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Measurement of the p–Σ+ correlation function in pp collisions at s=13 TeV

Abualrob, I.J. ; Christiansen, T. 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 Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 874.
Abstract
In this letter, the first measurement of the femtoscopic correlation of protons and Σ+ hyperons is presented and used to study the p–Σ+ interaction. The measurement is performed with the ALICE detector in high-multiplicity triggered pp collisions at s=13 TeV. The Σ+ hyperons are reconstructed using a missing-mass approach in the decay channel to p+π0 with π0→γγ, while both Σ+ and protons are identified using a machine learning approach. These techniques result in a high reconstruction efficiency and purity, which allows the measurement of the p–Σ+ correlation function for the first time. Thanks to the high significance achieved in the p–Σ+ correlation signal, it is possible to discriminate between the predictions of different models of the... (More)
In this letter, the first measurement of the femtoscopic correlation of protons and Σ+ hyperons is presented and used to study the p–Σ+ interaction. The measurement is performed with the ALICE detector in high-multiplicity triggered pp collisions at s=13 TeV. The Σ+ hyperons are reconstructed using a missing-mass approach in the decay channel to p+π0 with π0→γγ, while both Σ+ and protons are identified using a machine learning approach. These techniques result in a high reconstruction efficiency and purity, which allows the measurement of the p–Σ+ correlation function for the first time. Thanks to the high significance achieved in the p–Σ+ correlation signal, it is possible to discriminate between the predictions of different models of the N–Σ interaction and to accomplish a first determination of the p–Σ+ scattering parameters. Copyright © 2026. Published by Elsevier B.V. (Less)
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Femtoscopy, Hyperon-nucleon interaction, Strangeness, Strong interaction
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
874
article number
140252
publisher
Elsevier
external identifiers
  • scopus:105031796401
ISSN
0370-2693
DOI
10.1016/j.physletb.2026.140252
language
English
LU publication?
yes
id
bfcc9cec-40fd-46c4-a431-6377c147e31c
date added to LUP
2026-04-02 15:36:47
date last changed
2026-04-02 15:37:30
@article{bfcc9cec-40fd-46c4-a431-6377c147e31c,
  abstract     = {{In this letter, the first measurement of the femtoscopic correlation of protons and Σ+ hyperons is presented and used to study the p–Σ+ interaction. The measurement is performed with the ALICE detector in high-multiplicity triggered pp collisions at s=13 TeV. The Σ+ hyperons are reconstructed using a missing-mass approach in the decay channel to p+π0 with π0→γγ, while both Σ+ and protons are identified using a machine learning approach. These techniques result in a high reconstruction efficiency and purity, which allows the measurement of the p–Σ+ correlation function for the first time. Thanks to the high significance achieved in the p–Σ+ correlation signal, it is possible to discriminate between the predictions of different models of the N–Σ interaction and to accomplish a first determination of the p–Σ+ scattering parameters. Copyright © 2026. Published by Elsevier B.V.}},
  author       = {{Abualrob, I.J. and Christiansen, T. 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         = {{0370-2693}},
  keywords     = {{Femtoscopy; Hyperon-nucleon interaction; Strangeness; Strong interaction}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Measurement of the p–Σ+ correlation function in pp collisions at s=13 TeV}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2026.140252}},
  doi          = {{10.1016/j.physletb.2026.140252}},
  volume       = {{874}},
  year         = {{2026}},
}