# Quark Matter 2019 - the XXVIIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions

3-9 November 2019
Wanda Reign Wuhan Hotel
Asia/Shanghai timezone

## Comparison of Chemical freeze-out parameters in p+p, p+Pb, Xe+Xe and Pb+Pb collisions at LHC energies

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

#### Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Small systems

### Speaker

Arvind Khuntia (Indian Institute of Technology Indore (IN))

### Description

In this work, we have presented the collision energy, multiplicity and system size dependence of chemical freeze-out parameters such as chemical freeze-out temperature ($T_{\rm ch}$) and strangeness saturation factor ($\gamma_{s}$). These parameters are obtained by analysing the particle ratios at different Large Hadron Collider (LHC) energies using statistical thermal model (THERMUS). Here, we consider the particle ratios obtained recently in pp collisions at $\sqrt{s}$ = 13 TeV, p+Pb at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, Xe+Xe at $\sqrt{s_{\rm NN}}$ = 5.44 TeV and Pb+Pb at $\sqrt{s_{\rm NN}}$ =5.02 TeV. In addition, we look into the energy dependence of chemical freeze-out parameters by comparing with pp collisions at $\sqrt{s}$ = 7 TeV and Pb+Pb at $\sqrt{s_{\rm NN}}$ =2.76 TeV results in our study. The particle production from small to large systems has been addressed by considering two ensembles namely, canonical and grand canonical. The results obtained in this study shows a clear multiplicity dependence of $T_{\rm ch}$ and $\gamma_{s}$. The values obtained in high multiplicity pp collisions are similar to the peripheral Pb+Pb collisions. In future, high multiplicity triggered pp events will add more insight about the strangeness chemical equilibrium and to understand the particle production mechanism in smaller collision systems.

### Primary authors

Rutuparna Rath (Indian Institute of Technology Indore (IN)) Arvind Khuntia (Indian Institute of Technology Indore (IN)) Raghunath Sahoo (Indian Institute of Technology Indore (IN))

### Presentation Materials

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