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• W2022647412 abstract "The leading- and higher-twist distribution amplitudes and light-cone wave functions of real and virtual photons are analyzed in chiral quark models. The calculations are performed in the nonlocal quark model based on the instanton picture of QCD vacuum, as well as in the spectral quark model and the Nambu--Jona-Lasinio model with the Pauli-Villars regulator, which both treat interaction of quarks with external fields locally. We find that in all considered models the leading-twist distribution amplitudes of the real photon defined at the quark-model momentum scale are constant or remarkably close to the constant in the $x$ variable, thus are far from the asymptotic limit form. The QCD evolution to higher momentum scales is necessary and we carry it out at the leading order of the perturbative theory for the leading-twist amplitudes. We provide estimates for the magnetic susceptibility of the quark condensate $chi_m$ and the coupling $f_{3gamma}$, which in the nonlocal model turn out to be close to the estimates from QCD sum rules. We find the higher-twist distribution amplitudes at the quark model scale and compare them to the Wandzura-Wilczek estimates. In addition, in the spectral model we evaluate the distribution amplitudes and light-cone wave functions of the $rho$-meson." @default.
• W2022647412 created "2016-06-24" @default.
• W2022647412 creator A5049587086 @default.
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• W2022647412 date "2006-09-20" @default.
• W2022647412 modified "2023-09-23" @default.
• W2022647412 title "Photon distribution amplitudes and light-cone wave functions in chiral quark models" @default.
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• W2022647412 doi "https://doi.org/10.1103/physrevd.74.054023" @default.
• W2022647412 hasPublicationYear "2006" @default.
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