Cusps in K --> 3pi decays: a theoretical framework
Juerg Gasser, Bastian Kubis, Akaki Rusetsky
TL;DR
This paper discusses a theoretical framework used in analyzing K to 3pi decays, which is crucial for extracting precise pi-pi scattering lengths from experimental data.
Contribution
It provides a detailed description of a theoretical approach employed in the analysis of K to 3pi decay data, aiding in the precise determination of scattering lengths.
Findings
Clarifies the theoretical framework for cusp analysis in K decays
Supports high-precision extraction of pi-pi scattering lengths
Enhances understanding of decay dynamics and scattering processes
Abstract
Based on the analysis of 6.031*10^7 K+- --> pi0 pi0 pi+- decays, the NA48/2 collaboration has recently determined the S-wave pi-pi scattering lengths a_0-a_2 with high precision. In addition, the scattering length a_2 has been independently measured, although less precisely so. The present article discusses in detail one of the theoretical frameworks used in the data analysis.
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