On a QCD-based pion distribution amplitude vs. recent experimental data
A. P. Bakulev, S. V. Mikhailov, N. G. Stefanis
Abstract
Using QCD sum rules with nonlocal condensates the twist-2 pion distribution amplitude is determined by means of its moments and their confidence intervals, including also radiative corrections. An admissible set of pion distribution amplitudes is constructed in the a2, a4 plane of the Gegenbauer polynomial expansion coefficients. The determined a2, a4 region strongly overlaps with that extracted from the CLEO data by Schmedding and Yakovlev. Comparisons are given with results from Fermilab experiment E791 and recent lattice calculations.
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