Ke3 Decay Studies in the OKA Experiment
Fields, Particles, and Nuclei
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Abstract
Recent results from OKA setup concerning form factor studies in Ke3 decay are presented. About 5.25 M events obtained for decays of 17.7 GeV/cK+ are selected for the analysis. The linear and quadratic slopes for the decay form factor f+(t) are measured: λ+ = 2.95 ± 0.022 ± 0.018 × 10-2 for the linear slope fit and λ'+ = (2.611 ± 0.035 ± 0.028) × 10-2, λ"+ = (1.91 ± 0.19 ± 0.14) × 10-3 for the quadratic one. The scalar and tensor contributions are compatible with zero. Several alternative parametrizations are tried: the Pole fit parameter is found to be M V = 891 ± 3 MeV; the parameter of the dispersive parametrization is measured to be Λ+ = (2.458 ± 0.018) × 10-2.
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