New Results in Kaon Physics from NA48 and KTEV

TL;DR

Recent results from NA48 and KTeV experiments have advanced the understanding of kaon decays, including measurements of direct CP violation and rare decay modes, with new high-intensity data from NA48.

Contribution

This paper reports new measurements of Re(epsilon'/epsilon) and rare kaon decay modes, along with initial results from high-intensity K_S runs, providing updated insights into kaon physics.

Findings

Improved measurement of Re(epsilon'/epsilon).

New results on rare and very rare K_L decays.

Initial findings from high-intensity K_S runs.

Abstract

In the recent year many new results from kaon decays have been reported from both the NA48 experiment at CERN and the KTeV experiment at Fermilab. Both experiments have new and improved measurements of the parameter Re(epsilon'/epsilon) of direct CP violation in the neutral kaon system. Also several new results on rare and very rare K_L decays were reported. In addition, the NA48 collaboration has performed special high-intensity K_S run periods, with the first results now being available.