First Observation and Measurement of the Decay K+- -> pi+- e+ e- gamma

Details First Observation and Measurement of the Decay K+- -> pi+- e+ e- gamma First Observation and Measurement of the Decay K+- -> pi+- e+ e- gamma

2007-11-27

arxiv.org/abs/0711.4313v1

Phys.Lett.B659:493-499,2008

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 3 figures. Accepted for publication in Phys.Lett.B

Scientific paper

10.1016/j.physletb.2007.11.075

Using the full data set of the NA48/2 experiment, the decay K+- -> pi+- e+ e- gamma is observed for the first time, selecting 120 candidates with 7.3 +- 1.7 estimated background events. With K+- -> pi+- pi0D as normalisation channel, the branching ratio is determined in a model-independent way to be Br(K+- -> pi+- e+ e- gamma, m_eegamma > 260 MeV/c^2) = (1.19 +- 0.12_stat +- 0.04_syst) x 10^-8. This measured value and the spectrum of the e+ e- gamma invariant mass allow a comparison with predictions of Chiral Perturbation Theory.

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