Eur Phys J C (2004) 33: s337-s339
https://doi.org/10.1140/epjcd/s2004-03-1635-2

PS03 CP Violation

Search for CP-violation in K_S → 3 π ⁰ decays with the NA48 detector

INFN, Turin, Italy

Received: 13 October 2003
Accepted: 6 January 2004
Published online: 6 February 2004

Abstract

The decay K_S → 3 π ⁰ is forbidden by CP conservation. Using a sample of more than 6 million K → 3 π ⁰ decays, the NA48 Collaboration has improved the limit on η ₀₀₀ = A(K_S → 3 π ⁰)/A(K_L → 3 π ⁰) and on the branching ratio Br(K_S → 3 π ⁰) by about one order of magnitude. Using this result and the Bell-Steinberger relation, a new limit on the equality of the K⁰ and masses is obtained improving by about 40% the test of CPT conservation in the mixing of neutral kaons.