Inclusive eta' Production from the Upsilon(1S)

Abstract

Using the CLEO II detector at CESR, we measure the eta' - gluon - gluon form-factor in Y(1S) decays. This form-factor especially at large eta' energies may provide an explanation of the large rate for B -> Xs eta'. Our data do not support a large anomalous coupling at higher q^2 and thus the large eta' rate remains a mystery, possibly requiring a non-Standard Model explanation.

14 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, submitted to PRD