The NA48/2 Collaboration at CERN has accumulated and analysed unprecedented statistics of rare kaon decays in the Ke4 modes: Ke4(+-) (K+- -> pi+ pi- e+- n) and Ke4(00) (K00 -> pi0 pi0 e+- n) with nearly one percent background contamination. It leads to the improved measurement of branching fractions and detailed form factor studies. New final results from the analysis of 381 K+- -> pi+- gamma gamma rare decay candidates collected by the NA48/2 and NA62 experiments at CERN are presented. The results include a decay rate measurement and fits to Chiral Perturbation Theory (ChPT) description.
Recent NA48/2 and NA62 results
ANZIVINO, Giuseppina;IMBERGAMO, ERMANNO;PICCINI, Mauro
2014
Abstract
The NA48/2 Collaboration at CERN has accumulated and analysed unprecedented statistics of rare kaon decays in the Ke4 modes: Ke4(+-) (K+- -> pi+ pi- e+- n) and Ke4(00) (K00 -> pi0 pi0 e+- n) with nearly one percent background contamination. It leads to the improved measurement of branching fractions and detailed form factor studies. New final results from the analysis of 381 K+- -> pi+- gamma gamma rare decay candidates collected by the NA48/2 and NA62 experiments at CERN are presented. The results include a decay rate measurement and fits to Chiral Perturbation Theory (ChPT) description.File in questo prodotto:
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