2006/07/25 by O. Aquines, Aquines, O., CLEO Collaboration +1
Medicine · Physics and Astronomy · #Advanced MRI Techniques and Applications #Advanced Neuroimaging Techniques and Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0607056
13 pages postscript,also available through http://www.lepp.cornell.edu/public/CONF/2006, Contributed to ICHEP06
arxiv created 2006/07/25 · openalex publication_date 2006/07/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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' Xs 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.