Electric-charge-dependent directed flow splitting of produced quarks in Au+Au collisions

Abstract

We report directed flow ($v_1$) of multistrange baryons ($\Xi$ and $\Omega$) and improved $v_1$ data for $K^{-}$, $\bar{p}$, $\bar{\Lambda }$ and $\varphi$ in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=$27 and 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). We focus on particles whose constituent quarks are not transported from the incoming nuclei but instead are produced in the collisions. At intermediate impact parameters, we examine quark coalescence behavior for particle combinations with identical quark content, and search for any departure from this behavior (``splitting'') for combinations having non-identical quark content. Under the assumption of quark coalescence for produced quarks, the splitting strength appears to increase with the electric charge difference of the constituent quarks in the combinations, consistent with electromagnetic effect expectations.

6 pages, 6 figures

References in corpus (7)

• Glauber Modeling in High Energy Nuclear Collisions
• Hydrodynamic Models for Heavy Ion Collisions
• Charge-dependent directed flow in asymmetric nuclear collisions
• Charge-dependent flow as evidence of strong electromagnetic fields in heavy-ion collisions
• Azimuthal Anisotropy: Ridges, Recombination and Breaking of Quark Number Scaling
• Splitting of proton-antiproton directed flow in relativistic heavy-ion collisions
• Testing the impact of electromagnetic fields on the directed flow of constituent quarks in heavy-ion collisions