Improved constraints on chiral SU(3) dynamics from kaonic hydrogen

TL;DR

This paper refines the understanding of K^- - proton interactions near threshold by integrating new high-precision kaonic hydrogen data with advanced coupled-channels analysis based on chiral SU(3) effective theory.

Contribution

It provides an improved, more accurate determination of the K^- p scattering length using updated experimental data and sophisticated theoretical modeling.

Findings

More precise K^- p scattering length estimates

Enhanced understanding of coupled-channels dynamics

Reduced uncertainties in chiral SU(3) interaction parameters

Abstract

A new improved study of K^- - proton interactions near threshold is performed using coupled-channels dynamics based on the next-to-leading order chiral SU(3) meson-baryon effective Lagrangian. Accurate constraints are now provided by new high-precision kaonic hydrogen measurements. Together with threshold branching ratios and scattering data, these constraints permit an updated analysis of the complex barK N and pi Sigma coupled-channels amplitudes and an improved determination of the K^- p scattering length, including uncertainty estimates.