Beam-Energy Dependence of Directed Flow of $\mathrm{\ensuremath{\Lambda}}$, $\overline{\mathrm{\ensuremath{\Lambda}}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}_{s}^{0}$, and $\ensuremath{\phi}$ in $\mathrm{Au}+\mathrm{Au}$ Collisions

STAR Collaboration

Beam-Energy Dependence of Directed Flow of $\mathrm{\ensuremath{\Lambda}}$, $\overline{\mathrm{\ensuremath{\Lambda}}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}_{s}^{0}$, and $\ensuremath{\phi}$ in $\mathrm{Au}+\mathrm{Au}$ Collisions

Files

PhysRevLett.120.062301.pdf (331.61 KB)

Date

2018

Authors

STAR Collaboration

Publisher

American Physical Society

Abstract

Rapidity-odd directed-flow measurements at midrapidity are presented for Λ, ¯Λ, K±, K0s, and ϕ at √sNN=7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV in Au+Au collisions recorded by the Solenoidal Tracker detector at the Relativistic Heavy Ion Collider. These measurements greatly expand the scope of data available to constrain models with differing prescriptions for the equation of state of quantum chromodynamics. Results show good sensitivity for testing a picture where flow is assumed to be imposed before hadron formation and the observed particles are assumed to form via coalescence of constituent quarks. The pattern of departure from a coalescence-inspired sum rule can be a valuable new tool for probing the collision dynamics.

Type

Journal article

Citation

STAR Collaboration. "Beam-Energy Dependence of Directed Flow of $\ensuremathΛ$ , $\ensuremathΛ―$ , $K\ifmmode±\else±\fi$ , $Ks0$ , and $\ensuremathϕ$ in $Au+Au$ Collisions." Physical Review Letters, 120, no. 6 (2018) American Physical Society: https://doi.org/10.1103/PhysRevLett.120.062301.

Published Version

https://doi.org/10.1103/PhysRevLett.120.062301

Rights

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and