Higher twist distribution amplitudes of the pion and electromagnetic form factor $F_π(Q^2)$

Details Higher twist distribution amplitudes of the pion and electromagnetic form factor $F_π(Q^2)$ Higher twist distribution amplitudes of the pion and electromagnetic form factor $F_π(Q^2)$

2005-09-29

arxiv.org/abs/hep-ph/0509345v2

Phys.Rev. D72 (2005) 074020

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 7 figures; the version to appear in Phys.Rev. D

Scientific paper

10.1103/PhysRevD.72.074020

The pion electromagnetic form factor is calculated within the QCD light-cone sum rule method and using a renormalon model for the higher twist distribution amplitudes (DAs). The theoretical predictions are compared with the experimental data and constraints on the pion leading and twist-4 DAs are extracted. An upper bound on the twist-4 contribution to the form factor and estimates of effects due to higher conformal spins in the pion twist-4 DAs are obtained.

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