As first observed by the NA48/2 experiment at the CERN SPS, the π 0 π 0 invariant mass (M 00) distribution from K ± → π ± π 0 π 0 decay shows a cusp-like anomaly at M 00 = 2 m +, where m + is the charged pion mass. An analysis to extract the ππ scattering lengths in the isospin I = 0 and I = 2 states, a 0 and a 2, respectively, has been recently reported. In the present work the Dalitz plot of this decay is fitted to a new empirical parameterization suitable for practical purposes, such as Monte Carlo simulations of K ± → π ± π 0 π 0 decays. © 2010 Elsevier B.V. All rights reserved.
Batley, J. R., Culling, A. J., Kalmus, G., Lazzeroni, C., Munday, D. J., Slater, M. W., … Widhalm, L. (2010). Empirical parameterization of the K ± → π ± π 0 π 0 decay Dalitz plot. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 686(2–3), 101–108. https://doi.org/10.1016/j.physletb.2010.02.036