$$\Sigma ^{+}$$ production in pp collisions at $$\sqrt{\textit{s}}=13$$ TeV

The measurement of + production in pp col- lisions 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 + is recon- structed via its weak-decay topology in the decay channel + → p + π0 with π0 → γ + γ. In a novel approach, the neutral pion is reconstructed by combining photons that con- vert in the detector material with photons measured in the calorimeters. The transverse-momentum (pT) distributions of the + and its rapidity densities dN /dy in both event classes are reported. The pT spectrum in minimum-bias col- lisions is compared to QCD-inspired event generators. The ratio of + to previously measured baryons is in good agreement with calculations from the Statistical Hadroniza- tion Model. The high efficiency and purity of the novel recon- struction method for + presented here will enable future studies of the interaction of + with protons in the context of femtoscopic measurements, which could be crucial for understanding the equation of state of neutron stars.