CERN Accelerating science

Article
Title Latest results on rare kaon decays from the NA48/2 experiment @CERN
Author(s)

Molokanova, N (Dubna, JINR) ; 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

Publication 2020
Number of pages 9
In: Int. J. Mod. Phys. A 35 (2020) 2044019
In: 8th International Conference on New Frontiers in Physics (ICNFP 2019), Kolymbari, Crete, Greece, 21 - 29 Aug 2019, pp.2044019
DOI 10.1142/S0217751X20440194
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; NA48-2
Abstract 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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