Recent NA48/2 results on rare kaon decays

Dmitry Madigozhin

doi:10.1051/epjconf/201920605001

All issues

Volume 206 (2019)

EPJ Web Conf., 206 (2019) 05001

Abstract

Open Access

Issue		EPJ Web Conf. Volume 206, 2019 XLVIII International Symposium on Multiparticle Dynamics (ISMD 2018)


Article Number		05001
Number of page(s)		10
Section		Hadronic Final States in High PT Interactions
DOI		https://doi.org/10.1051/epjconf/201920605001
Published online		19 April 2019

EPJ Web of Conferences 206, 05001 (2019)
https://doi.org/10.1051/epjconf/201920605001

Recent NA48/2 results on rare kaon decays

Dmitry Madigozhin^*

Joint Institute for Nuclear Research, Joliot-Curie, 6, Dubna, Moscow region 141980, Russia

e-mail: madigo@cern.ch.

Published online: 19 April 2019

Abstract

NA48/2 results contributing to ChPT testing are presented. A sample of 1663 events of the rare decay $K^{\pm} \to μ^{\pm} v e^{+} e^{-}$ $K^ \pm \to \mu ^ \pm ve^ + e^ -$ has been selected with a minimum e ⁺e ⁻eﬀective mass of 140 MeV. The measured model independent decay rate is in agreement with ChPT predictions. The branching ratio of the $K^{\pm} \to μ^{\pm} v e^{+} e^{-}$ $K^ \pm \to \mu ^ \pm ve^ + e^ -$ decay, never observed so far, has been obtained from a sample of about 5000 candidates with less than 6% background, also in agreement with ChPT predictions. In addition, a most precise measurement of the charged kaon semileptonic formfactors has been obtained from 4.4 million K_e3 and 2.3 million K_µ3 events collected in 2004.

^*

for the NA48/2 Collaboration: 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, E. Celeghini, P. Cenci, C. Cerri, C. Cheshkov, J.B. Chèze, M. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, P. Dalpiaz, C. Damiani, M. De Beer, J. Derré, H. Dibon, L. DiLella, N. Doble, K. Eppard, V. Falaleev, R. Fantechi, M. Fidecaro, L. Fiorini, M. Fiorini, T. Fonseca Martin, P.L. Frabetti, L. Gatignon, E. Gersabeck, A. Gianoli, S. Giudici, A. Gonidec, E. Goudzovski, S. Goy Lopez, M. Hita Hochgesand, 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, R. Marchevski, G. Marel, M. Markytan, P. Marouelli, M. Martini, L. Masetti, E. Mazzucato, A. Michetti, I. Mikulec, M. Misheva, N. Molokanova, E. Monnier, U. Moosbrugger, C. Morales Morales, 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, Yu. 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.

This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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