0000000000364821
AUTHOR
M. De Sanctis
Relativistic corrections to the Drell-Hearn-Gerasimov sum rule in the constitutent quark model
Relativistic corrections have been calculated for the Drell-Hearn-Gerasimov sum rule in the framework of the constituent-quark model. These corrections lead to additional absorption strength due to relativistic dipole currents in the case of a hyperfine interaction. The introduction of anomalous magnetic moments requires a subtraction of the dispersion integral at infinity. The additional effects of such anomalous moments, however, are numerically very small within the model.
First overview on the 4th Annex I Habitats Report in Italy: methods, criticality, results and future prospects
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A phenomenological quark current for the study of the polarized structure function of the nucleon
In the context of the quark model, a phenomenological expression for the electromagnetic interaction is derived in order to study the polarized structure function of the nucleon. The DHG value without hyperfine corrections and the asymptotic behaviour are reproduced.