PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Quark and Lepton Flavour Physics
Latest results on rare kaon decays from the NA48/2 experiment at CERN
M. Raggi,* G. Anzivino,, R. Arcidiacono,, W. Baldini,, S. Balev,, J.R. Batley,, M. Behler,, S. Bifani,, C. Biino,, A. Bizzeti,, B. Bloch-Devaux,, G. Bocquet,, N. Cabibbo,, M. Calvetti,, N. Cartiglia,, A. Ceccucci,, P. Cenci,, C. Cerri,, C. Cheshkov,, J.B. Chèze,, M. Clemencic,, G. Collazuol,, F. Costantini,, D. Coward,, D. Cundy,, A. Dabrowski,, P. Dalpiaz,, C. Damiani,, J. Derré,, H. Dibon,, L. DiLella,, N. Doble,, K. Eppard,, V. Falaleev,, R. Fantechi,, M. Fidecaro,, L. Fiorini,, M. Fiorini,, P.L. Frabetti,, L. Gatignon,, E. Gersabeck,, A. Gianoli,, S. Giudici,, A. Gonidec,, E. Goudzovski,, M. Holder,, P. Hristov,, E. Iacopini,, E. Imbergamo,, M. Jeitler,, G. Kalmus,, V. Kekelidze,, K. Kleinknecht,, V. Kozhuharov,, W. Kubischta,, G. Lamanna,, C. Lazzeroni,, M. Lenti,, L. Litov,, D. Madigozhin,, A. Maier,, I. Mannelli,, F. Marchetto,, G. Marel,, M. Markytan,, P. Marouelli,, M. Martini,, L. Masetti,, E. Mazzucato,, A. Michetti,, I. Mikulec,, M. Misheva,, N. Molokanova,, E. Monnier,, U. Moosbrugger,, D.J. Munday,, A. Nappi,, G. Neuhofer,, A. Norton,, M. Patel,, M. Pepe,, A. Peters,, F. Petrucci,, M.C. Petrucci,, B. Peyaud,, M. Piccini,, G. Pierazzini,, I. Polenkevich,, Y. Potrebenikov,, M. Raggi,, B. Renk,, P. Rubin,, G. Ruggiero,, M. Savrié,, M. Scarpa,, M. Shieh,, S. Shkarovskiy,, M.W. Slater,, M. Sozzi,, S. Stoynev,, E. Swallow,, M. Szleper,, M. Valdata-Nappi,, B. Vallage,, M. Velasco,, M. Veltri,, S. Venditti,, M. Wache,, H. Wahl,, A. Walker,, R. Wanke,, L. Widhalm,, A. Winhart,, R. Winston,, M.D. Wood,, S.A. Wotton,, A. Zinchenko,, M. Ziolkowski., S.G. Lopez, C.M. Morales, T.F. Martin on behalf of the NA48/2 Collaboration
*corresponding author
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Pre-published on: January 13, 2021
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The NA48/2 experiment at CERN reports the first observation of the K->pi0e+e-decay from an exposure of 1.7x10^11 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 Ke3 and 2.3 million Km3 events collected in 2004 will also be presented.
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