期刊
PHYSICAL REVIEW D
卷 78, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.034031
关键词
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资金
- Polish Ministry of Science and Higher Education [N202 034 32/0918, N202 249235]
- Spanish DGI
- FEDER [FIS2005-00810]
- Junta de Andalucia [FQM225-05]
- EU Integrated Infrastructure Initiative Hadron Physics [RII3-CT-2004-506078]
We present a construction of the pion electromagnetic form factor where the transition from large-N-c Regge vector-meson dominance models with infinitely many resonances to perturbative QCD is built in explicitly. The construction is based on an appropriate assignment of residues to the Regge poles, which fulfills the constraints of the parton-hadron duality and perturbative QCD. The model contains a slowly falling off nonperturbative contribution, which dominates over the perturbative QCD radiative corrections for the experimentally accessible momenta. The leading order and next-to-leading order calculations show a converging pattern that describes the available data within uncertainties, while the onset of asymptotic QCD takes place at extremely high momenta Q similar to 10(3)-10(4) GeV. The method can be straightforwardly extended to study other form factors where the perturbative QCD result is available.
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