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., ...Daha Fazla

European Physical Journal C, cilt.86, sa.2, 2026 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 86 Sayı: 2
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1140/epjc/s10052-025-15095-9
  • Dergi Adı: European Physical Journal C
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC, zbMATH, Directory of Open Access Journals, Nature Index
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

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.