Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-03-12
Phys.Lett. B508 (2001) 279-289; Erratum-ibid. B590 (2004) 309-310
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages in RevTeX; 5 figures as EPS files; one citation added in Ref. [24]; published in Phys. Lett. B; Erratum added; No cha
Scientific paper
10.1016/S0370-2693(01)00517-2
We use QCD sum rules with nonlocal condensates to re-calculate more accurately the moments and their confidence intervals of the twist-2 pion distribution amplitude including radiative corrections. We are thus able to construct an admissible set of pion distribution amplitudes which define a reliability region in the $a_{2}$, $a_{4}$ plane of the Gegenbauer polynomial expansion coefficients. We emphasize that models like that of Chernyak and Zhitnitsky, as well as the asymptotic solution, are excluded from this set. We show that the determined $a_{2}$, $a_{4}$ region strongly overlaps with that extracted from the CLEO data by Schmedding and Yakovlev and that this region is also not far from the results of the first direct measurement of the pion valence quark momentum distribution by the Fermilab E791 collaboration. Comparisons with recent lattice calculations and instanton-based models are briefly discussed.
Bakulev Alexander P.
Mikhailov S. V.
Stefanis N. G.
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