A Comprehensive Analysis on the Pion-Photon Transition Form Factor Beyond the Leading Fock State

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dc.creatorHuang, Tao
dc.creatorWu, Xing-Gang
dc.date2006-06-12
dc.date2006-11-02
dc.date.accessioned2026-07-07T10:41:43Z
dc.date.available2026-07-07T10:41:43Z
dc.descriptionWe perform a comprehensive analysis of the pion-photon transition form factor $F_{πγ}(Q^2)$ involving the transverse momentum corrections with the present CLEO experimental data, in which the contributions beyond the leading Fock state have been taken into consideration. As is well-known, the leading Fock-state contribution dominates of $F_{πγ}(Q^2)$ at large momentum transfer ($Q^2$) region. One should include the contributions beyond the leading Fock state in small $Q^2$ region. In this paper, we construct a phenomenological expression to estimate the contributions beyond the leading Fock state based on its asymptotic behavior at $Q^2\to0$. Our present theoretical results agree well with the experimental data in the whole $Q^2$ region. Then, we extract some useful information of the pionic leading twist-2 distribution amplitude (DA) by comparing our results of $F_{πγ}(Q^2)$ with the CLEO data. By taking best fit, we have the DA moments, $a_2(μ_0^2)=0.002^{+0.063}_{-0.054}$, $a_4(μ_0^2)=-0.022_{-0.012}^{+0.026}$ and all of higher moments, which are closed to the asymptotic-like behavior of the pion wavefunction.
dc.description25 pages, 7 figures. Typo error corrected
dc.identifierhttps://arxiv.org/abs/hep-ph/0606135
dc.identifierhttp://arxiv.org/abs/hep-ph/0606135
dc.identifierInt.J.Mod.Phys.A22:3065-3086,2007
dc.identifierdoi:10.1142/S0217751X07036671
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181714
dc.subjectHigh Energy Physics - Phenomenology
dc.titleA Comprehensive Analysis on the Pion-Photon Transition Form Factor Beyond the Leading Fock State
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