Centrifugal-Barrier Effects and Determination of the Interaction Radius

TL;DR

This paper proposes a new method to measure the interaction radius of resonances by analyzing centrifugal barrier effects in physics analysis, addressing a longstanding challenge in resonance structure characterization.

Contribution

The paper introduces a novel approach to determine the interaction radius of resonances using partial wave analysis, emphasizing the impact of centrifugal barrier effects.

Findings

Centrifugal barrier effects significantly influence PWA fit results.

Interaction radius can be reliably measured for some resonances.

The method improves understanding of resonance structures.

Abstract

The interaction radius of a resonance is an important physical quantity to describe the structure of a resonance. But, for a long time, physicists do not find a reliable way to measure the magnitude of the interaction radius of a resonance. In this paper, a method is proposed to measure the interaction radius in physics analysis. It is found that the centrifugal barrier effects have great influence to physical results obtained in the PWA fit, and the interaction radius of some resonances can be well measured in the fit.