Strangeness in Quark Matter 2016

Measurement of higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at sNN=2.76 TeV

30 Jun 2016, 09:00

20m

102 (Clark Kerr Campus)

Contributed Talk Flow

Speaker

Naghmeh Mohammadi (Nikhef National institute for subatomic physics (NL))

Description

The latest ALICE results on the centrality and transverse momentum dependence of $v_2$, $v_3$, $v_4$ and $v_5$ for ${\pi }^{\pm }$, ${\mathrm{K}}^{\pm }$ and p+$\bar{\mathrm{p}}$ in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV are presented. The values of these flow coefficients exhibit a clear mass ordering for $p_{\mathrm{T}}<3$ $\mathrm{GeV}/c$ for all harmonics. For transverse momentum values larger than about 3 $\mathrm{GeV}/c$, mesons exhibit distinctive flow values compared to baryons, suggesting that coalescence might be the relevant particle production mechanism in this region. The experimental data for $p_{\mathrm{T}}<3$ $\mathrm{GeV}/c$ are described fairly well by the hydrodynamical model iEBE-VISHNU, which models the hydrodynamical expansion of the fireball using a value of $\eta /s=0.08$, coupled to a hadronic cascade model (UrQMD). Finally, we find that predictions from A Multi-Phase Transition Model (AMPT) indicate the late hadronic rescattering stage contributes significantly to the mass splitting of azimuthal flow (n=2-4). These predictions are compared to our data.

Presentation materials

SQM2016.pdf

Peer reviewing

Paper

Accepted on 12 Oct 2016 by Jochen Thaeder

proceeding.pdf