First observation and study of the $K^{\pm} \to \pi^{\pm} \pi^{0} e^{+} e^{-}$ decay
- Batley, J.R.
- Kalmus, G.
- Lazzeroni, C.
- Munday, D.J.
- Slater, M.W.
- Wotton, S.A.
- Arcidiacono, R.
- Bocquet, G.
- Cabibbo, N.
- Ceccucci, A.
- Cundy, D.
- Falaleev, V.
- Fidecaro, M.
- Gatignon, L.
- Gonidec, A.
- Kubischta, W.
- Maier, A.
- Norton, A.
- Patel, M.
- Peters, A.
- Balev, S.
- Frabetti, P.L.
- Gersabeck, E.
- Goudzovski, E.
- Hristov, P.
- Kekelidze, V.
- Kozhuharov, V.
- Litov, L.
- Madigozhin, D.
- Misheva, M.
- Molokanova, N.
- Polenkevich, I.
- Potrebenikov, Yu.
- Stoynev, S.
- Zinchenko, A.
- Monnier, E.
- Swallow, E.
- Winston, R.
- Rubin, P.
- Walker, A.
- Dalpiaz, P.
- Damiani, C.
- Fiorini, M.
- Martini, M.
- Petrucci, F.
- Savrié, M.
- Scarpa, M.
- Wahl, H.
- Baldini, W.
- Cotta Ramusino, A.
- Gianoli, A.
- Calvetti, M.
- Celeghini, E.
- Iacopini, E.
- Lenti, M.
- Ruggiero, G.
- Bizzeti, A.
- Veltri, M.
- Behler, M.
- Eppard, K.
- Hita-Hochgesand, M.
- Kleinknecht, K.
- Marouelli, P.
- Masetti, L.
- Moosbrugger, U.
- Morales Morales, C.
- Renk, B.
- Wache, M.
- Wanke, R.
- Winhart, A.
- Coward, D.
- Dabrowski, A.
- Fonseca Martin, T.
- Shieh, M.
- Szleper, M.
- Velasco, M.
- Wood, M.D.
- Anzivino, G.
- Imbergamo, E.
- Nappi, A.
- Piccini, M.
- Raggi, M.
- Valdata-Nappi, M.
- Cenci, P.
- Pepe, M.
- Petrucci, M.C.
- Costantini, F.
- Doble, N.
- Fiorini, L.
- Giudici, S.
- Pierazzini, G.
- Sozzi, M.
- Venditti, S.
- Collazuol, G.
- DiLella, L.
- Lamanna, G.
- Mannelli, I.
- Michetti, A.
- Cerri, C.
- Fantechi, R.
- Bloch-Devaux, B.
- Cheshkov, C.
- Chèze, J.B.
- De Beer, M.
- Derré, J.
- Marel, G.
- Mazzucato, E.
- Peyaud, B.
- Vallage, B.
- Holder, M.
- Ziolkowski, M.
- Bifani, S.
- Clemencic, M.
- Goy Lopez, S.
- Biino, C.
- Cartiglia, N.
- Marchetto, F.
- Dibon, H.
- Jeitler, M.
- Markytan, M.
- Mikulec, I.
- Neuhofer, G.
- Widhalm, L.
DOIAbstract
The NA48/2 experiment at CERN reports the first observation of the $K^\pm \to \pi^\pm \pi^0 e^+ e^-$ decay from an exposure of $1.7 \times 10^{11}$ 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, BR($K^\pm \to \pi^\pm \pi^0 e^+ e^-)=(4.24 \pm 0.14)\times10^{-6}$. 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 NA48/2 experiment at CERN reports the first observation of the K±→π±π0e+e− decay from an exposure of 1.7×1011 charged kaon decays r...
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