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Article

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

1
Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India
2
The H. Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, 31342 Krakow, Poland
*
Author to whom correspondence should be addressed.
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)
The event-shape and multiplicity dependence of the chemical freeze-out temperature (Tch), freeze-out radius (R), and strangeness saturation factor (γs) are obtained by studying the particle yields from the PYTHIA8 Monte Carlo event generator in proton-proton (pp) collisions at the centre-of-mass 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 Tch, R, and γs is observed. A final state multiplicity, Nch 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 pp collisions; chemical freeze-out; thermalization
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MDPI and ACS 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, 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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