Σ+ production in pp collisions at s=13 TeV


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Zurlo N., Zugravel S., Zingaretti A., Zhu Y., Zhu S., Zhu J., ...More

European Physical Journal C, vol.86, no.2, 2026 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 86 Issue: 2
  • Publication Date: 2026
  • Doi Number: 10.1140/epjc/s10052-025-15095-9
  • Journal Name: European Physical Journal C
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC, zbMATH, Directory of Open Access Journals, Nature Index
  • Yıldız Technical University Affiliated: Yes

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.