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Title	Model independent measurement of the leptonic kaon decay $K^{\pm}\to \mu^{\pm}\nu_{\mu}e^{+} e^-$ with the NA48/2 experiment
Author(s)	Marchevski, Radoslav (Mainz U.) ; 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 ; Cotta Ramusino, A ; Coward, D ; Cundy, D ; Dabrowski, A ; Dalpiaz, P ; Damiani, C ; De Beer, M ; Derré, J ; Dibon, H ; Dilella, 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 ; Goy Lopez, S ; 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 ; Molokanova, N ; 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 ; Savrié, M ; Scarpa, M ; Shieh, M ; 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
Collaboration	NA48/2
Publication	SISSA, 2016
Number of pages	6
In:	PoS ICHEP2016 (2016) 636
In:	38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016, pp.636
DOI	10.22323/1.282.0636
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA48-2
Abstract	A measurement of the branching ratio of the rare leptonic kaon decay K ± → μ ± ν μ e + e − is pre- sented using data collected by the NA48/2 experiment in 2003 and 2004. The measurement is performed in the region M ee > 140 MeV/c 2 . In this particular region low energy QCD contri- butions become important and can be calculated in the framework of Chiral Perturbation Theory (ChPT). From a total number of 1 . 56 × 10 11 recorded kaon decays, the branching ratio is mea- sured to be B ( K ± → μ ± ν μ e + e − | M ee > 140 MeV / c 2 ) = ( 7 . 8 ± 0 . 2 ) × 10 − 8
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