Measurements of Ξ15300 and Ξ¯15300 production in proton–proton interactions at sNN = 17.3 GeV in the NA61/SHINE experiment

Double-differential yields of Ξ 1530 0 and Ξ ¯ 1530 0 resonances produced in p+p interactions were measured at a laboratory beam momentum of 158 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 × 10 6 inelastic events. The spectra are extrapolated to full phase space resulting in mean multiplicity of Ξ 1530 0 ( 6.73 ± 0.25 ± 0.67 ) × 10 - 4 and Ξ ¯ 1530 0 ( 2.71 ± 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.