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

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.

arXiv comment18 pages, 8 figures. accepted by Phys Lett. B

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• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• $K_{\ell 3}$ decays in Chiral Perturbation Theory
• A precise measurement of the direct CP violation parameter Re(epsilon'/epsilon)
• Order p^6 chiral couplings from the scalar K Pi form factor

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