Production of $\Lambda$ hyperons in inelastic p+p interactions at 158 GeV/$c$

TL;DR

This paper reports measurements of $\Lambda$ hyperon production in inelastic proton-proton collisions at 158 GeV/c, providing spectra and distributions, and comparing results with existing models.

Contribution

First detailed spectra and distributions of $\Lambda$ hyperons in p+p interactions at this energy, with comparison to theoretical models.

Findings

Mean multiplicity of $\Lambda$ hyperons is approximately 0.12.

Spectra of transverse momentum and rapidity are presented.

Results are consistent with some model predictions.

Abstract

Inclusive production of $\Lambda$-hyperons was measured with the large acceptance NA61/SHINE spectrometer at the CERN SPS in inelastic p+p interactions at beam momentum of 158~\GeVc. Spectra of transverse momentum and transverse mass as well as distributions of rapidity and x$_{_F}$ are presented. The mean multiplicity was estimated to be $0.120\,\pm0.006\;(stat.)\,\pm 0.010\;(sys.)$. The results are compared with previous measurements and predictions of the EPOS, UrQMD and FRITIOF models.