# Power corrections to the pion transition form factor from higher-twist distribution amplitudes of photon

## TL;DR

This paper calculates power-suppressed contributions from higher-twist photon distribution amplitudes to the pion transition form factor, highlighting their significance at low momentum transfer and implications for pion LCDA parameters.

## Contribution

It introduces a detailed analysis of twist-4 photon LCDAs' impact on the pion transition form factor using light-cone sum rules, emphasizing the importance of these corrections.

## Key findings

- Three-particle twist-4 LCDAs contribute significantly at low Q^2.
- Power corrections affect the extraction of pion Gegenbauer moments.
- Inclusion of these corrections improves theoretical predictions.

## 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 $1/Q^2$, so that the power corrections considered in this work can give rise to a sizable contribution, especially at low $Q^2$ 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.