%0 Journal Article
%T First observation and study of the K-+/- -> pi(+/-)pi(0)e(+)e(-) decay
%A NA48/2 Collaboration (Batley, J. R. et al
%A Fiorini, L.
%J Physics Letters B
%D 2019
%V 788
%I Elsevier Science Bv
%@ 0370-2693
%G English
%F NA48/2CollaborationBatley+Fiorini2019
%O WOS:000455364400072
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3882), last updated on Sun, 27 Jan 2019 18:41:50 +0000
%X The NA48/2 experiment at CERN reports the first observation of the K-+/- -> pi(+/-)pi(0)e(+)e(-) decay from an exposure of 1.7 x 10(11) charged kaon decays recorded in 2003-2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR(K-+/- -> pi(+/-)pi(0)e(+)e(-)) = (4.24 +/- 0.14) x 10(-6). The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated.
%R 10.1016/j.physletb.2018.11.046
%U http://arxiv.org/abs/1809.02873
%U https://doi.org/10.1016/j.physletb.2018.11.046
%P 552-561