Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties
- 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, Y.u.
- Stoynev, S.
- Zinchenko, A.
- Monnier, E.
- Swallow, E.
- Winston, R.
- Rubin, P.
- Walker, A.
- Baldini, W.
- Ramusino, A. Cotta
- Dalpiaz, P.
- Damiani, C.
- Fiorini, M.
- Gianoli, A.
- Martini, M.
- Petrucci, F.
- Savrié, M.
- Scarpa, M.
- Wahl, H.
- Bizzeti, A.
- Lenti, M.
- Calvetti, M.
- Celeghini, E.
- Iacopini, E.
- Ruggiero, G.
- Behler, M.
- Eppard, K.
- Gersabeck, M.
- Kleinknecht, K.
- Marouelli, P.
- Masetti, L.
- Moosbrugger, U.
- Morales, C. Morales
- Renk, B.
- Wache, M.
- Wanke, R.
- Winhart, A.
- Coward, D.
- Dabrowski, A.
- Martin, T. Fonseca
- 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.
- Chèze, J. B.
- De Beer, M.
- Derré, J.
- Marel, G.
- Mazzucato, E.
- Peyaud, B.
- Vallage, B.
- Holder, M.
- Ziolkowski, M.
- Biino, C.
- Cartiglia, N.
- Marchetto, F.
- Bifani, S.
- Clemencic, M.
- Lopez, S. Goy
- Dibon, H.
- Jeitler, M.
- Markytan, M.
- Mikulec, I.
- Neuhofer, G.
- Widhalm, L.
- VELTRI, MICHELE
DOIAbstract
A sample of 65210 K-+/- -> pi(0) pi(0)e(+/-)nu (K-e4(00)) decay candidates with 1% background contamination has been collected in 2003-2004 by the NA48/2 collaboration at the CERN SPS. A study of the differential rate provides the first measurement of the hadronic form factor variation in the plane (M-pi pi(2), M-e nu(2)) and brings evidence for a cusp-like structure in the distribution of the squared pi(0)pi(0) invariant mass around . Exploiting a model independent description of this form factor, the branching ratio, inclusive of radiative decays, is obtained using the K-+/- -> pi(0)pi(0)pi(+/-) decay mode as normalization. It is measured to be BR(K-e4(00)) = (2.552 +/- 0.010(stat) +/- 0.010(syst) +/- 0.032(ext)) x 10(-5), which improves ...