A sample of more than one million K-+/- -> pi(+)pi(-)e(+/-)v (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 +/- 0.016(exp) +/- 0.031(ext)) x 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 factor normalization f(s) = 5.705 +/- 0.017(exp) +/- 0.031(ext) is obtained with a total relative precision of 0.6%. (c) 2012 Elsevier B.V. All rights reserved.

New measurement of the K-+/- -> pi(+)pi(-)e(+/-)v (Ke4) decay branching ratio and hadronic form factors

LAMANNA, GIANLUCA;COSTANTINI, FLAVIO;GIUDICI, SERGIO;SOZZI, MARCO STANISLAO;
2012-01-01

Abstract

A sample of more than one million K-+/- -> pi(+)pi(-)e(+/-)v (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 +/- 0.016(exp) +/- 0.031(ext)) x 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 factor normalization f(s) = 5.705 +/- 0.017(exp) +/- 0.031(ext) is obtained with a total relative precision of 0.6%. (c) 2012 Elsevier B.V. All rights reserved.
2012
Batley, Jr; Kalmus, G; Lazzeroni, C; Munday, Dj; Slater, Mw; Wotton, Sa; 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, Pl; Gersabeck, E; Goudzovski, E; Hristov, P; Kekelidze, V; Kozhuharov, V; Litov, L; Madigozhin, D; Molokanova, N; Polenkevich, I; Potrebenikov, Y; Stoynev, S; Zinchenko, A; Monnier, E; Swallow, E; Winston, R; Rubin, P; Walker, A; Baldini, W; Ramusino, Ac; 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, Cm; Renk, B; Wache, M; Wanke, R; Winhart, A; Coward, D; Dabrowski, A; Martin, Tf; Shieh, M; Szleper, M; Velasco, M; Wood, Md; Cenci, P; Pepe, M; Petrucci, Mc; Anzivino, G; Imbergamo, E; Nappi, A; Piccini, M; Raggi, M; Valdata Nappi, M; Cerri, C; Fantechi, R; Collazuol, G; Dilella, L; Lamanna, Gianluca; Mannelli, I; Michetti, A; Costantini, Flavio; Doble, N; Fiorini, L; Giudici, Sergio; Pierazzini, G; Sozzi, MARCO STANISLAO; Venditti, S; Bloch Devaux, B; Cheshkov, C; Cheze, Jb; 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; Lopez, Sg; Dibon, H; Jeitler, M; Markytan, M; Mikulec, I; Neuhofer, G; Widhalm, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/156337
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