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[en] Final results from an analysis of about 400 K"± → π"±γγ rare decay candidates collected by the NA48/2 and NA62 experiments at CERN during low intensity runs with minimum bias trigger configurations are presented. The results include a model-independent decay rate measurement and fits to Chiral Perturbation Theory (ChPT) descriptions. The data support the ChPT prediction for a cusp in the di-photon invariant mass spectrum at the two pions threshold. (paper)
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596; 
; v. 631(1); [10 p.]
; v. 631(1); [10 p.]