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

Precision Measurement of Photon Emission in K+- -> pi+- pi0 gamma Decays

Not scheduled
Auditorium Maximum (Kraków, Poland)

Auditorium Maximum

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Poster session


Dr Cristina Lazzeroni (University of Birmingham, UK)


We report our final result on the measurement of direct photon emission (DE) in the decay K+- -> pi+- pi0 gamma and its interference (INT) with the inner bremsstrahlung amplitude. For this measurement the full NA48/2 data set with about 600k reconstructed K+- -> pi+- pi0 gamma decays was analyzed, which is factor of 30 larger than for previous experiments and a factor of three w.r.t. our preliminary result. From this, the sizes of both the DE and the INT amplitudes have been measured with high precision, with the INT amplitude being observed for the first time. In addition, the CP violating asymmetry between K+ and K- has been obtained to be less than 10^3 in this channel.

Primary author

Dr Cristina Lazzeroni (University of Birmingham, UK)

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