Determination of the relative decay rate $K_{S} \to \pi e \nu$ / $K_{L} \to \pi e \nu$
- Batley, J R
- Kalmus, George Ernest
- Lazzeroni, C
- Munday, D J
- Patel, M
- Slater, M W
- Wotton, S A
- Arcidiacono, R
- Bocquet, G
- Ceccucci, A
- Cundy, Donald C
- Doble, N
- Falaleev, V
- Gatignon, L
- Gonidec, A
- Grafström, P
- Kubischta, Werner
- Marchetto, F
- Mikulec, I
- Norton, A
- Panzer-Steindel, B
- Rubin, P
- Wahl, H
- Goudzovski, E
- Khristov, P Z
- Kekelidze, V
- Litov, L
- Madigozhin, D T
- Molokanova, N
- Potrebenikov, Yu
- Stoynev, S
- Zinchenko, A
- Monnier, E
- Swallow, E
- Winston, R
- Sacco, R
- Walker, A
- Baldini, W
- Dalpiaz, P
- Frabetti, P L
- Gianoli, A
- Martini, M
- Petrucci, F
- Scarpa, M
- Savrié, M
- Bizzeti, A
- Calvetti, M
- Collazuol, G
- Graziani, G
- Iacopini, E
- Lenti, M
- Martelli, F
- Ruggiero, G
- Veltri, M
- Behler, M
- Eppard, K
- Eppard, M
- Hirstius, A
- Kleinknecht, K
- Koch, U
- Masetti, L
- Marouelli, P
- Moosbrugger, U
- Morales-Morales, C
- Peters, A
- Wanke, R
- Winhart, A
- Dabrowski, A
- Fonseca-Martin, T
- Goy-Lopez, S
- Velasco, M
- Anzivino, Giuseppina
- Cenci, P
- Imbergamo, E
- Lamanna, G
- Lubrano, P
- Michetti, A
- Nappi, A
- Pepé, M
- Petrucci, M C
- Piccini, M
- Valdata, M
- Cerri, C
- Costantini, F
- Fantechi, R
- Fiorini, L
- Giudici, S
- Mannelli, I
- Pierazzini, G
- Sozzi, M
- Cheshkov, C
- Chèze, J B
- De Beer, M
- Debu, P
- Gouge, G
- Marel, Gérard
- Mazzucato, E
- Peyaud, B
- Vallage, B
- Holder, M
- Maier, A
- Ziolkowski, M
- Biino, C
- Cartiglia, N
- Clemencic, M
- Menichetti, E
- Pastrone, N
- Wislicki, W
- Dibon, Heinz
- Jeitler, Manfred
- Markytan, Markytan
- Neuhofer, G
- Widhalm, L
DOIAbstract
The decay rate of $K_{S} \to \pi e \nu$ relative to the rate of $K_{L} \to \pi e \nu$ has been measured by the NA48 collaboration in a neutral Kaon beam originating from 400 GeV proton-Be interactions at the CERN SPS. The result is $0.993 \pm 0.026_{stat} \pm 0.022_{syst}$, compatible with 1 in agreement with the Standard Model prediction at tree level. It implies $BR(K_{S} \to\pi e \nu) = (7.05 \pm 0.18_{stat.} \pm 0.16_{syst.}) \times 10^{-4}$
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