25-29 August 2014
Schloss Waldthausen, Mainz, Germany
Europe/Berlin timezone

ChPT tests at NA48 and NA62 experiments at CERN

27 Aug 2014, 09:30
Schloss Waldthausen, Mainz, Germany

Schloss Waldthausen, Mainz, Germany

Heavy Quarks & Leptons Kaon Physics


Dmitri Madigozhin (JINR Dubna)


New final results from an analysis of about 400 K+- --> pi+- gamma gamma 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) description. The data support the ChPT prediction for a cusp in the di-photon invariant mass spectrum at the two pion threshold. The NA48/2 Collaboration at CERN has accumulated unprecedented statistics of rare kaon decays in the Ke4 modes Ke4(+-) to pi+ pi- e nu and Ke4(00) to pi0 pi0 e nu with ~one percent background contamination. The detailed study of form factors is sensitive to small isospin symmetry breaking effects. This brings new inputs to low energy QCD description and crucial tests of predictions from Chiral Perturbation Theory and lattice QCD calculations.

Primary author

Cristina Lazzeroni (NA62 Collaboration)

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