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Baryon inhomogeneities driven charge dependent directed flow in heavy ion collisions
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abstract
Electromagnetic field in heavy ion collisions are expected to cause charge dependent directed flow splitting ($\Delta v_1$). Such charge dependent $\Delta v_1$ has been observed by the STAR collaboration. We demonstrate that relativistic dissipative fluid dynamic simulations with baryon diffusion that include realistic model of baryon stopping in the initial condition and no contribution from electromagnetic field describe the measured $\Delta v_1$ for observables involving baryons and anti-baryons. This suggests strong background contribution from baryon current as a response to initial state baryon inhomogeneities to such charge dependent $\Delta v_1$ involving baryons and anti-baryons. Our current model calculations that only account for the evolution of the baryon charge and not electric charge and strangeness miss the observed $\Delta v_1$ of mesons leaving their interpretation open.
Forward citations
Cited by 4 Pith papers
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Phenomenology of baryon dynamics with directed flow in relativistic heavy-ion collisions
A two-component initial baryon deposition model plus hydrodynamics reproduces baryon-antibaryon directed flow splitting across sqrt(sNN) = 7.7 to 200 GeV and yields a model-based baryon diffusion coefficient.
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Measurement of charge-dependent directed flow in STAR Beam Energy Scan (BES-II) Au+Au and U+U collisions
STAR measures charge-dependent directed-flow slopes for pions, kaons, and protons in U+U at 193 GeV and Au+Au at 7.7 to 19.6 GeV, finding system-size ordering and energy-dependent sign changes for protons.
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Impact of particle production mechanisms on pseudorapidity distribution and directed flow in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 19.6 GeV using AMPT model
String fragmentation parameters in the AMPT model change proton directed flow and its system-size dependence at 19.6 GeV, while leaving pions nearly unaffected.
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Investigating effects of the electrical conductivity of QCD matter on charge-dependent directed flow
Using 3+1D resistive magnetohydrodynamics, the authors show that the slope of proton-antiproton charge-dependent directed flow in Au+Au collisions at 200 GeV varies with the QGP's electrical conductivity and can chang...
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