Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-10-08
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk presented at the 13th International Seminar on High Energy Physics ``Quarks-2004'', Pushkinskie Gory, Russia, May 24-30,
Scientific paper
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 \lambda_q. Comparing these bunches with the new CLEO constraints, obtained in the NLO light-cone sum-rule analysis of \gamma^*\gamma\to\pi-transition form factor, allows us to fix the value of QCD vacuum nonlocality \lambda_q^2\simeq0.4 GeV^2. 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.
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