A measurement of the CP-conserving component of the decay $K^{0}_{S} \to \pi^{+}\pi^{-}\pi^{0}$

The NA48 collaboration has measured the amplitude of the CP-conserving component of the decay $K^{0}_{S} \to \pi^{+}\pi^{-}\pi^{0}$ relative to $K^{0}_{L} \to \pi^{+}\pi^{-}\pi^{0}$. For the characteristic parameter $\lambda$, the values Re $\lambda = 0.038 \pm 0.010$ and Im $\lambda = - 0.013 \pm 0.007$ have been extracted. These values agree with earlier measurements and with theoretical predictions from chiral perturbation theory.