Pion Form Factor in QCD at Intermediate Momentum Transfers

Details Pion Form Factor in QCD at Intermediate Momentum Transfers Pion Form Factor in QCD at Intermediate Momentum Transfers

1999-07-26

arxiv.org/abs/hep-ph/9907495v2

Phys.Rev.D61:073004,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

to appear in Phys. Rev. D., one equation (Eq.(51) in old version) is eliminated and some new text added. None of the results a

Scientific paper

10.1103/PhysRevD.61.073004

We present a quantitative analysis of the electromagnetic pion form factor in the light-cone sum rule approach, including radiative corrections and higher-twist effects. The comparison to the existing data favors the asymptotic profile of the pion distribution amplitude and allows to estimate the deviation: $(\int du/u \phi_\pi(u))/ (\int du/u \phi^{\rm as}_\pi(u))=$ 1.1$\pm$ 0.1 at the scale 1 GeV. Special attention is payed to the precise definition and interplay of soft and hard contributions at intermediate momentum transfer, and to matching of the sum rule to the perturbative QCD prediction. We observe a strong numerical cancellation between the soft (end point) contribution and power suppressed hard contributions of higher twist, so that the total nonperturbative correction to the usual pQCD result turns out to be of order 30% for $Q^2\sim 1$ GeV$^2$.

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