a Measurement of Ξ0 Beta Decay by NA48/1 and the Extraction of VUS

Details a Measurement of Ξ0 Beta Decay by NA48/1 and the Extraction of VUS a Measurement of Ξ0 Beta Decay by NA48/1 and the Extraction of VUS

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iche.conf.1040j&link_type=abstract

HIGH ENERGY PHYSICS, ICHEP 2004. Proceedings of the 32nd International Conference. Held 16-22 August 2004 in Beijing, China. Edi

Physics

High Energy Physics

Scientific paper

A large sample of Ξ0 decays was collected by the NA48/1 collaboration at the CERN SPS accelerator during a high-intensity KS and hyperon run in 2002. Clean signals for the semileptonic decays Ξ 0 -> Σ + e- bar {ν }e and Ξ 0 -> Σ + μ - bar {ν }μ have been obtained. The measurement of the Ξ 0 -> Σ + e- bar {ν }e branching ratio has been used to extract Vus. This measurement is of special interest because recent results on Vus obtained mostly from "Ke3" decays of neutral and charged kaons (K → πeν), in combination with measured values for Vud seemed to be in conflict with the unitarity condition of the CKM matrix.

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