Measurements of Ξ (1530) and Ξ ¯ (1530) production in proton–proton interactions at √sNN = 17.3 GeV in the NA61/SHINE experiment

Abstract

Double-differential yields of Ξ(1530)0Ξ(1530)0 and Ξ¯¯¯¯(1530)0Ξ¯(1530)0 resonances produced in p+p interactions were measured at a laboratory beam momentum of 158 GeV /c GeV /c. This measurement is the first of its kind in p+p interactions below LHC energies. It was performed at the CERN SPS by the NA61/SHINE collaboration. Double-differential distributions in rapidity and transverse momentum were obtained from a sample of 26×10626×106 inelastic events. The spectra are extrapolated to full phase space resulting in mean multiplicity of Ξ(1530)0Ξ(1530)0 (6.73±0.25±0.67)×10−46.73±0.25±0.67)×10−4 and Ξ¯¯¯¯(1530)0Ξ¯(1530)0 (2.71±0.18±0.18)×10−42.71±0.18±0.18)×10−4. The rapidity and transverse momentum spectra and mean multiplicities were compared to predictions of string-hadronic and statistical model calculations.