New measurement of the $K^{\pm} \to \pi^+\pi^-e^{\pm}\nu(K_{e4} )$ decay branching ratio and hadronic form factors
- 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.
- Norton, A.
- Maier, A.
- Patel, M.
- Peters, A.
- Balev, S.
- Frabetti, P.L.
- Gersabeck, E.
- Goudzovski, E.
- Hristov, P.
- Kekelidze, V.
- Kozhuharov, V.
- Litov, L.
- Madigozhin, D.
- Molokanova, N.
- Polenkevich, I.
- Potrebenikov, Yu.
- Stoynev, S.
- Zinchenko, A.
- Monnier, E.
- Swallow, E.
- Winston, R.
- Rubin, P.
- Walker, A.
- Baldini, W.
- Cotta Ramusino, A.
- Dalpiaz, P.
- Damiani, C.
- Fiorini, M.
- Gianoli, A.
- Martini, M.
- Petrucci, F.
- Savrie, M.
- Scarpa, M.
- Wahl, H.
- Bizzeti, A.
- Lenti, M.
- Veltri, M.
- Calvetti, M.
- Iacopini, E.
- Ruggiero, G.
- Behler, M.
- Eppard, K.
- 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.
- Cenci, P.
- Pepe, M.
- Petrucci, M.C.
- Anzivino, G.
- Imbergamo, E.
- Nappi, A.
- Piccini, M.
- Raggi, M.
- Valdata-Nappi, M.
- Cerri, C.
- Fantechi, R.
- Collazuol, G.
- DiLella, L.
- Lamanna, G.
- Mannelli, I.
- Michetti, A.
- Costantini, F.
- Doble, N.
- Fiorini, L.
- Giudici, S.
- Pierazzini, G.
- Sozzi, M.
- Venditti, S.
- Bloch-Devaux, B.
- Cheshkov, C.
- Cheze, J.B.
- De Beer, M.
- Derre, J.
- Marel, G.
- Mazzucato, E.
- Peyaud, B.
- Vallage, B.
- Holder, M.
- Ziolkowski, M.
- Biino, C.
- Cartiglia, N.
- Marchetto, F.
- Bifani, S.
- Clemencic, M.
- Goy Lopez, S.
- Dibon, H.
- Jeitler, M.
- Markytan, M.
- Mikulec, I.
- Neuhofer, G.
- Widhalm, L.
DOIAbstract
A sample of more than one million $K^{\pm} \rightarrow \pi^{+} \pi^{-} e^{\pm} \nu$ ($K_{e4}$) decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003--2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of $K_{e4\gamma}$ decays, is measured to be BR$(K_{e4}) = (4.257 \pm 0.016_{exp} \pm0.031_{ext}) \times 10^{-5}$ with a total relative error of 0.8%. This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the $\pi\pi$ scattering lengths conducted on the same data sample. The overall form f...
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