Observation of a cusp-like structure in the pizero-pizero invariant mass distribution from K+- ==> pi+- pizero pizero decay and determination of the pi-pi scattering lengths

C. Lazzeroni; D.J. Munday; et al; M.W. Slater; S.A. Wotton; The NA48/2 Collaboration J.R. Batley

arxiv: hep-ex/0511056 · v2 · submitted 2005-11-28 · ✦ hep-ex

Observation of a cusp-like structure in the pizero-pizero invariant mass distribution from K+- ==> pi+- pizero pizero decay and determination of the pi-pi scattering lengths

The NA48/2 Collaboration J.R. Batley , C. Lazzeroni , D.J. Munday , M.W. Slater , S.A. Wotton , et al This is my paper

classification ✦ hep-ex

keywords pizeromassscatteringanomalydecaydeterminationdistributioninvariant

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We report the results from a study of ~23 Million K+- ==> pi+- pizero pizero decays recorded by the NA48/2 experiment at the CERN SPS, showing an anomaly in the pizero pizero invariant mass distribution in the region around 2m+, where m+ is the charged pion mass. This anomaly, never observed in previous experiments, can be interpreted as an effect due mainly to the final state charge exchange scattering process pi+ pi- ==> pizero pizero in K+- ==> pi+- pi+ pi- decay. It provides a precise determination of a0 - a2, the difference between the pi-pi scattering lengths in the isospin I=0 and I=2 states.

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