Directed, Elliptic, and Higher Order Flow Harmonics of Protons, Deuterons, and Tritons in $\mathrm{Au}+\mathrm{Au}$ Collisions at $\sqrt{{s}_{NN}}=2.4\text{ }\text{ }\mathrm{GeV}$

Directed, Elliptic, and Higher Order Flow Harmonics of Protons, Deuterons, and Tritons in $Au + Au$ Collisions at $\sqrt{s_{N N}} = 2.4 GeV$

J. Adamczewski-Musch et al. (HADES Collaboration)

Phys. Rev. Lett. 125, 262301 – Published 31 December 2020

Abstract

Flow coefficients $v_{n}$ of the orders $n = 1 - 6$ are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons, and tritons as a function of centrality, transverse momentum, and rapidity in $Au + Au$ collisions at $\sqrt{s_{N N}} = 2.4 GeV$ . Combining the information from the flow coefficients of all orders allows us to construct for the first time, at collision energies of a few GeV, a multidifferential picture of the angular emission pattern of these particles. It reflects the complicated interplay between the effect of the central fireball pressure on the emission of particles and their subsequent interaction with spectator matter. The high precision information on higher order flow coefficients is a major step forward in constraining the equation of state of dense baryonic matter.