Σ ̄± production in pp and p-Pb collisions at √sNN = 5.02 TeV with ALICE

The transverse momentum spectra and integrated yields of anti- Σ Σ hyperons ( Σ ̄± Σ ¯ ± ) have been measured in pp pp and p-Pb p - Pb collisions at √sNN=5.02 s NN = 5.02 TeV with the ALICE experiment. Measurements are performed via the newly accessed decay channel Σ ̄± \!\!→ n̄ π ± Σ ¯ ± → n ¯ π ± . A new method of antineutron reconstruction with the PHOS electromagnetic spectrometer is developed and applied to this analysis. The pT p T spectra of Σ ̄± Σ ¯ ± are measured in the range 0.5<pT <3 0.5 < p T < 3 GeV/ c c and compared to predictions of the PYTHIA 8, DPMJET, PHOJET, EPOS LHC and EPOS4 models. The EPOS LHC and EPOS4 models provide the best descriptions of the measured spectra both in pp pp and p-Pb p - Pb collisions, while models which do not account for multiparton interactions provide a considerably worse description at high pT p T . The total yields of Σ ̄± Σ ¯ ± in both