Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-25
Phys.Lett.B698:140-145,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 8 figures
Scientific paper
10.1016/j.physletb.2011.02.056
We include effects of nonlocal quark condensates into QCD sum rules (QSR) via the K$\ddot{\mathrm{a}}$ll$\acute{\mathrm{e}}$n-Lehmann representation for a dressed fermion propagator, in which a negative spectral density function manifests their nonperturbative nature. Applying our formalism to the pion form factor as an example, QSR results are in good agreement with data for momentum transfer squared up to $Q^2 \approx 10 $ GeV$^2$. It is observed that the nonlocal quark condensate contribution descends like $1/Q^2$, different from the exponential decrease in $Q^2$ obtained in the literature, and contrary to the linear rise in the local-condensate approximation.
Hsieh Ron-Chou
Li Hsiang-nan
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