Improved Measurement of the Branching Fraction and Engery Spectrum of eta' from Upsilon(1S) Decays

Details Improved Measurement of the Branching Fraction and Engery Spectrum of eta' from Upsilon(1S) Decays Improved Measurement of the Branching Fraction and Engery Spectrum of eta' from Upsilon(1S) Decays

2006-07-25

arxiv.org/abs/hep-ex/0607056v1

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages postscript,also available through http://www.lepp.cornell.edu/public/CONF/2006, Contributed to ICHEP06

Scientific paper

We present an improved measurement of the eta' meson energy spectrum in Upsilon(1S) decays, using 1.2 fb^{-1}} of data taken at the Upsilon(1S) center-of-mass energy with the CLEO III detector. We compare our results with models of eta' gluonic form factor that have been suggested to explain the unexpectedly large B to eta' X_s rate. Models based on perturbative QCD fail to fit the data for large eta' energies, showing that Standard Model strong interaction dynamics is not likely to provide an explanation for the large rate of high energy eta' observed in B decays.

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