Latest results on rare kaon decays from the NA48/2 experiment @CERN

The NA48/2 experiment at CERN reports the first observation of the $K^± → π^±π^0e^+e^−$ decay from an exposure of $1.7 × 10^{11}$ 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 kine...

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Detalles Bibliográficos
Autores principales: Molokanova, N, 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, B Chèze, J, Clemencic, M, Collazuol, G, Costantini, F, Cotta Ramusino, A, Coward, D, Cundy, D, Dabrowski, A, Dalpiaz, P, Damiani, C, De Beer, M, Derre, J, Dibon, H, Di Lella, 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, Lopez, S Goy, 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, 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, Shkarovskiy, S, Slater, M W, Sozzi, M, Stoynev, S, Swa-low, E, Szleper, M, Valdata-Nappi, M, Vallage, B, 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
Lenguaje:eng
Publicado: 2020
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1142/S0217751X20440194
http://cds.cern.ch/record/2799796
Descripción
Sumario:The NA48/2 experiment at CERN reports the first observation of the $K^± → π^±π^0e^+e^−$ decay from an exposure of $1.7 × 10^{11}$ 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. 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. The most precise measurement of the charged kaon semi-leptonic form factors obtained by NA48/2 with 4.4 million $Ke_3$ and 2.3 million $K_{μ3}$ events collected in 2004 will also be presented.

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