Measurement of the branching ratios of the decays Ξ0 → Σ+ e- over(ν, ̄)e and over(Ξ0, -) → over(Σ+, -) e+ νe

J. R. Batley, G. E. Kalmus, C. Lazzeroni, D. J. Munday, M. Patel, M. W. Slater, S. A. Wotton, R. Arcidiacono, G. Bocquet, A. Ceccucci, D. Cundy, N. Doble, V. Falaleev, L. Gatignon, A. Gonidec, P. Grafström, W. Kubischta, F. Marchetto, I. Mikulec, A. NortonB. Panzer-Steindel, P. Rubin, H. Wahl, E. Goudzovski, P. Hristov, V. Kekelidze, L. Litov, D. Madigozhin, N. Molokanova, Yu Potrebenikov, S. Stoynev, A. Zinchenko, E. Monnier, E. C. Swallow, R. Winston, R. Sacco, A. Walker, W. Baldini, P. Dalpiaz, P. L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Scarpa, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, E. Iacopini, M. Lenti, G. Ruggiero, M. Veltri, M. Behler, K. Eppard, M. Eppard, A. Hirstius, K. Kleinknecht, U. Koch, L. Masetti, P. Marouelli, U. Moosbrugger, C. Morales Morales, A. Peters, R. Wanke, A. Winhart, A. Dabrowski, T. Fonseca Martin, M. Velasco, G. Anzivino, P. Cenci, E. Imbergamo, G. Lamanna, P. Lubrano, A. Michetti, A. Nappi, M. Pepe, M. C. Petrucci, M. Piccini*, M. Valdata, C. Cerri, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, C. Cheshkov, J. B. Cheze, M. De Beer, P. Debu, G. Gouge, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, C. Biino, N. Cartiglia, M. Clemencic, S. Goy Lopez, E. Menichetti, N. Pastrone, W. Wislicki, H. Dibon, M. Jeitler, M. Markytan, G. Neuhofer, L. Widhalm

*Corresponding author for this work

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23 Scopus citations

Abstract

From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Ξ0 → Σ+ e- over(ν, ̄)e candidates (with the subsequent Σ+ → p π0 decay) and 555 over(Ξ0, -) → over(Σ+, -) e+ νe candidates with background contamination of 215 ± 44 and 136 ± 8 events, respectively. From these samples, the branching ratios BR (Ξ0 → Σ+ e- over(ν, ̄)e) = (2.51 ± 0.03stat ± 0.09syst) × 10-4 and BR (over(Ξ0, -) → over(Σ+, -) e+ νe) = (2.55 ± 0.14stat ± 0.10syst) × 10-4 were measured allowing the determination of the CKM matrix element | Vus | = 0.209-0.028+0.023. Using the Particle Data Group average for | Vus | obtained in semileptonic kaon decays, we measured the ratio g1 / f1 = 1.20 ± 0.05 of the axial-vector to vector form factors.

Original languageEnglish (US)
Pages (from-to)36-46
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume645
Issue number1
DOIs
StatePublished - Feb 1 2007

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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