Measurements of $\Xi\left(1530\right)^{0}$ and $\overline{\Xi}\left(1530\right)^{0}$ production in proton-proton interactions at $\sqrt{s_{NN}}$ = 17.3 GeV in the NA61/SHINE experiment

TL;DR

This paper reports the first measurements of $ ext{Xi}(1530)^0$ and $ar{ ext{Xi}}(1530)^0$ resonance production in proton-proton collisions at 17.3 GeV, providing new data for understanding hadron production at SPS energies.

Contribution

It provides the first double-differential yields of these resonances in pp interactions below LHC energies, with detailed spectra and mean multiplicities.

Findings

Measured mean multiplicities: $ ext{Xi}(1530)^0$ and $ar{ ext{Xi}}(1530)^0$

Compared spectra with string-hadronic and statistical models

First such measurement at SPS energies

Abstract

Double-differential yields of $\Xi\left(1530\right)^{0}$ and $\overline{\Xi}\left(1530\right)^{0}$ 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 $\Xi\left(1530\right)^{0}$ (6.73 $\pm$ 0.25 $\pm$ 0.67)$\times10^{-4}$ and $\overline{\Xi}\left(1530\right)^{0}$ (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.