Double-strangeness production in $\Lambda p\to K^+X$ reaction

TL;DR

This paper investigates the production of double-strangeness in $ ext{Lambda} p$ reactions using an effective Lagrangian approach, focusing on the potential observation of the $H$-dibaryon and its interference effects.

Contribution

It introduces a model to analyze $S=-2$ production in $ ext{Lambda} p$ reactions, considering specific decay channels of the $H$-dibaryon and exploring interference patterns.

Findings

Total cross-sections are a few microbarns up to 5 GeV/c beam momentum.

The model allows direct access to interference effects between $H$-dibaryon and non-resonant contributions.

Predicted decay widths and reaction channels for the $H$-dibaryon.

Abstract

We investigate $S=-2$ production from the $\Lambda p\to K^+X$ reactions within the effective Lagrangian approach. The $\Lambda p\to K^+\Lambda\Lambda$ and $\Lambda p\to K^+\Xi^-p$ reactions are considered to find the lightest $S=-2$ system, which is $H$-dibaryon. We assume that the $H(2250)\to\Lambda\Lambda$, and $H(2270)\to\Xi^-p$ decays with the intrinsic decay width of 1 MeV. According to our calculations, the total cross-sections for $\Lambda p\to K^+\Lambda\Lambda$ and $\Lambda p\to K^+\Xi^-p$ reactions were found to be of the order of a few $\mu$b in the $\Lambda$ beam momentum range of up to 5 GeV$/c$. Furthermore, the direct access of information regarding the interference patterns between the $H$-dibaryon and non-resonant contributions was demonstrated.