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Using the CLEO II detector at CESR, we measure the eta' - gluon - gluonform-factor in Y(1S) decays. This form-factor especially at large eta' energiesmay provide an explanation of the large rate for B -> Xs eta'. Our data do notsupport a large anomalous coupling at higher q^2 and thus the large eta' rateremains a mystery, possibly requiring a non-Standard Model explanation.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Inclusiveη′production from theΥ(1S)