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New high statistics measurement of $K_{e4}$ decay form factors and $\pi \pi$ scattering phase shifts (2007) |
- Batley, J Richard,
- Culling, A J,
- Kalmus, George Ernest,
- Lazzeroni, C,
- Munday, D J,
- Slater, M W,
- Wotton, S A,
- Arcidiacono, R,
- Bocquet, G,
- Cabibbo, Nicola,
- Ceccucci, A,
- Cundy, Donald C,
- Falaleev, V,
- Fidecaro, Maria,
- Gatignon, L,
- Gonidec, A,
- Kubischta, Werner,
- Norton, A,
- Maier, A,
- Patel, M,
- Peters, A,
- Balev, S,
- Frabetti, P L,
- Goudzovski, E,
- Khristov, P Z,
- Kekelidze, V,
- Kozhuharov, V,
- Litov, L,
- Madigozhin, D T,
- Marinova, E,
- 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,
- Savrié, M,
- Scarpa, M,
- Wahle, H,
- Bizzeti, A,
- Calvetti, M,
- Celeghini, E,
- Iacopini, E,
- Lenti, M,
- Martelli, F,
- Ruggiero, G,
- Veltri, M,
- 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,
- Anzivino, Giuseppina,
- Cenci, P,
- Imbergamo, E,
- Nappi, A,
- Pepé, M,
- Petrucci, M C,
- Piccini, M,
- Raggi, M,
- Valdata-Nappi, M,
- Cerri, C,
- Collazuol, G,
- Costantini, F,
- Di Lella, L,
- Doble, N,
- Fantechi, R,
- Fiorini, L,
- Giudici, S,
- Lamanna, G,
- Mannelli, I,
- Michetti, A,
- Pierazzini, G,
- Sozzi, M,
- Bloch-Devaux, B,
- Cheshkov, C,
- Chèze, J B,
- De Beer, M,
- Derré, J,
- Marel, Gérard,
- Mazzucato, E,
- Peyaud, B,
- Vallage, B,
- Holder, M,
- Ziolkowski, M,
- Bifani, S,
- Biino, C,
- Cartiglia, N,
- Clemencic, M,
- Goy-Lopez, S,
- Marchetto, F,
- Dibon, Heinz,
- Jeitler, Manfred,
- Markytan, Manfred,
- Mikulec, I,
- Neuhofer, G,
- Widhalm, L
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Abstract |
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We report results from a new measurement of the K_{e4} decay K^{+-} -> \pi^+ \pi^- e^{+-} v by the NA48/2 collaboration at the CERN SPS, based on a partial sample of more than 670000 Ke4 decays in both charged modes collected in 2003. The form factors of the hadronic current (F, G, H) and pi pi scattering phase shift delta00-delta11 have been measured using a model-independent method and their variation with the pi pi mass has been investigated. Thanks to a sizeable acceptance at large pi pi mass, a low background and a very good resolution, an improved accuracy (+- 0.006 stat +- 0.002 syst), a factor two better than in the previous measurement, is reached when extracting the pi pi scattering length a00. |
Publication details |
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