Speakers
Description
In late 2015, the ALICE collaboration recorded data from Pb-Pb collisions at the unprecedented energy of $\sqrt{s_{NN}}$ = 5.02 TeV as well as data from pp collisions
at the same energy, to be used as a reference for heavy-ions. In Pb-Pb collisions a strongly coupled Quark Gluon Plasma (QGP) is produced which gives rise to collective
phenomena whose signatures can be retrieved in final state hadronic observables. Recent observations in small systems, such as pp and p-Pb collisions, show remarkable
similarities among these systems, which are highly suggestive of the presence of collectivity. Current research therefore tries to identify whether a unified description
of the pp, p-A and A-A data can be established.
Hydrodynamic and recombination models are tested against the measured spectral shapes at low and intermediate transverse momenta. In particular, the Boltzmann-Gibbs blast-wave
is a three-parameter simplified hydrodynamical model whose parameters (kinetic freeze-out temperature, average transverse velocity, exponent of the velocity profile) can be studied
for various collision systems and energies.
In this talk, an overview of the new ALICE results which contribute to the understanding of collective phenomena will be presented. Pion, kaon, proton $p_T$-spectra
and the result of a blast-wave fit are presented for pp collisions at $\sqrt{s}$ = 7 TeV, Pb-Pb at $\sqrt{s_{NN}}$ = 2.76 TeV, p-Pb and Pb-Pb at $\sqrt{s_{NN}}$ = 5.02 TeV.
The dependence of the blast-wave model parameters on the event multiplicity is also discussed.
