS, a first-order phase transition and crossover. It is found that our approach yields quite similar results as hydrodynamical predictions on the beam energy dependence of the directed flow; Transport theory predicts a minimum in the excitation function of the slope of proton directed flow and does indeed yield negative directed flow, if the EoS with a first-order phase transition is employed. Our result strongly suggests that the highest sensitivity for the critical point can be seen in the beam energy range of $4.7\leq\srtNN\leq11.5$ GeV.

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Cited by 2 Pith papers

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  1. Observation of Strong $\phi$-meson Directed Flow at High Baryon Density

    nucl-ex 2026-06 unverdicted novelty 8.0

    First observation of phi-meson directed flow v1 comparable in magnitude to protons and Lambdas but much larger than K0S, with baryon-like energy dependence at high baryon density.

  2. Machine learning the impact parameter in heavy-ion collisions at $\sqrt{s_{\rm NN}}$ = 4 and 11 GeV: a cross-check study with UrQMD, AMPT, and JAM

    nucl-th 2026-07 conditional novelty 4.0

    A LightGBM model trained on pion observables from one transport model predicts impact parameters in Au+Au collisions at 4 and 11 GeV with 0.2-0.4 fm error, generalizing to data from other models where polynomial fits fail.