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The spin transfer from vertically polarized beam protons to Lambda or Sigmahyperons of the associated strangeness production pp -> pK Lambda (Sigma) isdescribed with the depolarization coefficient D_NN. As the polarization of thehyperons is determined by their weak decays, detectors, which have a largeacceptance for the decay particles, are needed. In this paper a formula isderived, which describes the depolarization coefficient D_NN by count rates ofa 4 pi detector. It is shown, that formulas, which are given in publicationsfor detectors with restricted acceptance, are specific cases of this formulafor a 4 pi detector.

Extracting the depolarization coefficient D_NN from data measured with a full acceptance detector