First Observation And Study Of The K-+/- -> Pi(+/-)Pi(0)E(+)E(-) Decay

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

PHYSICS LETTERS B（2019）

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摘要

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. (C) 2018 The Author(s). Published by Elsevier B.V.

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