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

Aquines, O.; Li, Z.; Lopez, A.; Mehrabyan, S.; Mendez, H.; Ramirez, J.; Huang, G.S.; Miller, David Harry; Pavlunin, V.; Sanghi, B.

doi:10.1103/PhysRevD.75.119902

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

CLEO

Collaboration

•

O. Aquines
(
- Puerto Rico U., Mayaguez
)

Oct, 2006

13 pages

Published in:

Phys.Rev.D 74 (2006) 092006,
Phys.Rev.D 75 (2007) 119902 (erratum)

e-Print:

hep-ex/0610032 [hep-ex]

DOI:

PDG:

{{\mathit \Upsilon}{(1S)}}

\rightarrow

{{\mathit \eta}^{\,'}{(958)}}

anything

Report number:

CLNS-06-1970,
CLEO-06-15

Experiments:

CESR-CLEO

View in:

ADS Abstract Service

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reference search4 citations

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Abstract: (arXiv)

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.

Note:

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

13.66.Bc
13.25.Gv
13.25.Hw
electron positron: colliding beams
electron positron: annihilation
Upsilon(9460): electroproduction
Upsilon(9460): hadronic decay
coupling: (eta(958) 2gluon)
quantum chromodynamics: perturbation theory
form factor: momentum transfer dependence

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