Generalized polarizabilities and electroexcitation of the nucleon |
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| Institution: | 1. Key Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, PR China;2. Department of Chemistry, Abdul Wali Khan University, Mardan, Khyber Pakhtunkhwa, 23200, Pakistan;1. ICTEAM Institute UCLouvain Louvain-la-Neuve, Belgium;2. Center for operations research and econometrics UCLouvain Louvain-la-Neuve, Belgium |
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| Abstract: | Generalized nucleon polarizabilities for virtual photons can be defined in terms of electroproduction cross sections as function of the 4-momentum transfer Q2. In particular, the sum of the generalized electric and magnetic polarizabilities Σ=α+β and the spin polarizability γ can be expressed by virtual photon absorption cross sections integrated over the excitation energy. These quantities have been calculated within the framework of the recently developed unitary isobar model for pion photo- and electroproduction on the proton, which describes the available experimental data up to an excitation energy of about 1 GeV. Our results have been compared to the predictions of chiral perturbation theory. |
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