New Frontiers in Physics — Selected Papers of ICNFP 2021 (Part 1); Guest Editors: L. Bravina, S. Kabana, V. Volkova and V. I. ZakharovNo Access

Department of Physics, Kent State University, Kent, OH 44242, USA

For the STAR Collaboration.

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https://doi.org/10.1142/S0218301324420011Cited by:0 (Source: Crossref)

Abstract

Rapidity-odd directed flow ( $v_{1}$ ) of multi-strange baryons ( $Ξ$ and $Ω$ ) at mid-rapidity is reported for Au+Au collisions as recorded by the STAR detector at the Relativistic Heavy Ion Collider (RHIC). We focus on particle species where all constituent quarks are produced, such as $K^{-} (ū s)$ , $\bar{p} (ū ū \bar{d})$ , $\bar{Λ} (ū \bar{d} \bar{s})$ , $ϕ (s \bar{s})$ , ${\bar{Ξ}}^{+} (\bar{d} \bar{s} \bar{s})$ , $Ω^{-} (s s s)$ and ${\bar{Ω}}^{+} (\bar{s} \bar{s} \bar{s})$ , and demonstrate using a novel analysis method that the coalescence sum rule holds in a common kinematic region for hadron combinations with identical quark content. We examine the coalescence sum rule as a function of rapidity for nonidentical quark content having the same quark-level mass but different strangeness ( $Δ S$ ) and electric charge ( $Δ q$ ). The difference in the directed flow of different quark and anti-quark combinations, e.g., $v_{1} (Ω^{-} (s s s)) - v_{1} ({\bar{Ω}}^{+} (\bar{s} \bar{s} \bar{s}))$ , is a measure of coalescence sum rule violation, and we call it directed flow splitting ( $Δ v_{1}$ ). We measure $Δ S$ and $Δ q$ dependence of the $Δ v_{1}$ slope ( $d Δ v_{1} ∕ d y$ ) between produced quarks and anti-quarks in Au+Au collisions at $\sqrt{s_{N N}} = 27$ GeV and 200GeV. Measurements have been compared with A Multi-Phase Transport (AMPT) and Parton-Hadron String Dynamics (PHSD) models with electromagnetic field calculations.

Based on a presentation at the 10th International Conference on New Frontiers in Physics (ICNFP 2021).

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