Event Shape and Multiplicity Dependence of Freeze-Out Scenario and System Thermodynamics in Proton+Proton Collisions at Using PYTHIA8

Raghunath Sahoo (Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India) ; Sushanta Tripathy (Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India) ; Ashish Bisht (Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India) ; Arvind Khuntia (Institute of Nuclear Physics, Polish Academy of Science (PAS), IFJ PAN, Krakow, Poland) ; Malavika Panikkassery Salvan (National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu, India)

Recent observations of QGP-like conditions in high-multiplicity pp collisions from ALICE experiment at the LHC warrant an introspection whether to use pp collisions as a baseline measurement to characterize heavy-ion collisions for the possible formation of a Quark-Gluon Plasma. A double differential study of the particle spectra and thermodynamics of the produced system as a function of charged-particle multiplicity and transverse spherocity in pp collisions would shed light on the underlying event dynamics. Transverse spherocity, one of the event shape observables, allows to separate the events in terms of jetty and isotropic events. We analyse the identified particle transverse momentum (pT) spectra as a function of charged-particle multiplicity and transverse spherocity using Tsallis nonextensive statistics and Boltzmann-Gibbs Blast-Wave (BGBW) model in pp collisions at s=13 TeV using PYTHIA8 event generator. The extracted parameters such as temperature (T), radial flow (β), and nonextensive parameter (q) are shown as a function of charged-particle multiplicity for different spherocity classes. We observe that the isotropic events approach thermal equilibrium while the jetty ones remain far from equilibrium. We argue that, while studying the QGP-like conditions in small systems, one should separate the isotropic events from the spherocity-integrated events, as the production dynamics are different.

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  "abstracts": [
    {
      "source": "Hindawi", 
      "value": "Recent observations of QGP-like conditions in high-multiplicity pp collisions from ALICE experiment at the LHC warrant an introspection whether to use pp collisions as a baseline measurement to characterize heavy-ion collisions for the possible formation of a Quark-Gluon Plasma. A double differential study of the particle spectra and thermodynamics of the produced system as a function of charged-particle multiplicity and transverse spherocity in pp collisions would shed light on the underlying event dynamics. Transverse spherocity, one of the event shape observables, allows to separate the events in terms of jetty and isotropic events. We analyse the identified particle transverse momentum (<math id=\"M2\"><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math>) spectra as a function of charged-particle multiplicity and transverse spherocity using Tsallis nonextensive statistics and Boltzmann-Gibbs Blast-Wave (BGBW) model in pp collisions at <math id=\"M3\"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext>TeV</mtext></math> using PYTHIA8 event generator. The extracted parameters such as temperature (<math id=\"M4\"><mi>T</mi></math>), radial flow (<math id=\"M5\"><mi>\u03b2</mi></math>), and nonextensive parameter (<math id=\"M6\"><mi>q</mi></math>) are shown as a function of charged-particle multiplicity for different spherocity classes. We observe that the isotropic events approach thermal equilibrium while the jetty ones remain far from equilibrium. We argue that, while studying the QGP-like conditions in small systems, one should separate the isotropic events from the spherocity-integrated events, as the production dynamics are different."
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Published on:
23 February 2021
Publisher:
Hindawi
Published in:
Advances in High Energy Physics (2021)

DOI:
https://doi.org/10.1155/2021/8822524
arXiv:
1905.07418
Copyrights:
Copyright © 2021 Sushanta Tripathy et al.
Licence:
CC-BY-3.0

Fulltext files: