Detailed study of the KLπ0π0π0 Dalitz plot

E. Abouzaid et al. (KTeV Collaboration)
Phys. Rev. D 78, 032009 – Published 15 August 2008

Abstract

Using a sample of 68.3×106 KLπ0π0π0 decays collected in 1996–1999 by the KTeV (E832) experiment at Fermilab, we present a detailed study of the KLπ0π0π0 Dalitz plot density. We report the first observation of interference from KLπ+ππ0 decays in which π+π rescatters to π0π0 in a final-state interaction. This rescattering effect is described by the Cabibbo-Isidori model, and it depends on the difference in pion scattering lengths between the isospin I=0 and I=2 states, a0a2. Using the Cabibbo-Isidori model, and fixing (a0a2)mπ+=0.268±0.017 as measured by the CERN-NA48 collaboration, we present the first measurement of the KLπ0π0π0 quadratic slope parameter that accounts for the rescattering effect: h000=(+0.59±0.20stat±0.48syst±1.06ext)×103, where the uncertainties are from data statistics, KTeV systematic errors, and external systematic errors. Fitting for both h000 and a0a2, we find h000=(2.09±0.62stat±0.72syst±0.28ext)×103, and mπ+(a0a2)=0.215±0.014stat±0.025syst±0.006ext; our value for a0a2 is consistent with that from NA48.

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  • Received 24 June 2008

DOI:https://doi.org/10.1103/PhysRevD.78.032009

©2008 American Physical Society

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Vol. 78, Iss. 3 — 1 August 2008

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