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

Raggi, Mauro; 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.; Cenci,, P.; Cerri,, C.; Cheshkov,, C.; Chèze,, J.B.; Clemencic,, M.; Collazuol,, G.; Costantini,, F.; Coward,, D.; Cundy,, D.; Dabrowski,, A.; Dalpiaz,, P.; Damiani,, C.; Derré,, J.; Dibon,, H.; DiLella,, L.; Doble,, N.; Eppard,, K.; Falaleev,, V.; Fantechi,, R.; Fidecaro,, M.; Fiorini,, L.; Fiorini,, M.; Frabetti,, P.L.; Gatignon,, L.; Gersabeck,, E.; Gianoli,, A.; Giudici,, S.; Gonidec,, A.; Goudzovski,, E.; 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.; 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.; Savrié,, M.; Scarpa,, M.; Shieh,, M.; Shkarovskiy,, S.; Slater,, M.W.; Sozzi,, M.; Stoynev,, S.; Swallow,, 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.; Lopez, S. Goy; Morales, C. Morales; Martin, T. Fonseca; on behalf of the NA48/2 Collaboration,

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

Published on: —

Abstract

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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