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Investigating collective effects in small collision systems using PYTHIA8 and EPOS4 simulations

Danu, A. ; Brandibur, C. ; Dobrin, A. LU ; Manea, A. ; Basu, S. LU orcid ; Gonzalez, V. and Pruneau, C. (2025) 16th Workshop on Particle Correlations and Femtoscopy, WPCF 2023 and 4th Resonance Workshop In Nuovo Cimento della Societa Italiana di Fisica C 48.
Abstract

Measurements of azimuthal angular correlations of inclusive and identified particles from EPOS4 and PYTHIA8 event generators are used to study the unexpected collective behavior observed in small collision systems. In particular, anisotropic flow coefficients measured using two- and four-particle correlations and balance functions are reported in pp collisions at √s = 13.6 TeV. The second-order Fourier coefficient of π±, K±, p+p, Λ+Λ, K0S, and Ξ−+Ξ+ obtained using the scalar product method exhibits a mass ordering at low transverse momentum when a pseudorapidity gap of ∣Δη∣ > 2 is used, being more pronounced for EPOS4. The second harmonic two-particle cumulants of... (More)

Measurements of azimuthal angular correlations of inclusive and identified particles from EPOS4 and PYTHIA8 event generators are used to study the unexpected collective behavior observed in small collision systems. In particular, anisotropic flow coefficients measured using two- and four-particle correlations and balance functions are reported in pp collisions at √s = 13.6 TeV. The second-order Fourier coefficient of π±, K±, p+p, Λ+Λ, K0S, and Ξ−+Ξ+ obtained using the scalar product method exhibits a mass ordering at low transverse momentum when a pseudorapidity gap of ∣Δη∣ > 2 is used, being more pronounced for EPOS4. The second harmonic two-particle cumulants of inclusive charged particles decrease with charged-particle multiplicity and depend weakly on ∣Δη∣, while the second harmonic four-particle cumulants are consistent with zero. The balance functions show different responses, being influenced by the different charge production mechanisms.

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author
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Nuovo Cimento della Societa Italiana di Fisica C
series title
Nuovo Cimento della Societa Italiana di Fisica C
volume
48
edition
1
conference name
16th Workshop on Particle Correlations and Femtoscopy, WPCF 2023 and 4th Resonance Workshop
conference location
Catania, Italy
conference dates
2023-11-06 - 2023-11-10
external identifiers
  • scopus:85218690163
ISSN
2037-4909
DOI
10.1393/ncc/i2025-25021-6
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 Societa Italiana di Fisica. All rights reserved.
id
82f8a51d-7f0d-4a2b-82a3-a193316f9e0b
date added to LUP
2025-07-04 13:30:04
date last changed
2025-07-04 13:31:24
@inproceedings{82f8a51d-7f0d-4a2b-82a3-a193316f9e0b,
  abstract     = {{<p>Measurements of azimuthal angular correlations of inclusive and identified particles from EPOS4 and PYTHIA8 event generators are used to study the unexpected collective behavior observed in small collision systems. In particular, anisotropic flow coefficients measured using two- and four-particle correlations and balance functions are reported in pp collisions at √s = 13.6 TeV. The second-order Fourier coefficient of π<sup>±</sup>, K<sup>±</sup>, p+p, Λ+Λ, K<sup>0</sup><sub>S</sub>, and Ξ<sup>−</sup>+Ξ<sup>+</sup> obtained using the scalar product method exhibits a mass ordering at low transverse momentum when a pseudorapidity gap of ∣Δη∣ &gt; 2 is used, being more pronounced for EPOS4. The second harmonic two-particle cumulants of inclusive charged particles decrease with charged-particle multiplicity and depend weakly on ∣Δη∣, while the second harmonic four-particle cumulants are consistent with zero. The balance functions show different responses, being influenced by the different charge production mechanisms.</p>}},
  author       = {{Danu, A. and Brandibur, C. and Dobrin, A. and Manea, A. and Basu, S. and Gonzalez, V. and Pruneau, C.}},
  booktitle    = {{Nuovo Cimento della Societa Italiana di Fisica C}},
  issn         = {{2037-4909}},
  language     = {{eng}},
  series       = {{Nuovo Cimento della Societa Italiana di Fisica C}},
  title        = {{Investigating collective effects in small collision systems using PYTHIA8 and EPOS4 simulations}},
  url          = {{http://dx.doi.org/10.1393/ncc/i2025-25021-6}},
  doi          = {{10.1393/ncc/i2025-25021-6}},
  volume       = {{48}},
  year         = {{2025}},
}