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First observation and study of the K-+/- -> pi(+/-)pi(0)e(+)e(-) decay

AuthorsBatley, J. R.; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W.; Wotton, S. A.; Arcidiacono, R.; Bocquet, G.; Cabibbo, N.; Ceccucci, A.; Cundy, D.; Falaleev, V.; Fidecaro, M.; Gatignon, L.; Gonidec, A.; Kubischta, W.; Maier, A.; Norton, A.; Patel, M.; Peters, A.; Balev, S.; Frabetti, P. L.; Gersabeck, E.; Goudzovski, E.; Hristov, P.; Kekelidze, V.; Kozhuharov, V.; Litov, L.; Madigozhin, D.; Misheva, M.; Molokanova, N.; Polenkevich, I.; Potrebenikov, Yu.; Stoynev, S.; Zinchenko, A.; Monnier, E.; Swallow, E.; Winston, R.; Rubin, P.; Walker, A.; Dalpiaz, P.; Damiani, C.; Fiorini, M.; Martini, M.; Petrucci, F.; Savrie, M.; Scarpa, M.; Wahl, H.; Baldini, W.; Ramusino, A. Cotta; 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.; MoralesMorales, C.; Renk, B.; Wache, M.; Wanke, R.; Winhart, A.; Coward, D.; Dabrowski, A.; Martin, T. Fonseca; Shieh, M.; Szleper, M.; Velasco, M.; Wood, M. D.; Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata-Nappi, M.; Cenci, P.; Pepe, M.; Petrucci, M. C.; Costantini, F.; Doble, N.; Fiorini, L. ; Giudici, S.; Pierazzini, G.; Sozzi, M.; Venditti, S.; Collazuol, G.; DiLella, L.; Lamanna, G.; Mannelli, I.; Michetti, A.; Cerri, C.; Fantechi, R.; Bloch-Devaux, B.; Cheshkov, C.; Cheze, J. B.; De Beer, M.; Derre, J.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.; Holder, M.; Ziolkowski, M.; Bifani, S.; Clemencic, M.; Lopez, S. Goy; Biino, C.; Cartiglia, N.; Marchetto, F.; Dibon, H.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.; NA48/2 Collaboration
Issue DateJan-2019
PublisherElsevier BV
CitationPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 788: 552- 561 (2019)
AbstractThe 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.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2018.11.046
Identifiersdoi: 10.1016/j.physletb.2018.11.046
issn: 0370-2693
Appears in Collections:(IFIC) Artículos
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