2004/10/08 by A. P. Bakulev, Alexander P. Bakulev, Bakulev, Alexander P.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0410134
Talk presented at the 13th International Seminar on High Energy Physics ``Quarks-2004'', Pushkinskie Gory, Russia, May 24-30, 2004; 9pages, 6 figures
arxiv created 2004/10/08 · openalex publication_date 2004/10/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In my talk I discuss the theoretical and experimental status of the pion distribution amplitude (DA). I show that the QCD sum rule method with nonlocal condensates (NLC) for the pion DA gives us admissible sets (bunches) of DAs for each value of QCD-vacuum nonlocality parameter λq. Comparing these bunches with the new CLEO constraints, obtained in the NLO light-cone sum-rule analysis of γ^*γ→π-transition form factor, allows us to fix the value of QCD vacuum nonlocality λq2≃0.4 GeV2. Then I show that the corresponding bunch of pion DAs agrees well with the E791 data on diffractive dijet production and with the JLab F(pi) data on the pion electromagnetic form factor. The latter comparison is made in the framework of analytic perturbation theory with non-power NLO for the pion form factor, where scale-setting ambiguities are strongly reduced already at the NLO level.