Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies

Le résumé fourni par la source

The first (${v}_{1}^{\mathrm{fluc}}$), second (${v}_{2}$), and third (${v}_{3}$) harmonic coefficients of the azimuthal particle distribution at midrapidity are extracted for charged hadrons and studied as a function of transverse momentum (${p}_{T}$) and mean charged particle multiplicity density $⟨{N}_{\mathrm{ch}}⟩$ in $U+U$ ($\sqrt{{s}_{NN}}=193\text{ }\text{ }\mathrm{GeV}$), $\mathrm{Au}+\mathrm{Au}$, $\mathrm{Cu}+\text{Au}$, $\mathrm{Cu}+\mathrm{Cu}$, $d+\mathrm{Au}$, and $p+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$ with the STAR detector. For the same $⟨{N}_{\mathrm{ch}}⟩$, the ${v}_{1}^{\mathrm{fluc}}$ and ${v}_{3}$ coefficients are observed to be independent of the collision system, while ${v}_{2}$ exhibits such a scaling only when normalized by the initial-state eccentricity (${ϵ}_{2}$). The data also show that $\mathrm{ln}({v}_{2}/{ϵ}_{2})$ scales linearly with $⟨{N}_{\mathrm{ch}}{⟩}^{\ensuremath{-}1/3}$. These measurements provide insight into initial-geometry fluctuations and the role of viscous hydrodynamic attenuation on ${v}_{n}$ from small to large collision systems.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.