New measurement of the charged kaon semileptonic (Ke4) decay Branching Ratio and Hadronic Form Factors

Abstract : 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%.
Liste complète des métadonnées

http://hal.in2p3.fr/in2p3-00713634
Contributeur : Dominique Girod <>
Soumis le : lundi 2 juillet 2012 - 12:00:20
Dernière modification le : jeudi 15 mars 2018 - 11:40:05

Lien texte intégral

Identifiants

Collections

Citation

J.R. Batley, C. Cheshkov. New measurement of the charged kaon semileptonic (Ke4) decay Branching Ratio and Hadronic Form Factors. Physics Letters B, Elsevier, 2012, 715, pp.105-115. 〈10.1016/j.physletb.2012.07.048〉. 〈in2p3-00713634〉

Partager

Métriques

Consultations de la notice

67