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The NA62 and NA48/2 experiments at CERN collected a large sample of charged kaon decays with a low intensity beam and minimum bias trigger conditions in 2004 (NA48/2) and 2007 (NA62). This allowed measurements of a number of rare decays that are difficult to address in conventional high intensity experiments with highly selective trigger conditions. In particular, large samples of K±→ π±γγ decays have been collected, allowing precision tests of the Chiral Perturbation Theory

Study of the rare decayK±→π±γγ

Study of the rare decayK^±→π^±γγ