Precise measurement of Gamma(Ks->pi+pi-(gamma))/Gamma(Ks->pi0pi0) with the KLOE detector at DAFNE

TL;DR

This paper reports a highly precise measurement of the ratio of decay widths for K-short mesons into charged and neutral pion pairs using the KLOE detector at DAFNE, significantly improving the accuracy over previous results.

Contribution

The study provides the most precise measurement to date of the decay width ratio, reducing the total error by a factor of three compared to earlier KLOE results.

Findings

Measured ratio R=2.2555±0.0054 with improved precision.

Results agree with previous measurements, confirming consistency.

Reduced the total error to 0.25%, enhancing the accuracy of kaon decay data.

Abstract

Using a sample of over 400 million phi->KsKl decays produced during the years 2001 and 2002 at the DAFNE e+e- collider, the ratio R=Gamma(Ks->pi+pi-(g))/Gamma(Ks->pi0pi0) has been measured with the KLOE detector. The result is R=2.2555+-0.0012(stat)+-0.0021(syst-stat)+-0.0050(syst), which is in good agreement with the previously published result based on the KLOE data sample from the year 2000. The average of the KLOE results is R=2.2549+-0.0054, reducing the total error by a factor of three, to 0.25%.