# Hard Probes 2018: International Conference on Hard & Electromagnetic Probes of High-Energy Nuclear Collisions

September 30, 2018 to October 5, 2018
Aix-Les-Bains, Savoie, France
Europe/Zurich timezone
PROCEEDINGS OPEN UNTIL DECEMBER 15th 2018

## ALICE results on the production of charged particles in pp, p-Pb, Xe-Xe and Pb-Pb collisions at the LHC

Oct 2, 2018, 9:00 AM
20m
Aix-Les-Bains, Savoie, France

#### Aix-Les-Bains, Savoie, France

Aix-Les-Bains, Congress Center Student Lectures Day: September 30 at CERN
2a) Jets and high-pT hadrons (TALK)

### Speaker

Jacek Tomasz Otwinowski (Polish Academy of Sciences (PL))

### Description

We present the measurement of charged particle production at mid-rapidity ($|\eta| < 0.9$) in pp ($\sqrt{s}$ = 2.76 TeV, 5.02 TeV), p-Pb ($\sqrt{s_{\rm NN}}$ = 5.02 TeV), Xe-Xe ($\sqrt{s_{\rm NN}}$ = 5.44 TeV) and Pb-Pb ($\sqrt{s_{\rm NN}}$ = 2.76 TeV and 5.02 TeV) collisions with ALICE at the LHC. The transverse momentum ($p_{\rm T}$) spectra are measured in the broad range $0.15 < p_{\rm T} < 50$ GeV/$c$ and in the narrow centrality bins spanning the whole 0–100% interval. The $p_{\rm T}$ spectra measured in p-Pb, Xe-Xe and Pb-Pb collisions are compared to those in pp collisions in terms of nuclear modification factors and are compared with the parton energy loss models. A detailed comparison of nuclear modification factors in p–Pb and in peripheral A–A collisions will be discussed. The results suggest that the peripheral collisions can be affected by biases caused by the event selection and collision geometry, which can lead to an apparent nuclear modification even in the absence of jet quenching.

### Primary author

Jacek Tomasz Otwinowski (Polish Academy of Sciences (PL))