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Σ+ production in pp collisions at s=13 TeV

Abualrob, I.J. ; Christiansen, P. LU ; Hansen, J. LU orcid ; Iversen, K.E. LU orcid ; Nepeivoda, R. LU orcid ; Ohlson, A. LU ; Panasenko, I. LU ; Silvermyr, D. LU orcid ; Staa, J. LU and Zurlo, N. (2026) In European Physical Journal C 86(2).
Abstract
The measurement of Σ+ production in pp collisions at s=13 TeV is presented. The measurement is performed at midrapidity in both minimum-bias and high-multiplicity pp collisions at s=13 TeV. The Σ+ is reconstructed via its weak-decay topology in the decay channel Σ+→p+π0 with π0→γ+γ. In a novel approach, the neutral pion is reconstructed by combining photons that convert in the detector material with photons measured in the calorimeters. The transverse-momentum (pT) distributions of the Σ+ and its rapidity densities dN/dy in both event classes are reported. The pT spectrum in minimum-bias collisions is compared to QCD-inspired event generators. The ratio of Σ+ to previously measured Λ baryons is in good agreement with calculations from the... (More)
The measurement of Σ+ production in pp collisions at s=13 TeV is presented. The measurement is performed at midrapidity in both minimum-bias and high-multiplicity pp collisions at s=13 TeV. The Σ+ is reconstructed via its weak-decay topology in the decay channel Σ+→p+π0 with π0→γ+γ. In a novel approach, the neutral pion is reconstructed by combining photons that convert in the detector material with photons measured in the calorimeters. The transverse-momentum (pT) distributions of the Σ+ and its rapidity densities dN/dy in both event classes are reported. The pT spectrum in minimum-bias collisions is compared to QCD-inspired event generators. The ratio of Σ+ to previously measured Λ baryons is in good agreement with calculations from the Statistical Hadronization Model. The high efficiency and purity of the novel reconstruction method for Σ+ presented here will enable future studies of the interaction of Σ+ with protons in the context of femtoscopic measurements, which could be crucial for understanding the equation of state of neutron stars. © CERN for the benefit of the ALICE Collaboration 2026. (Less)
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author collaboration
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Equations of state, Hadrons, Inelastic scattering, Stars, Tellurium compounds, Decay channels, Decay topology, Detector materials, Event class, High multiplicity, Measurements of, Mid-rapidity, Neutral pions, Spectra's, Transverse momenta, Photons
in
European Physical Journal C
volume
86
issue
2
article number
101
publisher
Springer Nature
external identifiers
  • scopus:105032054692
ISSN
1434-6044
DOI
10.1140/epjc/s10052-025-15095-9
language
English
LU publication?
yes
id
084fa508-1cee-4a64-bf66-5f500c58220e
date added to LUP
2026-04-02 10:01:46
date last changed
2026-04-02 10:02:37
@article{084fa508-1cee-4a64-bf66-5f500c58220e,
  abstract     = {{The measurement of Σ+ production in pp collisions at s=13 TeV is presented. The measurement is performed at midrapidity in both minimum-bias and high-multiplicity pp collisions at s=13 TeV. The Σ+ is reconstructed via its weak-decay topology in the decay channel Σ+→p+π0 with π0→γ+γ. In a novel approach, the neutral pion is reconstructed by combining photons that convert in the detector material with photons measured in the calorimeters. The transverse-momentum (pT) distributions of the Σ+ and its rapidity densities dN/dy in both event classes are reported. The pT spectrum in minimum-bias collisions is compared to QCD-inspired event generators. The ratio of Σ+ to previously measured Λ baryons is in good agreement with calculations from the Statistical Hadronization Model. The high efficiency and purity of the novel reconstruction method for Σ+ presented here will enable future studies of the interaction of Σ+ with protons in the context of femtoscopic measurements, which could be crucial for understanding the equation of state of neutron stars. © CERN for the benefit of the ALICE Collaboration 2026.}},
  author       = {{Abualrob, I.J. and Christiansen, P. and Hansen, J. and Iversen, K.E. and Nepeivoda, R. and Ohlson, A. and Panasenko, I. and Silvermyr, D. and Staa, J. and Zurlo, N.}},
  issn         = {{1434-6044}},
  keywords     = {{Equations of state; Hadrons; Inelastic scattering; Stars; Tellurium compounds; Decay channels; Decay topology; Detector materials; Event class; High multiplicity; Measurements of; Mid-rapidity; Neutral pions; Spectra's; Transverse momenta; Photons}},
  language     = {{eng}},
  number       = {{2}},
  publisher    = {{Springer Nature}},
  series       = {{European Physical Journal C}},
  title        = {{Σ+ production in pp collisions at s=13 TeV}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-025-15095-9}},
  doi          = {{10.1140/epjc/s10052-025-15095-9}},
  volume       = {{86}},
  year         = {{2026}},
}