Journal
PHYSICAL REVIEW D
Volume 79, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.79.093010
Keywords
-
Funding
- Deutsche Forschungsgemeinschaft [DFG 436 RUS 113/881/0]
- Heisenberg-Landau Program [2009]
- DAAD MichailLomonosov-Forschungsstipendium
- Russian Foundation for Fundamental Research [07-0291557, 08-01-00686, 09-02-01149]
- BRFBR-JINR Cooperation Program [F08D-001]
Ask authors/readers for more resources
We present a detailed investigation of the spacelike pion's electromagnetic form factor using three-point QCD sum rules that exclusively involve nonlocal condensates. Our main methodological tools are a spectral density which includes O(alpha(s)) corrections, a suitably improved Gaussian ansatz to model the distribution of the average momentum of quarks in the QCD vacuum, and a perturbative scheme that avoids Landau singularities. Using this framework, we obtain predictions for the pion form factor together with error estimates originating from intrinsic theoretical uncertainties owing to the perturbative expansion and the nonperturbative method applied. We also discuss our results in comparison with other calculations, in particular, with those following from the AdS/QCD correspondence. We find good agreement of our predictions with measurements in the range of momenta covered by the existing experimental data between 1 and 10 GeV2.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available