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High Energy Physics - Phenomenology

arXiv:hep-ph/0511192 (hep-ph)
[Submitted on 16 Nov 2005 (v1), last revised 10 Feb 2006 (this version, v2)]

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

Authors:S. S. Agaev
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Abstract: 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.
Comments: 15 pages, 7 figures. Numerical errors in $Φ_4^{(4)}(u)$ (Eq.(3.9)), and in $ϕ_4^1(u)$, ρ_4^4(t,s), H_4^4(t)$ (Appendix) corrected. The figures and Section IV revised. Conclusions changed
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:hep-ph/0511192
  (or arXiv:hep-ph/0511192v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0511192
Journal reference: Phys.Rev.D72:114010,2005; Erratum-ibid.D73:059902,2006
Related DOI: https://doi.org/10.1103/PhysRevD.72.114010 https://doi.org/10.1103/PhysRevD.73.059902

Submission history

From: Shahin Agaev [view email]
[v1] Wed, 16 Nov 2005 09:08:13 UTC (117 KB)
[v2] Fri, 10 Feb 2006 11:30:31 UTC (118 KB)
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