Based on the Dyson–Schwinger equations of QCD in the 'rainbow' approximation, the fully dressed quark propagator is investigated, and then an algebraic parametrization form of the propagator is obtained as a...Based on the Dyson–Schwinger equations of QCD in the 'rainbow' approximation, the fully dressed quark propagator is investigated, and then an algebraic parametrization form of the propagator is obtained as a solution of the equations. The dressed quark amplitudes and built up the fully dressed quark propagator and the dynamical running masses defined by and for light quarks u, d and s are calculated, respectively. Using the predicted running masses , quark condensates for u, d quarks, and for s quark, and experimental pion decay constant , the masses of Goldstone bosons K, π, and η are also evaluated. The numerical results show that the masses of quarks are dependent on their momentum . The fully dressed quark amplitudes and have correct behaviors which can be used for many purposes in our future researches on nonperturbative QCD.展开更多
Based on our low energy QCD Lagrangian description of strange meson photoproduction off the proton and the crossing symmetry, the strange meson radiative capture on the proton, , is investigated in the quark model of...Based on our low energy QCD Lagrangian description of strange meson photoproduction off the proton and the crossing symmetry, the strange meson radiative capture on the proton, , is investigated in the quark model of baryon structure with the same input parameter, the only strong coupling constant , as that in the strange meson photoproduction off the proton , a crossing channel of the capture reaction. A good agreement on the branching ratio between the predictions and data is obtained successfully. This excellent fit indicates that our low energy QCD Lagrangian theory with only one free parameter is an advanced and unified description of strange meson photoproduction and its associated radiative capture.展开更多
Based on the [SUSF(6) O(3)]sym SUc(3) quark model, we study transverse transition form factors fromthe nucleon to nucleonic excitation states △(1232), N* (1535), and N* (1680). The transition form factors GT(Q2) arec...Based on the [SUSF(6) O(3)]sym SUc(3) quark model, we study transverse transition form factors fromthe nucleon to nucleonic excitation states △(1232), N* (1535), and N* (1680). The transition form factors GT(Q2) arecalculated with a realistic and relativistic electromagnetic interaction. Therefore, a fit to experimental data examinesto what extent the constituent quark model is workable. The comparison between theoretical results and experimentaldata shows that the constituent quark model cannot provide a successful description of the transitions.展开更多
文摘Based on the Dyson–Schwinger equations of QCD in the 'rainbow' approximation, the fully dressed quark propagator is investigated, and then an algebraic parametrization form of the propagator is obtained as a solution of the equations. The dressed quark amplitudes and built up the fully dressed quark propagator and the dynamical running masses defined by and for light quarks u, d and s are calculated, respectively. Using the predicted running masses , quark condensates for u, d quarks, and for s quark, and experimental pion decay constant , the masses of Goldstone bosons K, π, and η are also evaluated. The numerical results show that the masses of quarks are dependent on their momentum . The fully dressed quark amplitudes and have correct behaviors which can be used for many purposes in our future researches on nonperturbative QCD.
文摘Based on our low energy QCD Lagrangian description of strange meson photoproduction off the proton and the crossing symmetry, the strange meson radiative capture on the proton, , is investigated in the quark model of baryon structure with the same input parameter, the only strong coupling constant , as that in the strange meson photoproduction off the proton , a crossing channel of the capture reaction. A good agreement on the branching ratio between the predictions and data is obtained successfully. This excellent fit indicates that our low energy QCD Lagrangian theory with only one free parameter is an advanced and unified description of strange meson photoproduction and its associated radiative capture.
文摘Based on the [SUSF(6) O(3)]sym SUc(3) quark model, we study transverse transition form factors fromthe nucleon to nucleonic excitation states △(1232), N* (1535), and N* (1680). The transition form factors GT(Q2) arecalculated with a realistic and relativistic electromagnetic interaction. Therefore, a fit to experimental data examinesto what extent the constituent quark model is workable. The comparison between theoretical results and experimentaldata shows that the constituent quark model cannot provide a successful description of the transitions.
