HYPERON-NUCLEON INTERACTIONS IN THE pp→K⁺Λp REACTION

Abstract

We present calculations of the invariant mass spectra of the Λp system for the exclusive pp → K + Λp reaction with the aim of studying the final state interaction between the Λ-hyperon and the proton. The reaction is described within a meson exchange framework and the final state Λp interaction is incorporated through an off-shell t-matrix for the Λp → Λp scattering, constructed using the available hyperon-nucleon (YN) potentials. The cross sections are found to be sensitive to the type of YN potential used especially at the Λ and Σ production thresholds. Hence, data on this exclusive reaction, which can be used to constrain the YN potentials are desirable.

Close-to-threshold meson production in hadronic interactions

“…considering direct kaon emission as well as π and K exchange (figs. 33ab) and using an off-shell T matrix description for the hyperon-nucleon interaction the sensitivity on the microscopic hyperon-nucleon potential used has been studied in detail by Kelkar and Jain [325] for Λ production in comparison to the inclusive SATURNE data from [326]. The authors conclude, that -in order to separate different channels contributing at the ΣN threshold -i) exclusive 26 The total πp → KY cross section is in the range of 1 mb compared to 10 mb for K + p scattering (see fig.…”

Hyperon production in near-threshold nucleon-nucleon collisions

“…Therefore, the new set of data are expected to probe also the hyperon-nucleon and hyperon-strange meson interactions (see, e.g., Refs. [8][9][10]). …”

Analysis of the $\Lambda p$ final-state interaction in the reaction $p + p\to K^ + (\Lambda p)$

“…Exclusive measurements of the pp→K + Λp reaction were performed at COSY [14,15] and SATURNE [16]. Theoretical analyses of the reactions were done [26,27,28,29,30,31,32,33,34,35,36,37,38,39] by applying the meson exchange model and including the Λp FSI generally modelled by Nijmegen or Jülich potentials.…”