1022 articles – 5249 Notices  [english version]
 HAL : in2p3-00713634, version 1
 arXiv : 1206.7065
 New measurement of the charged kaon semileptonic (Ke4) decay Branching Ratio and Hadronic Form Factors
 NA48/2 Collaboration(s)
 (2012)
 A sample of more than one million Ke4 decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003-2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of radiative Ke4gamma decays, is measured to be BR(Ke4) = (4.257 +/- 0.016_exp +/- 0.031_ext) x 10-5 with a total relative error of 0.8%. This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the pion-pion scattering lengths conducted on the same data sample. The overall form factor normalization f_s = 5.705 +/- 0.017_exp +/- 0.031_ext is obtained with a total relative precision of 0.6%.
 Thème(s) : Physique/Physique des Hautes Energies - ExpériencePhysique/Physique des Hautes Energies - Phénoménologie
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1206.7065
 in2p3-00713634, version 1 http://hal.in2p3.fr/in2p3-00713634 oai:hal.in2p3.fr:in2p3-00713634 Contributeur : Dominique Girod <> Soumis le : Lundi 2 Juillet 2012, 12:00:20 Dernière modification le : Lundi 2 Juillet 2012, 15:14:08