The NA48/2 experiment collected data in 2003 and 2004 with the main purpose to study direct CP violation in charged kaons decaying into three pions. Thanks to the huge statistics collected, other studies are also possible. This paper reports the first observation of the K± → π±π0e+e− decay from an exposure of 1.7×1011 charged kaon decays. The Branching Ratio has been determined to be BR(K± → π±π0e+e−) = (4.24 ±0.14) ×10−6, using a sample of 4919 candidates with 4.9% background contamination. Studies of the kinematic space and of several P- and CP-violating asymmetries are also reported.
The K± → π±π0e+e− decay: First observation and study with the NA48/2 experiment at CERN / Anzivino, G.; Anzivino, G.; Arcidiacono, R.; Baldini, W.; Balev, S.; Batley, J. R.; Behler, M.; Bifani, S.; Biino, C.; Bizzeti, A.; Bloch-Devaux, B.; Bocquet, G.; Cabibbo, N.; Calvetti, M.; Cartiglia, N.; Ceccucci, A.; Celeghini, E.; Cenci, P.; Cerri, C.; Cheshkov, C.; Cheze, J. B.; Clemencic, M.; Collazuol, G.; Costantini, F.; Cotta Ra-Musino, A.; Coward, D.; Cundy, D.; Dabrowski, A.; Dalpiaz, P.; Damiani, C.; de Beer, M.; Derre, J.; Dibon, H.; Dilella, L.; Doble, N.; Eppard, K.; Falaleev, V.; Fantechi, R.; Fidecaro, M.; Fiorini, L.; Fiorini, M.; Fonseca Martin, T.; Frabetti, P. L.; Gatignon, L.; Gersabeck, E.; Gianoli, A.; Giudici, S.; Gonidec, A.; Goudzovski, E.; Goy Lopez, S.; Hita-Hochgesand, M.; Holder, M.; Hristov, P.; Iacopini, E.; Imbergamo, E.; Jeitler, M.; Kalmus, G.; Kekelidze, V.; Kleinknecht, K.; Kozhuharov, V.; Kubischta, W.; Lamanna, G.; Lazzeroni, C.; Lenti, M.; Litov, L.; Madigozhin, D.; Maier, A.; Mannelli, I.; Marchetto, F.; Marel, G.; Markytan, M.; Marouelli, P.; Martini, M.; Masetti, L.; Mazzucato, E.; Michetti, A.; Mikulec, I.; Misheva, M.; Molokanova, N.; Monnier, E.; Moosbrugger, U.; Morales Morales, C.; Munday, D. J.; Nappi, A.; Neuhofer, G.; Norton, A.; Patel, M.; Pepe, M.; Peters, A.; Petrucci, F.; Petrucci, M. C.; Peyaud, B.; Piccini, M.; Pierazzini, G.; Polenkevich, I.; Potrebenikov, Yu.; Raggi, M.; Renk, B.; Rubin, P.; Ruggiero, G.; Savrie, M.; Scarpa, M.; Shieh, M.; Slater, M. W.; Sozzi, M.; Stoynev, S.; Swallow, E.; Szleper, M.; Valdata-Nappi, M.; Vallage, M.; Velasco, M.; Veltri, M.; Venditti, S.; Wache, M.; Wahl, H.; Walker, A.; Wanke, R.; Widhalm, L.; Winhart, A.; Winston, R.; Wood, M. D.; Wotton, S. A.; Zinchenko, A.; Ziolkowski, M.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - 364:(2019), pp. 85098917004-85098917004. (Intervento presentato al convegno 2019 European Physical Society Conference on High Energy Physics, EPS-HEP 2019 tenutosi a bel nel 2019).
The K± → π±π0e+e− decay: First observation and study with the NA48/2 experiment at CERN
Bizzeti A.Membro del Collaboration Group
;Cerri C.;Damiani C.;Lenti M.;Mazzucato E.;Piccini M.;Ruggiero G.;
2019
Abstract
The NA48/2 experiment collected data in 2003 and 2004 with the main purpose to study direct CP violation in charged kaons decaying into three pions. Thanks to the huge statistics collected, other studies are also possible. This paper reports the first observation of the K± → π±π0e+e− decay from an exposure of 1.7×1011 charged kaon decays. The Branching Ratio has been determined to be BR(K± → π±π0e+e−) = (4.24 ±0.14) ×10−6, using a sample of 4919 candidates with 4.9% background contamination. Studies of the kinematic space and of several P- and CP-violating asymmetries are also reported.
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