Light flavor hadron spectra at low $p_{T}$ and search for collective phenomena in high multiplicity pp, p-Pb and Pb-Pb collisions measured with the ALICE experiment

TL;DR

This paper analyzes light flavor hadron spectra at low transverse momentum in various collision systems to investigate collective phenomena, finding mass-dependent spectral shape changes indicative of possible hydrodynamic behavior.

Contribution

It provides a comparative study of hadron spectra across different collision systems and explores the presence of collective effects in small systems like pp and p-Pb.

Findings

Mass-dependent spectral hardening observed in Pb-Pb collisions.

Similar patterns of collective behavior found in small systems.

Hydrodynamical flow signatures are suggested in high multiplicity events.

Abstract

Comprehensive results on transverse momentum distributions and their ratios for identified light flavor hadrons ($\pi$, K, p) at low $p_{T}$ and mid-rapidity as a function of charged particle multiplicity are reported for pp collisions at 7 TeV. Particle mass dependent hardening of the spectral shapes in Pb-Pb collisions at 2.76 TeV were attributed to hydrodynamical flow and quantitatively parameterized with Boltzmann-Gibbs Blast Wave fits. In this contribution, we investigate the existence of collective phenomena in small systems: pp, p-Pb and peripheral Pb-Pb where similar patterns are observed in multiplicity dependent studies.