Measurement of the branching ratio of the decay KL -> pi e nu and extraction of the CKM parameter |Vus|

Preprint

20 October 2004

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ex/0410059

Abstract

We present a new measurement of the branching ratio R of the decay KL -> pi e nu (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.

Keywords

BRANCHING RATIO
CKM PARAMETER
DECAY KL
PI E NU
VUS
KE3

All Related Versions

Version 1, 2004-10-20, ArXiv
Published version: Physics Letters B, 602 (1-2), 41.

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