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- W2086576618 abstract "We calculate the scalar, axial, and pseudoscalar charges of the quark in the Schwinger-Dyson formalism of Landau gauge QCD. It is found that the dressed quark-scalar density of the valence quark is significantly enhanced against the bare-quark contribution, and the result explains qualitatively the phenomenologically known value of the pion-nucleon sigma term and also that given by lattice QCD. Moreover, we show that the Richardson's interquark potential suppresses the quark-scalar density in the Higashjima-Miransky approximation. This fact suggests that the quark-scalar density is an observable that is sensitive to quark confinement. For the quark axial charge, we find that it is suppressed due to the gluon dynamics. The result of the quenched analysis agrees qualitatively with the experimental data of the isovector axial coupling constant ${g}_{A}$. We show that the suppression of the quenched axial charge is due to a mechanism similar to that of the quark tensor charge. In the Schwinger-Dyson equation with the leading unquenching quark-loop contribution the quark axial charge is more suppressed, due to the anomaly effect. The quark pseudoscalar density is found to be large, and is divergent as the bare quark becomes massless. This result is in agreement with the phenomenological current algebraic analysis, and explains well the dominance of the pion-pole contribution." @default.
- W2086576618 created "2016-06-24" @default.
- W2086576618 creator A5005965790 @default.
- W2086576618 creator A5037439086 @default.
- W2086576618 creator A5066048704 @default.
- W2086576618 creator A5068962321 @default.
- W2086576618 date "2014-04-07" @default.
- W2086576618 modified "2023-09-23" @default.
- W2086576618 title "Quark scalar, axial, and pseudoscalar charges in the Schwinger-Dyson formalism" @default.
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