Baseline study for net-proton number fluctuations at top energies available at the BNL Relativistic Heavy Ion Collider and at the CERN Large Hadron Collider with the Angantyr model

Nirbhay Kumar Behera (Inha University, 100 Inharo, Nam-gu, Incheon 22212, Korea; Indian Institute of Technology Madras, Chennai 600036, India) ; Ranjit Kumar Nayak (Indian Institute of Technology Bombay, Mumbai 400076, India) ; Sadhana Dash (Indian Institute of Technology Bombay, Mumbai 400076, India)

The multiplicity percentile dependence of cumulants, of net-proton number distributions in Au-Au collisions at sNN=200 GeV and Pb-Pb collisions at sNN=2.76 TeV, has been investigated using the Angantyr model (the heavy-ion extension of the pythia 8 model). The effects of finite transverse momentum (pT) and pseudorapidity (η) acceptance on the net-proton cumulants have also been studied. Furthermore, the effects of the hydrodynamic expansion and feed down from weak decays were explored. It was found that radial flow has substantial impact on the cumulants and their ratios, while weak decays have a finite but relatively smaller effect. The obtained values of cumulants and their ratios with the Angantyr model, where the formation of thermalized medium is not assumed, can serve as a baseline for future measurements.

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      "title": "Baseline study for net-proton number fluctuations at top energies available at the BNL Relativistic Heavy Ion Collider and at the CERN Large Hadron Collider with the Angantyr model"
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      "value": "The multiplicity percentile dependence of cumulants, of net-proton number distributions in Au-Au collisions at <math><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>200</mn></mrow></math> GeV and Pb-Pb collisions at <math><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>2.76</mn></mrow></math> TeV, has been investigated using the Angantyr model (the heavy-ion extension of the pythia 8 model). The effects of finite transverse momentum (<math><msub><mi>p</mi><mi>T</mi></msub></math>) and pseudorapidity (<math><mi>\u03b7</mi></math>) acceptance on the net-proton cumulants have also been studied. Furthermore, the effects of the hydrodynamic expansion and feed down from weak decays were explored. It was found that radial flow has substantial impact on the cumulants and their ratios, while weak decays have a finite but relatively smaller effect. The obtained values of cumulants and their ratios with the Angantyr model, where the formation of thermalized medium is not assumed, can serve as a baseline for future measurements."
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Published on:
08 June 2020
Publisher:
APS
Published in:
Physical Review C , Volume 101 (2020)
Issue 6
DOI:
https://doi.org/10.1103/PhysRevC.101.064903
arXiv:
1909.12113
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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