Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10725225 | Physics Letters B | 2007 | 11 Pages |
Abstract
From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Î0âΣ+eâν¯e candidates (with the subsequent Σ+âpÏ0 decay) and 555 Î0¯âΣ+¯e+νe candidates with background contamination of 215±44 and 136±8 events, respectively. From these samples, the branching ratios BR(Î0âΣ+eâν¯e)=(2.51±0.03stat±0.09syst)Ã10â4 and BR(Î0¯âΣ+¯e+νe)=(2.55±0.14stat±0.10syst)Ã10â4 were measured allowing the determination of the CKM matrix element |Vus|=0.209â0.028+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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
NA48/1 Collaboration NA48/1 Collaboration, 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,