Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8199454 | Physics Letters B | 2006 | 10 Pages |
Abstract
Among some 400 million KSKL pairs produced in e+eâ annihilations at DAΦNE, â¼6500 each of KSâÏ+eâν¯ and KSâÏâe+ν decays have been observed with the KLOE detector. From these, the ratio Î(KSâÏeν)/Î(KSâÏ+Ïâ)=(10.19±0.13)Ã10â4 is obtained, improving the accuracy on BR(KSâÏeν) by a factor of four and providing the most precise test of the ÎS=ÎQ rule. From the partial width Î(KSâÏeν), a value for f+K0(0)ÃVus is obtained that is in agreement with unitarity of the quark-mixing matrix. The lepton charge asymmetry AS=(1.5±9.6stat±2.9syst)Ã10â3 is compatible with the requirements of CPT invariance. The form-factor slope agrees with recent results from semileptonic KL and K+ decays. These are the first measurements of the charge asymmetry and form-factor slope for semileptonic KS decays.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
KLOE Collaboration KLOE Collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, D. Bowring, P. Branchini, R. Caloi, P. Campana, G. Capon, T. Capussela, G. Xu,