Double-differential yields of $Xileft(1530right)^{0}$ and $overline{Xi}left(1530right)^{0}$ resonances produced in pp interactions were measured at a laboratory beam momentum of 158~GeVc. This measurement is the first of its kind in pp interactions below LHC energies. It was performed at the CERN SPS by the NASixtyOne collaboration. Double-differential distributions in rapidity and transverse momentum were obtained from a sample of 26$cdot$10$^6$ inelastic events. The spectra are extrapolated to full phase space resulting in mean multiplicity of $Xileft(1530right)^{0}$ (6.73 $pm$ 0.25 $pm$ 0.67)$times10^{-4}$ and $overline{Xi}left(1530right)^{0}$ (2.71 $pm$ 0.18 $pm$ 0.18)$times10^{-4}$. The rapidity and transverse momentum spectra and mean multiplicities were compared to predictions of string-hadronic and statistical model calculations.
Download