We present a new measurement of the branching ratio R of the decay KL →π ± e ∓ ν, denoted as Ke3, relative to all charged KL decays with two tracks, based on data taken with the NA48 detector at the CERN SPS.We measure R = 0.4978 ± 0.0035. From this we derive the Ke3 branching fraction and the weak coupling parameter |Vus | in the CKM matrix. We obtain |Vus |f+(0) = 0.2146 ± 0.0016, where f+(0) is the vector form factor in the Ke3 decay.
Measurement of the branching ratio of the decay K(L)-->pi+-e-+nu and extraction of the CKM parameter |V(us)|
ANZIVINO, Giuseppina;IMBERGAMO, ERMANNO;NAPPI, Aniello;PICCINI, Mauro
2004
Abstract
We present a new measurement of the branching ratio R of the decay KL →π ± e ∓ ν, denoted as Ke3, relative to all charged KL decays with two tracks, based on data taken with the NA48 detector at the CERN SPS.We measure R = 0.4978 ± 0.0035. From this we derive the Ke3 branching fraction and the weak coupling parameter |Vus | in the CKM matrix. We obtain |Vus |f+(0) = 0.2146 ± 0.0016, where f+(0) is the vector form factor in the Ke3 decay.File in questo prodotto:
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