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Title	First observation and study of $K^\pm \to \pi^\pm \pi^0 e^+ e^-$ decay at the NA48/2 experiment
Author(s)	Misheva, M H (Dubna, JINR) ; Anzivino, G ; Arcidiacono, R ; 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 ; Cheze, J B ; Ciemencic, 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 ; Dilella, L ; Doble, N ; Eppard, K ; Falaleev, V ; Fantechi, R ; Fidecaro, M ; Fiorini, L ; Fiorini, M ; Fonseca, T ; Martin, M ; Frabetti, P L ; Gatignon, L ; Gersabeck, E ; Gianoli, A ; Giudici, S ; Gonidec, A ; Goudzovski, E ; Goy Lopez, S ; Holder, M ; Hris­, P ; Iacopini, E ; Imbergamo, E ; Jeitler, M ; Kalmus, G ; Kekelidze, V ; Kleinknecht, K ; Kozhuharov, V ; Kubis­, W ; Lamanna, G ; Lazzeroni, C ; Lenti, M ; Litov, L ; Madigozhin, D ; Maier, A ; Mannelli, I ; Marchetto, F ; Mare, 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 ; Pa­, 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 ; 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 ; Yushchenko, A ; Zinchenko, M ; Ziolkowski, M
Publication	2015
Number of pages	4
In:	50th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 21 - 28 Mar 2015, pp.237-240
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA48-2
Abstract	A sample of almost 2000 $K^\pm \to \pi^\pm \pi^0 e^+ e^-$ rare decays with a background contamination below 3% is observed for the first time by the NA48/2 experiment at CERN/SPS. The preliminary branching ratio in the full kinematic region is obtained to be $BR(K^\pm \to \pi^\pm \pi^0 e^+ e^-)$ = (4.06 ± 0.17) x $10^{-6}$ by analyzing the data set recorded in 3-month NA48/2 run during 2003. The measured value is in agreement with the theoretical prediction within one standard deviation.

Corresponding record in: Inspire