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    Kalmus, G.; Lazzeroni, C.; Munday, D.J.; Wotton, S.A.; Cabibbo, N.; Ceccucci, A.; Fidecaro, M.; Gatignon, L.; Kubischta, W.; Maier, A.; Norton, A.; Patel, M.; Peters, A.; Balev, S.; Frabetti, P.L.; Gersabeck, E.; Goudzovski, E.; Kekelidze, V.; Kozhuharov, V.; Litov, L.; Madigozhin, D.; Misheva, M.; Molokanova, N.; Polenkevich, I.; Potrebenikov, Yu; Stoynev, S.; Zinchenko, A.; Monnier, E.; Swallow, E.; Rubin, P.; Walker, A.; Dalpiaz, P.; Damiani, C.; Martini, M.; Petrucci, F.; Savrié, M.; Scarpa, M.; Cotta Ramusino, A.; Gianoli, A.; Calvetti, M.; Celeghini, E.; Iacopini, E.; Lenti, M.; Ruggiero, G.; Bizzeti, A.; Veltri, M.; Behler, M.; Eppard, K.; Hita-Hochgesand, M.; Kleinknecht, K.; Marouelli, P.; Masetti, L.; Moosbrugger, U.; Renk, B.; Wache, M.; Wanke, R.; Winhart, A.; Dabrowski, A.; Fonseca Martin, T.; Shieh, M.; Velasco, M.; Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata-Nappi, M.; Pepe, M.; Petrucci, M.C.; Doble, N.; Fiorini, L.; Giudici, S.; Venditti, S.; Collazuol, G.; DiLella, L.; Lamanna, G.; Michetti, A.; Cerri, C.; Fantechi, R.; Bloch-Devaux, B.; Cheshkov, C.; Chèze, J.B.; De Beer, M.; Derré, J.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.; Holder, M.; Ziolkowski, M.; Bifani, S.; Goy Lopez, S.; Biino, C.; Cartiglia, N.; Marchetto, F.; Dibon, H.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.

    Physics letters. B, 01/2019, Letnik: 788, Številka: C
    Journal Article

    The NA48/2 experiment at CERN reports the first observation of the K±→π±π0e+e− decay from an exposure of 1.7×1011 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±→π±π0e+e−)=(4.24±0.14)×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.