A measurement of the CP-conserving component of the decay KS -> pi+ pi- pi0

TL;DR

This paper reports a precise measurement of the CP-conserving amplitude in the decay KS -> pi+ pi- pi0, providing results consistent with previous experiments and theoretical models, enhancing understanding of CP symmetry in kaon decays.

Contribution

The paper presents the first measurement of the amplitude ratio of KS to KL decays for the CP-conserving component, with new values for the parameter lambda.

Findings

Re(lambda) = 0.038 +/- 0.010

Im(lambda) = -0.013 +/- 0.007

Results agree with previous measurements and chiral perturbation theory predictions.

Abstract

The NA48 collaboration has measured the amplitude of the CP-conserving component of the decay KS --> pi+ pi- pi0 relative to KL --> pi+ pi- pi0. For the characteristic parameter lambda, the values Re(lambda) = 0.038 +/-0.010 and Im(lambda) = -0.013 +/- 0.007 have been extracted. These values agree with earlier measurements and with theoretical predictions from chiral perturbation theory.