TY  - JOUR
AU  - NA48/2 Collaboration (Batley, J. R. et al
AU  - Fiorini, L.
PY  - 2019
DA  - 2019//
TI  - First observation and study of the K-+/- -> pi(+/-)pi(0)e(+)e(-) decay
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 552
EP  - 561
VL  - 788
PB  - Elsevier Science Bv
AB  - 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.
SN  - 0370-2693
UR  - http://arxiv.org/abs/1809.02873
UR  - https://doi.org/10.1016/j.physletb.2018.11.046
DO  - 10.1016/j.physletb.2018.11.046
LA  - English
N1  - WOS:000455364400072
ID  - NA48/2CollaborationBatley+Fiorini2019
ER  -