Axial exchange currents and the spin content of the nucleon
| dc.creator | Barquilla-Cano, D. | |
| dc.creator | Buchmann, A. J. | |
| dc.creator | Hernandez, E. | |
| dc.date | 2003-03-10 | |
| dc.date | 2003-03-11 | |
| dc.date.accessioned | 2026-07-07T05:39:31Z | |
| dc.date.available | 2026-07-07T05:39:31Z | |
| dc.description | In a chiral quark model where chiral symmetry is introduced via a non-linear sigma model, we evaluate the axial couplings g_A(0), g_A^8(0) and g_A^0(0 )related to the spin structure of the nucleon. Our calculation includes one-body and two-body axial current and pion absorption operators, which satisfy the Partial Conservation of Axial Current (PCAC) condition. While g_A(0) is dominated by the one-body axial current we find significant corrections due to two-body axial exchange currents in g_A^8(0) and g_A^0(0). Interestingly, the axial current associated with gluon exchange reduces g_A^8(0) from 1 to 0.6. Our analysis shows that the so-called ``proton spin crisis'' can be resolved in a constituent quark model in which PCAC is satisfied. Furthermore, we use the PCAC constraint in order to determine the couplings of the eta and eta' mesons to nucleons. | |
| dc.description | 30 pages, 3 figures | |
| dc.identifier | https://arxiv.org/abs/nucl-th/0303020 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/0303020 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/81993 | |
| dc.subject | Nuclear Theory | |
| dc.title | Axial exchange currents and the spin content of the nucleon | |
| dc.type | text |