Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Precision measurements of rare kaon decays

Jul 17, 2009, 2:45 PM
Large (Kraków, Poland)


Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Flavour Physics II. Flavour Physics


Mrs Evelina Marinova (INFN Sezione di Perugia)


We report the latest results on rare kaon decays from NA48/2 experiment. Samples of 7200 reconstructed K+- -> pi+- e+ e-, and more than 3000 K+- -> pi+- mu+ mu- events, with very small background contamination, have been collected. The latter is exceeding the total existing statistics by a factor of five. A precise measurement of the branching fractions and the form factors of the rare decays K+- -> pi+- l+ l- has been performed using different theoretical models. The precise measurement of direct photon emission (DE) in the decay K+- -> pi+- pi0 gamma and its interference (INT), with the INT amplitude being observed for the first time, has been finalized. This study is based on the full NA48/2 data set with about 600k reconstructed K+- -> pi+- pi0 gamma decays which is factor of 30 larger than for previous experiments. We report the results on the CP violating asymmetry between K+ and K- obtained from rare kaon decays.

Primary author

Mrs Evelina Marinova (INFN Sezione di Perugia)

Presentation materials