New results from the NA48/2 experiment at CERN SPS: radiative nonleptonic kaon decays

TL;DR

This paper reports precise measurements of rare radiative nonleptonic kaon decays from the NA48/2 experiment at CERN SPS, providing new data on branching fractions and decay characteristics.

Contribution

It presents new, precise experimental results on rare kaon decay modes, improving understanding of these processes and testing theoretical models.

Findings

Measured branching fractions with high precision

Analyzed decay characteristics of rare kaon modes

Reduced background contamination in decay samples

Abstract

The NA48/2 experiment at the CERN SPS carried out data taking in 2003 and 2004. Analysis of the selected data samples of 7,146 $K^\pm\to\pi^\pm e^+e^-$ decay candidates with 0.6% background, 1,164 $K^\pm\to\pi^\pm\gamma\gamma$ candidates with 3.3% background, and 120 $K^\pm\to\pi^\pm\gamma e^+e^-$ candidates with 6.1% background allowed precise measurements of branching fractions and other characteristics of these rare kaon decays.