Inclusive Λ production in proton-proton collisions at 3.5 GeV

Abstract

The inclusive production of Λ hyperons in proton-proton collisions at $\sqrt{s}$ = 3.18 GeV was measured with HADES at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt. The experimental data are compared to a data-based model for individual exclusive Λ production channels in the same reaction. The contributions of intermediate resonances such as Σ(1385), Δ++ or N* are considered in detail. In particular, the result of a partial wave analysis is accounted for the abundant pK${}^{+}$Λ final state. Model and data show a reasonable agreement at mid rapidities, while a difference is found for larger rapidities. A total Λ production cross section in p+p collisions at $\sqrt{s}$ = 3.18 GeV of σ(pp $\to$ Λ + X) = 207.3 $\pm$ 1.3 +6.0 -7.3 (stat.) $\pm$ 8.4 (syst.) +0.4 -0.5 (model) μb is found.

arXiv comment12 pages, 6 figures

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• Strangeness production via resonances in heavy-ion collisions at SIS energies
• The role of the triangle singularity in $\Lambda (1405)$ production in the ${\pi }^{-}p\to K^0\pi \Sigma$ and $pp\to p{K}^{+}\pi \Sigma$ processes
• Rise and fall of $\Lambda$ and $\bar{\Lambda }$ global polarization in semi-central heavy-ion collisions at HADES, NICA and RHIC energies from the core-corona model
• ${\Sigma }^0$ production in proton nucleus collisions near threshold
• Medium effects in $\Lambda K^{+}$ pair production by 2.83 GeV protons on nuclei
• A new review of excitation functions of hadron production in $pp$ collisions in the NICA energy range