From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Xi(0) -> Sigma(+)e(-)nu(e) candidates (with the subsequent Sigma(+) -> p pi(0) decay) and 555 (Xi(0)) over bar -> (Sigma(+)) over bare+nu(e) candidates with background contamination of 215 +/- 44 and 136 +/- 8 events, respectively. From these samples, the branching ratios BR(Xi(0) -> Sigma(+)e(-)nu(e)) = (2.51 +/- 0.03(stat) +/- 0.09(syst)) x 10(-4) and BR((Xi(0)) over bar -> (Sigma(+)) over bare(+)nu(e)) = (2.55 +/- 0.14(stat) +/- 0.10(syst)) x 10(-4) were measured allowing the determination of the CKM matrix element vertical bar V-us vertical bar = 0.209(-0.028)(+0.023) Using the Particle Data Group average for vertical bar V-us vertical bar obtained in semileptonic kaon decays, we measured the ratio g(1)/f(1) = 1.20 +/- 0.05 of the axial-vector to vector formfactors. (c) 2006 Elsevier B.V. All rights reserved.

Measurement of the branching ratios of the decays Xi(0) -> Sigma(+)e(-)(v)over-bar (e) and (Xi)over-bar(0) -> (Sigma)over-bar(+) e(+)v(e)

LAMANNA, GIANLUCA;COSTANTINI, FLAVIO;GIUDICI, SERGIO;SOZZI, MARCO STANISLAO;
2007

Abstract

From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Xi(0) -> Sigma(+)e(-)nu(e) candidates (with the subsequent Sigma(+) -> p pi(0) decay) and 555 (Xi(0)) over bar -> (Sigma(+)) over bare+nu(e) candidates with background contamination of 215 +/- 44 and 136 +/- 8 events, respectively. From these samples, the branching ratios BR(Xi(0) -> Sigma(+)e(-)nu(e)) = (2.51 +/- 0.03(stat) +/- 0.09(syst)) x 10(-4) and BR((Xi(0)) over bar -> (Sigma(+)) over bare(+)nu(e)) = (2.55 +/- 0.14(stat) +/- 0.10(syst)) x 10(-4) were measured allowing the determination of the CKM matrix element vertical bar V-us vertical bar = 0.209(-0.028)(+0.023) Using the Particle Data Group average for vertical bar V-us vertical bar obtained in semileptonic kaon decays, we measured the ratio g(1)/f(1) = 1.20 +/- 0.05 of the axial-vector to vector formfactors. (c) 2006 Elsevier B.V. All rights reserved.
Batley, Jr; Kalmus, Ge; Lazzeroni, C; Munday, Dj; Patel, M; Slater, Mw; Wotton, Sa; Arcidiacono, R; Bocquet, G; Ceccucci, A; Cundy, D; Doble, N; Falaleev, V; Gatignon, L; Gonidec, A; Grafstrom, P; Kubischta, W; Marchetto, F; Mikulec, I; Norton, A; Panzer Steindel, B; Rubin, P; Wahl, H; Goudzovski, E; Hristov, P; Kekelidze, V; Litov, L; Madigozhin, D; Molokanova, N; Potrebenikov, Y; Stoynev, S; Zinchenko, A; Monnier, E; Swallow, Ec; Winston, R; Sacco, R; Walker, A; Baldini, W; Dalpiaz, P; Frabetti, Pl; Gianoli, A; Martini, M; Petrucci, F; Scarpa, M; Savrie, M; Bizzeti, A; Calvetti, M; Collazuol, G; Iacopini, E; Lenti, M; Ruggiero, G; Veltri, M; Behler, M; Eppard, K; Eppard, M; Hirstius, A; Kleinknecht, K; Koch, U; Masetti, L; Marouelli, P; Moosbrugger, U; Morales, Cm; Peters, A; Wanke, R; Winhart, A; Dabrowski, A; Martin, Tf; Velasco, M; Anzivino, G; Cenci, P; Imbergamo, E; Lamanna, Gianluca; Lubrano, P; Michetti, A; Nappi, A; Pepe, M; Petrucci, Mc; Piccini, M; Valdata, M; Cerri, C; Costantini, Flavio; Fantechi, R; Fiorini, L; Giudici, Sergio; Mannelli, I; Pierazzini, G; Sozzi, MARCO STANISLAO; Cheshkov, C; Cheze, Jb; De Beer, M; Debu, P; Gouge, G; Marel, G; Mazzucato, E; Peyaud, B; Vallage, B; Holder, A; Maier, A; Ziolkowski, A; Biino, C; Cartiglia, N; Clemencic, M; Lopez, Sg; Menichetti, E; Pastrone, N; Wislicki, W; Dibon, H; Jeitler, M; Markytan, M; Neuhofer, G; Widhalm, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/194761
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