Meson spectroscopy with unitary coupled-channels model for heavy-meson decay into three mesons

TL;DR

This paper introduces a unitary coupled-channels model for heavy-meson decay into three mesons, emphasizing the importance of three-body unitarity in accurately extracting meson properties from experimental data.

Contribution

It develops a novel model that maintains three-body unitarity, improving the analysis of excited meson decays compared to traditional isobar models.

Findings

Significant differences in meson properties extracted by unitary vs. isobar models.

Three-body unitarity impacts the accuracy of mass, width, and coupling strength determinations.

The model provides a more reliable framework for meson spectroscopy analysis.

Abstract

We develop a model for describing excited mesons decay into three mesons. The properties of the excited mesons can be extracted with this model. The model maintains the three-body unitarity that has been missed in previous data analyses based on the conventional isobar models. We study an importance of the three-body unitarity in extracting hadron properties from data. For this purpose, we use the unitary and isobar models to analyze the same pseudo data of gamma p -> pi+pi+pi-n, and extract the properties of excited mesons. We find a significant difference between the unitary and isobar models in the extracted properties of excited mesons, such as the mass, width and coupling strength to decay channels.