Measuring hydrodynamical expansion via the production of identified hadrons in Pb$-$Pb collisions with ALICE

Abstract

During the LHC Run-2, ALICE has collected data from Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. The centrality dependence of identified particle production, including elliptic ($v_2$) and higher harmonic flow coefficients ($v_3,v_4$), has been measured. The high-precision measurement of transverse momentum ($p_{\mathrm{T}}$) differential elliptic flow of the $\varphi$-meson (whose mass is close to that of the proton) allows for a unique testing of mass ordering at low $p_{\mathrm{T}}$ as well as baryon and meson grouping at intermediate $p_{\mathrm{T}}$. The $p_{\mathrm{T}}$-differential hadron spectra are presented and, together with flow coefficients, compared with state-of-the-art calculations from models based on relativistic hydrodynamics coupled with UrQMD. The added transport code is to describe rescattering in the hadronic phase, which has been successful in describing the $p_{\mathrm{T}}$-spectra of identified particles up to a few GeV/$c$. Moreover, results from the simultaneous Blast-Wave fit to the $p_{\mathrm{T}}$ distributions are compared across multiple collisions energies and system sizes in order to address the evolution of collective behaviour from small systems to large systems.

arXiv comment4 pages, 8 figures, Proceedings for the contribution presented at the conference 'Rencontres de Moriond QCD and High Energy Interactions'

Cited by in corpus (1)

• Testing the system size dependence of hydrodynamical expansion and thermal particle production with $\pi$, K, p, and $\varphi$ in Xe-Xe and Pb-Pb collisions with ALICE