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

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

2006-10-11

arxiv.org/abs/hep-ex/0610032v2

Phys.Rev.D74:092006,2006; Erratum-ibid.D75:119902,2007

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2006/

Scientific paper

10.1103/PhysRevD.74.092006

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 the $\eta'$ 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, and thus an explanation outside the realm of the Standard Model or an improved understanding of non-perturbative QCD effects may be needed to account for this large rate.

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