Power corrections to the pion transition form factor from higher-twist distribution amplitudes of photon
Abstract
In this paper we investigate the power suppressed contributions from two-particle and three-particle twist-4 light-cone distribution amplitudes (LCDAs) of photon within the framework of light-cone sum rules. Compared with leading twist LCDA result, the contribution from three-particle twist-4 LCDAs is not suppressed in the expansion by 1/Q2, so that the power corrections considered in this work can give rise to a sizable contribution, especially at low Q2 region. According to our result, the power suppressed contributions should be included in the determination of the Gegenbauer moments of pion LCDAs with the pion transition form factor.
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