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.
Empirical parameterization of the K+- -> pi+- pi0 pi0 decay Dalitz plot
ANZIVINO, Giuseppina;IMBERGAMO, ERMANNO;NAPPI, Aniello;PICCINI, Mauro;RAGGI, MAURO;VALDATA, Marisa
2010
Abstract
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.File in questo prodotto:
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