Study of the branching ratio and charge asymmetry for the decay KS--> pi e nu with the KLOE detector

Ambrosino, Fabio; Bowring, D.; Capussela, Tiziana; Chiefari, Giovanni; Doria, A.; Di Donato, C.; Massarotti, Paolo; Meola, S.; Napolitano, Marco; Perfetto, Francesco; Saracino, Giulio

doi:10.1016/j.physletb.2006.03.047

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.

Study of the branching ratio and charge asymmetry for the decay KS--> pi e nu with the KLOE detector / Ambrosino, Fabio; D., Bowring; Capussela, Tiziana; Chiefari, Giovanni; A., Doria; C., Di Donato; Massarotti, Paolo; S., Meola; Napolitano, Marco; Perfetto, Francesco; Saracino, Giulio. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 636:(2006), pp. 173-182. [10.1016/j.physletb.2006.03.047]