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

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dc.creator2 Collaboration
dc.creatorLazzeroni, C.
dc.creatorMunday, D. J.
dc.creatorSlater, M. W.
dc.creatorWotton, S. A.
dc.date2005-11-28
dc.date2005-12-12
dc.date.accessioned2026-07-07T11:26:35Z
dc.date.available2026-07-07T11:26:35Z
dc.descriptionWe 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.
dc.description16 pages, 7 figures Accepted for publication in Physics Letters B
dc.identifierhttps://arxiv.org/abs/hep-ex/0511056
dc.identifierhttp://arxiv.org/abs/hep-ex/0511056
dc.identifierPhys.Lett.B633:173-182,2006
dc.identifierdoi:10.1016/j.physletb.2005.11.087
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195870
dc.subjectHigh Energy Physics - Experiment
dc.titleObservation 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
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