Impact of the higher twist effects on the $γγ^{*} \to π^{0}$ transition form factor

Details Impact of the higher twist effects on the $γγ^{*} \to π^{0}$ transition form factor Impact of the higher twist effects on the $γγ^{*} \to π^{0}$ transition form factor

2005-11-16

arxiv.org/abs/hep-ph/0511192v2

Phys.Rev. D72 (2005) 114010; Erratum-ibid. D73 (2006) 059902

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 7 figures. Numerical errors in $\Phi_4^{(4)}(u)$ (Eq.(3.9)), and in $\phi_4^1(u)$, \rho_4^4(t,s), H_4^4(t)$ (Appendi

Scientific paper

10.1103/PhysRevD.72.114010

We reanalyze the $\gamma\gamma^{*} \to \pi^{0}$ transition form factor $F_{\pi\gamma}(Q^2)$ within the QCD light-cone sum rules method with the twist-4 accuracy. In computations the pion leading twist distribution amplitude (DA) with two nonasymptotic terms, and the renormalon method-inspired twist-4 DAs are used. The latters allow us to estimate impact of effects due to higher conformal spin components in the pion twist-4 DAs on the form factor $F_{\pi\gamma}(Q^2)$. Obtained theoretical predictions are employed to deduce constraints on the pion DAs from CELLO and CLEO data.

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