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arXiv · 2305.08806

Baryon inhomogeneities driven charge dependent directed flow in heavy ion collisions

Tribhuban Parida·Sandeep Chatterjee
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Abstract

Electromagnetic field in heavy ion collisions are expected to cause charge dependent directed flow splitting ($Δv_1$). Such charge dependent $Δv_1$ 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 $Δv_1$ 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 $Δv_1$ 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 $Δv_1$ of mesons leaving their interpretation open.

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Tribhuban Parida, Sandeep Chatterjee. 2023-05-15. Baryon inhomogeneities driven charge dependent directed flow in heavy ion collisions. https://arxiv.org/abs/2305.08806

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