# Initial Stages 2021

Jan 10 – 15, 2021
Weizmann Institute of Science
Asia/Jerusalem timezone
See you at IS2023 in Copenhagen in June 2023

## $I_{\rm AA}$ in pp, p-Pb and Pb-Pb collisions as a function of the Underlying Event activity with ALICE

Jan 13, 2021, 7:45 PM
1h 30m
Patio (vDLCC)

### Patio

#### vDLCC

bullet talk (poster) The initial stages of heavy-ion collisions

### Speaker

Sushanta Tripathy (Universidad Nacional Autonoma (MX))

### Description

It is well established that high multiplicity pp and p-Pb collisions exhibit many of the signatures associated with the formation of a sQGP in heavy-ion collisions. If final-state interactions are responsible for this, one would also expect some amount of jet modification.

Here, we present the search for jet quenching effects by studying the yield of charged particles associated with high transverse momentum triggered particles measured with the ALICE detector in pp, p-Pb and Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. The study has been performed as a function of charged-particle multiplicity in the transverse region with respect to the leading-charged particle in the event. We observe a significant suppression in the yield of associated charged particles with $p_{\rm T}$ $>$ 4 GeV/$c$ in central Pb-Pb collisions relative to minimum bias pp collisions, while on the near side a moderate enhancement is found. However, we do not observe any suppression (enhancement) in away (near) side in pp and p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV relative to minimum bias pp collisions, which indicates that jet-quenching effects are small or absent in these systems.

### Primary author

Sushanta Tripathy (Universidad Nacional Autonoma (MX))

### Presentation materials

 IS-2021-BulletTalk-Sushanta-v3.mp4 IS-2021-Sushanta-v2.pdf