Polarizabilities of the nucleon and spin dependent photo-absorption

Abstract

The polarizabilities $\alpha$ (electric), $\beta$ (magnetic) and ${\gamma }_{\pi }$ (backward spin) of the nucleon are investigated in terms of degrees of freedom of the nucleon using recent results for the CGLN amplitudes and resonance couplings $A_{1/2}$ and $A_{3/2}$. The photon excitation strengths of the excited states are given in terms of partial integrated photoabsorption cross sections and resonant contributions of the Gerasimov-Drell-Hearn (GDH) sum rule. As a test of the present predictions, cross section differences $({\sigma }_{3/2}-{\sigma }_{1/2})$ of the excited states are compared with data recently measured at MAMI (Mainz) and ELSA (Bonn), In order to explain differences between proton and neutron, radiative widths of the excited states are compared with nonrelativistic and relativistic predictions based on the SU(6) harmonic oscillator (HO) quark model, A complete list of partial contributions from the s-channel and the $t$-channel are given for the polarizabilities.

References in corpus (4)

• Unitary Isobar Model - MAID2007
• The sigma -> gamma gamma Width from Nucleon Electromagnetic Polarizabilities
• Hypercentral Constituent Quark Model with a Meson Cloud
• Note on the magnetic moment of the nucleon

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• Structure of the nucleon and spin-polarizabilities
• Nambu's Nobel Prize, the $\sigma$ meson and the mass of visible matter
• Hyperon forward spin polarizabilty gamma0
• Dispersion theory of nucleon polarizabilities and outlook on chiral effective field theory
• Conference Report: Structure of scalar mesons and the Higgs sector of strong interaction