2006/01/31 by The KLOE Collaboration, F. Ambrosino, A. Antonelli +85 · 67 citations
Chemistry · Engineering · Mathematics · Physics and Astronomy · #Asymmetry #Branching (polymer chemistry) #Charge (physics) #Chemistry #Discrete mathematics #Mathematics #Organic chemistry #Particle Accelerators and Free-Electron Lasers #Particle physics #Particle physics theoretical and experimental studies #Philosophy #Physics #Quantum Chromodynamics and Particle Interactions #Scroll #Theology #hep-ex
paper · pdf · doi:10.1016/j.physletb.2006.03.047
published in Physics Letters B 636(3-4), 173-182 (Elsevier BV) · 20 pages, 5 figures, accepted by Phys. Lett. B
openalex publication_date 2006/04/01 · arxiv created 2006/04/12 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/08
Among some 400 million KsKl pairs produced in e+e- annihilations at DAFNE, about 6500 each of Ks->pi+e-nubar and Ks->pi-e+nu decays have been observed with the KLOE detector. From these, the ratio G(Ks->pienu)/G(Ks->p+p-(g))=(10.19+-0.13)10-4 is obtained, improving the accuracy on BR(Ks->pienu) by a factor of four and providing the most precise test of the DeltaS=DeltaQ rule. From the partial width Gamma(Ks->pienu), a value for f+(K0)Vus is obtained that is in agreement with unitarity of the quark-mixing matrix. The lepton charge asymmetry AS=(1.5+-9.6stat+-2.9syst)10-3 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.