Hadron form factors from sum rules for vacuum-to-hadron correlators

Details Hadron form factors from sum rules for vacuum-to-hadron correlators Hadron form factors from sum rules for vacuum-to-hadron correlators

2008-10-24

arxiv.org/abs/0810.4497v1

Phys.Lett.B671:450-455,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages

Scientific paper

10.1016/j.physletb.2008.12.045

We analyse the extraction of the bound-state form factor from vacuum-to-hadron correlator, which is the basic object for the calculation of hadron form factors in the method of light-cone sum rules in QCD. We study this correlator in quantum mechanics, calculate it exactly, and derive the corresponding OPE. We then apply the standard procedures of QCD sum rules to isolate the ground-state form factor from this correlator. We demonstrate that fixing the effective continuum threshold, one of the key ingredients of the sum-rule calculation of bound-state parameters, poses a serious problem for sum rules based on vacuum-to-hadron correlators.

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