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Light-flavor particle production in high-multiplicity pp collisions at s= 13 TeV as a function of transverse spherocity

Acharya, S. ; Basu, S. LU orcid ; Christiansen, P. LU ; Hansen, J. LU orcid ; Iversen, K.E. LU orcid ; Matonoha, O. LU ; Nepeivoda, R. LU orcid ; Ohlson, A. LU ; Silvermyr, D. LU orcid and Staa, J. LU , et al. (2024) In Journal of High Energy Physics 2024(5).
Abstract
Results on the transverse spherocity dependence of light-flavor particle production (π, K, p, ϕ, K*0, KS0, Λ, Ξ) at midrapidity in high-multiplicity pp collisions at s = 13 TeV were obtained with the ALICE apparatus. The transverse spherocity estimator SOp categorizes events by their azimuthal topology. Utilizing narrow selections on SOp, it is possible to contrast particle production in collisions dominated by many soft initial interactions with that observed in collisions dominated by one or more hard scatterings. Results are reported for two multiplicity estimators covering different pseudorapidity regions. The SOp estimator is found to effectively constrain the hardness of the events when the midrapidity (|η| < 0.8) estimator is... (More)
Results on the transverse spherocity dependence of light-flavor particle production (π, K, p, ϕ, K*0, KS0, Λ, Ξ) at midrapidity in high-multiplicity pp collisions at s = 13 TeV were obtained with the ALICE apparatus. The transverse spherocity estimator SOp categorizes events by their azimuthal topology. Utilizing narrow selections on SOp, it is possible to contrast particle production in collisions dominated by many soft initial interactions with that observed in collisions dominated by one or more hard scatterings. Results are reported for two multiplicity estimators covering different pseudorapidity regions. The SOp estimator is found to effectively constrain the hardness of the events when the midrapidity (|η| < 0.8) estimator is used. The production rates of strange particles are found to be slightly higher for soft isotropic topologies, and severely suppressed in hard jet-like topologies. These effects are more pronounced for hadrons with larger mass and strangeness content, and observed when the topological selection is done within a narrow multiplicity interval. This demonstrates that an important aspect of the universal scaling of strangeness enhancement with final-state multiplicity is that high-multiplicity collisions are dominated by soft, isotropic processes. On the contrary, strangeness production in events with jet-like processes is significantly reduced. The results presented in this article are compared with several QCD-inspired Monte Carlo event generators. Models that incorporate a two-component phenomenology, either through mechanisms accounting for string density, or thermal production, are able to describe the observed strangeness enhancement as a function of SOp. © The Author(s) 2024. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
Hadron-Hadron Scattering, Particle and Resonance Production
in
Journal of High Energy Physics
volume
2024
issue
5
article number
184
publisher
Springer
external identifiers
  • scopus:85205866085
ISSN
1029-8479
DOI
10.1007/JHEP05(2024)184
language
English
LU publication?
yes
id
78016b4f-d218-4dfe-bde5-c59450393b28
date added to LUP
2025-12-11 07:59:10
date last changed
2025-12-11 07:59:10
@article{78016b4f-d218-4dfe-bde5-c59450393b28,
  abstract     = {{Results on the transverse spherocity dependence of light-flavor particle production (π, K, p, ϕ, K*0, KS0, Λ, Ξ) at midrapidity in high-multiplicity pp collisions at s = 13 TeV were obtained with the ALICE apparatus. The transverse spherocity estimator SOp categorizes events by their azimuthal topology. Utilizing narrow selections on SOp, it is possible to contrast particle production in collisions dominated by many soft initial interactions with that observed in collisions dominated by one or more hard scatterings. Results are reported for two multiplicity estimators covering different pseudorapidity regions. The SOp estimator is found to effectively constrain the hardness of the events when the midrapidity (|η| &lt; 0.8) estimator is used. The production rates of strange particles are found to be slightly higher for soft isotropic topologies, and severely suppressed in hard jet-like topologies. These effects are more pronounced for hadrons with larger mass and strangeness content, and observed when the topological selection is done within a narrow multiplicity interval. This demonstrates that an important aspect of the universal scaling of strangeness enhancement with final-state multiplicity is that high-multiplicity collisions are dominated by soft, isotropic processes. On the contrary, strangeness production in events with jet-like processes is significantly reduced. The results presented in this article are compared with several QCD-inspired Monte Carlo event generators. Models that incorporate a two-component phenomenology, either through mechanisms accounting for string density, or thermal production, are able to describe the observed strangeness enhancement as a function of SOp. © The Author(s) 2024.}},
  author       = {{Acharya, S. and Basu, S. and Christiansen, P. and Hansen, J. and Iversen, K.E. and Matonoha, O. and Nepeivoda, R. and Ohlson, A. and Silvermyr, D. and Staa, J. and Vislavicius, V. and Zugravel, S.C. and Zurlo, N.}},
  issn         = {{1029-8479}},
  keywords     = {{Hadron-Hadron Scattering; Particle and Resonance Production}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Light-flavor particle production in high-multiplicity pp collisions at s= 13 TeV as a function of transverse spherocity}},
  url          = {{http://dx.doi.org/10.1007/JHEP05(2024)184}},
  doi          = {{10.1007/JHEP05(2024)184}},
  volume       = {{2024}},
  year         = {{2024}},
}