# Quark Matter 2018

May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## Elliptic flow coefficients of identified hadrons in pp and p-Pb collisions measured with ALICE

May 14, 2018, 4:30 PM
20m
Sala Mosaici-1, 3rd Floor (Palazzo del Casinò)

### Sala Mosaici-1, 3rd Floor

#### Palazzo del Casinò

Parallel Talk Collectivity in small systems

### Speaker

Vojtech Pacik (University of Copenhagen (DK))

### Description

Recent observations of long-range multi-particle azimuthal correlations in p-Pb and high multiplicity pp collisions provided new insights into collision dynamics and opened a possibility to study collective effects in these small systems.
In this talk, we present new measurements of $p_{\text{T}}$-differential elliptic flow coefficient $v_2$ for a variety of identified charged hadrons from pp and p-Pb collisions recorded by ALICE during the LHC Run 2 operation. The results for $v_2(p_{\text{T}})$ measured for $\pi^{\pm}$, $\text{K}^{\pm}$, $\text{K}^0_{\text{S}}$, p/$\bar{\text{p}}$, $\phi$ and $\Lambda/\bar{\Lambda}$ in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV are shown. Minimum-bias pp collisions are used to estimate and subtract the non-flow contribution in p-Pb measurements. Additionally, we present first measurements of $v_2$ of identified particles in pp collisions at $\sqrt{s}$ = 13 TeV.
The $p_{\text{T}}$ dependence, characteristic mass ordering and number of constituent quark scaling of $v_2$ allows us to test various theoretical models, constrain the initial conditions, and probe collective effects in small collision systems. Measurements of the $v_2$ of the $\phi$-meson, in particular, given it features a mass close to that of the proton, provide an opportunity to examine the particle production mechanism via quark recombination scenario.

Content type Experiment Presenter name already specified ALICE