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We discuss the link between the chiral symmetry of QCD and the numericalresults of the light-front quark model (LFQM), analyzing both the two-point andthree-point functions of a pseudoscalar meson from the perspective of thevacuum fluctuation consistent with the chiral symmetry of QCD. The two-pointand three-point functions are exemplified in this work by the twist-2 andtwist-3 distribution amplitudes of a pseudoscalar meson and the pion elasticform factor, respectively. The present analysis of the pseudoscalar mesoncommensurates with the previous analysis of the vector meson two-point functionand fortifies our observation that the light-front quark model with effectivedegrees of freedom represented by the constituent quark and antiquark mayprovide the view of effective zero-mode cloud around the quark and antiquarkinside the meson. Consequently, the constituents dressed by the zero-mode cloudmay be expected to satisfy the chiral symmetry of QCD. Our results appearconsistent with this expectation and effectively indicate that the constituentquark and antiquark in the LFQM may be considered as the dressed constituentsincluding the zero-mode quantum fluctuations from the vacuum.

Consistency of the light-front quark model with chiral symmetry in the pseudoscalar meson analysis