Partial-wave analysis of $\bar K N$ scattering reactions

TL;DR

This paper performs a detailed partial-wave analysis of antikaon-nucleon scattering reactions within a specific energy range, providing precise amplitude extractions constrained by a multichannel model.

Contribution

It introduces a multichannel energy-dependent model that enforces unitarity, enabling accurate analysis of multiple scattering reactions involving antikaons and nucleons.

Findings

Excellent predictions of differential cross sections

Accurate polarization measurements

Consistent cross section calculations

Abstract

We investigate the two-body reactions $\bar K N\rightarrow \bar K N$, $\bar K N\rightarrow \pi \Lambda$, and $\bar K N\rightarrow \pi \Sigma$ via single-energy partial-wave analyses in the c.m.\ energy range 1480 to 2100 MeV. The partial-wave amplitudes for these reactions thus extracted were constrained by a multichannel energy-dependent model satisfying unitarity of the partial-wave $S$-matrix. We obtain excellent predictions of differential cross sections, polarizations, polarized cross sections, and cross sections for these reactions from a global energy-dependent solution.