Measurement of Gamma(Ks -> pi+pi-gamma)/Gamma(Ks -> pi0pi0)

TL;DR

This paper reports a precise measurement of the ratio of decay widths for K-short mesons decaying into pi+pi-gamma versus pi0pi0, using the KLOE detector, with high statistical accuracy and systematic uncertainty analysis.

Contribution

The study provides a highly accurate, fully inclusive measurement of the decay ratio, improving precision in kaon decay data and reducing systematic uncertainties.

Findings

Measured ratio R=2.236 +/- 0.003(stat) +/- 0.015(syst)

Achieved statistical error as low as 0.1%

Systematic uncertainties primarily from data-driven estimates

Abstract

We have measured the ratio R=Gamma(Ks -> pi+pi-gamma)/Gamma(Ks -> pi0pi0) with the KLOE detector at the DAFNE e+e- collider. This measurement is fully inclusive with respect to the pi+pi-gamma final state. The sample of over 10^6 two-pion decays of tagged Ks mesons allows a statistical error as low as 0.1% to be obtained. The accuracy is limited by systematic uncertainties, which are estimated primarily from data. We find R=2.236 +/- 0.003(stat) +/- 0.015(syst).