A Baseline Study of the Event-Shape and Multiplicity Dependence of Chemical Freeze-Out Parameters in Proton-Proton Collisions at \( {\sqrt{s}} \) = 13 TeV Using PYTHIA8

Rath, Rutuparna; Khuntia, Arvind; Tripathy, Sushanta; Sahoo, Raghunath

doi:10.3390/physics2040040

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A Baseline Study of the Event-Shape and Multiplicity Dependence of Chemical Freeze-Out Parameters in Proton-Proton Collisions at \( {\sqrt{s}} \) = 13 TeV Using PYTHIA8

and

^1,*

Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India

The H. Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, 31342 Krakow, Poland

Author to whom correspondence should be addressed.

Physics 2020, 2(4), 679-694; https://0-doi-org.brum.beds.ac.uk/10.3390/physics2040040

Received: 15 October 2020 / Revised: 2 December 2020 / Accepted: 3 December 2020 / Published: 10 December 2020

(This article belongs to the Special Issue Statistical Approaches in High Energy Physics)

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Abstract

The event-shape and multiplicity dependence of the chemical freeze-out temperature (

T_{ch}

), freeze-out radius (R), and strangeness saturation factor (

γ_{s}

) are obtained by studying the particle yields from the PYTHIA8 Monte Carlo event generator in proton-proton (pp) collisions at the centre-of-mass

\sqrt{s}

= 13 TeV. Spherocity is one of the transverse event-shape techniques to distinguish jetty and isotropic events in high-energy collisions and helps in looking into various observables in a more differential manner. In this study, spherocity classes are divided into three categories, namely (i) spherocity integrated, (ii) isotropic, and (iii) jetty. The chemical freeze-out parameters are extracted using a statistical thermal model as a function of the spherocity class and charged particle multiplicity in the canonical, strangeness canonical, and grand canonical ensembles. A clear observation of the multiplicity and spherocity class dependence of

T_{ch}

, R, and

γ_{s}

is observed. A final state multiplicity,

N_{ch} \geq

30 in the forward multiplicity acceptance of the ALICE detector appears to be a thermodynamic limit, where the freeze-out parameters become almost independent of the ensembles. This study plays an important role in understanding the particle production mechanism in high-multiplicity pp collisions at the Large Hadron Collider (LHC) energies in view of a finite hadronic phase lifetime in small systems. View Full-Text

Keywords: pp collisions; chemical freeze-out; thermalization

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Rath, R.; Khuntia, A.; Tripathy, S.; Sahoo, R. A Baseline Study of the Event-Shape and Multiplicity Dependence of Chemical Freeze-Out Parameters in Proton-Proton Collisions at \( {\sqrt{s}} \) = 13 TeV Using PYTHIA8. Physics 2020, 2, 679-694. https://0-doi-org.brum.beds.ac.uk/10.3390/physics2040040

AMA Style

Rath R, Khuntia A, Tripathy S, Sahoo R. A Baseline Study of the Event-Shape and Multiplicity Dependence of Chemical Freeze-Out Parameters in Proton-Proton Collisions at \( {\sqrt{s}} \) = 13 TeV Using PYTHIA8. Physics. 2020; 2(4):679-694. https://0-doi-org.brum.beds.ac.uk/10.3390/physics2040040

Chicago/Turabian Style

Rath, Rutuparna, Arvind Khuntia, Sushanta Tripathy, and Raghunath Sahoo. 2020. "A Baseline Study of the Event-Shape and Multiplicity Dependence of Chemical Freeze-Out Parameters in Proton-Proton Collisions at \( {\sqrt{s}} \) = 13 TeV Using PYTHIA8" Physics 2, no. 4: 679-694. https://0-doi-org.brum.beds.ac.uk/10.3390/physics2040040

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A Baseline Study of the Event-Shape and Multiplicity Dependence of Chemical Freeze-Out Parameters in Proton-Proton Collisions at \( {\sqrt{s}} \) = 13 TeV Using PYTHIA8

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