Measurement of the branching ratio for the decay $K^\pm \to \pi^\pm \pi^0 \pi^0$ with the KLOE detector

TL;DR

This paper reports a precise measurement of the branching ratio for the decay $K^ o ^ ^0 ^0$ using the KLOE detector, based on a large sample of tagged charged kaon events at the DANE collider.

Contribution

The paper provides a new, more precise measurement of the absolute branching ratio for $K^ o ^ ^0 ^0$ decay, improving previous results with a large data sample.

Findings

BR($K^ o ^ ^0 ^0$) = (1.781 ± 0.013 stat ± 0.016 syst) %

Large sample of ~33 million tagged charged kaons used

Enhanced precision over previous measurements

Abstract

A new measurement of the absolute branching ratio BR($K^\pm \to \pi^\pm \pi^0 \pi^0$) with the KLOE detector at the DA$\Phi$NE $e^+e^-$ collider is presented, based on a sample of $\sim 3.3\times 10^7$ charged kaons tagged events, produced in the reaction $e^+e^-\to\phi\to K^+K^-$.The value BR($K^\pm \to \pi^\pm \pi^0 \pi^0$) $= (1.781\pm 0.013_{stat}\pm 0.016_{syst})%$ has been obtained.