High resolution study of the Lambda p final state interaction in the reaction p + p -> K+ + (Lambda p)

TL;DR

This study provides a high-resolution analysis of the Lambda p final state interaction in proton-proton collisions, revealing detailed scattering parameters through experimental data and theoretical modeling.

Contribution

It introduces a precise measurement of the Lambda p interaction at a specific energy, applying the Jost-function approach to extract scattering lengths and effective ranges.

Findings

Observation of a large final state enhancement near the Lambda p threshold

Determination of singlet and triplet scattering lengths and effective ranges

Validation of the Jost-function approach for describing the interaction

Abstract

The reaction pp -> K+ + (Lambda p) was measured at Tp=1.953 GeV and Theta = 0 deg with a high missing mass resolution in order to study the Lambda p final state interaction. The large final state enhancement near the Lambda p threshold can be described using the standard Jost-function approach. The singlet and triplet scattering lengths and effective ranges are deduced by fitting simultaneously the Lambda p invariant mass spectrum and the total cross section data of the free Lambda p scattering.