$K^-d\rightarrow\pi\Lambda N$ reaction with in-flight kaons for studying the $\Lambda N$ interaction

TL;DR

This study calculates $ ext{Lambda}N$ invariant mass spectra for specific reactions involving in-flight kaons to investigate isospin symmetry breaking and differences in scattering parameters between $ ext{Lambda}p$ and $ ext{Lambda}n$ systems at low energies.

Contribution

It introduces a method to extract isospin symmetry breaking effects from $ ext{Lambda}N$ spectra using in-flight kaon reactions with partial wave analysis.

Findings

Isospin symmetry breaking can be observed from spectral differences.

Kinematic selection effectively suppresses background processes.

The approach enables study of low-energy $ ext{Lambda}N$ interactions.

Abstract

The $\Lambda N$ invariant mass spectra for the reactions $K^-d\rightarrow\pi^-\Lambda p$ and $K^-d\rightarrow\pi^0\Lambda n$ are calculated for experimental study of isospin symmetry breaking in the $\Lambda N$ scattering at low energies, the difference in the scattering lengths and effective ranges of $\Lambda p$ and $\Lambda n$ systems. The calculations are performed for in-flight kaons with a momentum of 1000 MeV/c with employing partial wave analysis up to the p-wave for meson-baryon amplitudes and the spin-flip term for baryon-baryon amplitudes. Kinematic selection is utilized to suppress the background processes by selecting forward-emitting pions and higher momentum nucleons. It is worth noting that isospin symmetry breaking in the $\Lambda N$ system can be extracted from the difference of the $\Lambda N$ invariant mass spectra between the $K^-d\rightarrow\pi^-\Lambda p$ and $K^-d\rightarrow\pi^0\Lambda n$ reactions.