How reliable are bound-state parameters obtained from QCD sum rules?

Details How reliable are bound-state parameters obtained from QCD sum rules? How reliable are bound-state parameters obtained from QCD sum rules?

2008-11-05

arxiv.org/abs/0811.0721v1

PoS Confinement8:106,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the 8-th Conference "Quark Confinement and the Hadron Spectrum", Mainz, Germany, 1-6 September 2008

Scientific paper

We discuss the extraction of ground-state parameters, such as decay constants and form factors, from two- and three-point dispersive sum rules, making use of a quantum-mechanical potential model. This model provides a unique possibility to probe the reliability and the accuracy of the method of sum rules: one obtains the bound-state parameters by the standard procedures adopted in sum rules, and compares these results with the exact values, known in the potential model. We demonstrate the presence of uncontrollable uncertainties in the ground-state parameters obtained from sum rules and estimate their magnitude. The uncontrolled uncertainties in ground-state form factors are shown to be typically much larger than those in the decay constants. In the example presented, the uncontrolled systematic error in the extracted form factor is found to exceed the 10% level.

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