Leading-twist pion and kaon distribution amplitudes in the gauge-invariant nonlocal chiral quark model from the instanton vacuum

Abstract

We investigate the leading-twist light-cone distribution amplitudes for the pion and kaon based on the gauge-invariant nonlocal chiral quark model from the instanton vacuum in the presence of external axial-vector currents. We find that the nonlocal contribution from the gauge invariance has much effects on the pion distribution amplitudes, while it changes mildly the kaon ones. We also study the Gegenbauer moments of the distribution amplitudes and compare them with the empirical analysis of the CLEO data.

14 pages, 10 figures

References in corpus (2)

• The leading-twist pion and kaon distribution amplitudes from the QCD instanton vacuum
• Magnetic susceptibility of the QCD vacuum

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• Spin structure of the pion from the instanton vacuum
• Covariant Non-local Chiral Quark Model and Pion-photon Transition Distribution Amplitudes
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• Kaon Electromagnetic Form Factor within the $k_T$ Factorization Formalism and It's Light-Cone Wave Function
• Exclusive processes $e^{+}{e}^{-}\to VP$ in $k_T$ factorization
• Loop corrections to pion and kaon neutrinoproduction