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The event-shape and multiplicity dependence of the chemical freeze-outtemperature ($T_{\text{ch}}$), freeze-out radius ($R$), and strangenesssaturation factor ($\gamma_{s}$) are obtained by studying the particle yieldsfrom the PYTHIA8 Monte Carlo event generator in proton-proton (pp) collisionsat the centre-of-mass $\sqrt{s}$ = 13 TeV. Spherocity is one of the transverseevent-shape techniques to distinguish jetty and isotropic events in high-energycollisions and helps in looking into various observables in a more differentialmanner. In this study, spherocity~classes are divided into three categories,namely (i) spherocity integrated, (ii) isotropic, and~(iii) jetty. The~chemicalfreeze-out parameters are extracted using a statistical thermal model as afunction of the spherocity class and charged particle multiplicity in thecanonical, strangeness canonical, and grand canonical ensembles. A clearobservation of the multiplicity and spherocity class dependence of$T_{\text{ch}}$, $R$, and $\gamma_{s}$ is observed. A final state multiplicity,$N_{\rm ch}\geq$ 30 in the forward multiplicity acceptance of the ALICEdetector appears to be a thermodynamic limit, where the freeze-out parametersbecome almost independent of the ensembles. This~study plays an important rolein understanding the particle production mechanism in high-multiplicity ppcollisions at the Large Hadron Collider (LHC) energies in view of a finitehadronic phase lifetime in small systems.

physics

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