The $Q^2$-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron
| dc.creator | HERMES collaboration | |
| dc.creator | Airapetian, A. | |
| dc.date | 2002-10-18 | |
| dc.date.accessioned | 2026-07-07T13:03:49Z | |
| dc.date.available | 2026-07-07T13:03:49Z | |
| dc.description | The Gerasimov-Drell-Hearn (GDH) sum rule connects the anomalous contribution to the magnetic moment of the target nucleus with an energy-weighted integral of the difference of the helicity-dependent photoabsorption cross sections. The data collected by HERMES with a deuterium target are presented together with a re-analysis of previous measurements on the proton. This provides a measurement of the generalised GDH integral covering simultaneously the nucleon-resonance and the deep inelastic scattering regions. The contribution of the nucleon-resonance region is seen to decrease rapidly with increasing $Q^2$. The DIS contribution is sizeable over the full measured range, even down to the lowest measured $Q^2$. As expected, at higher $Q^2$ the data are found to be in agreement with previous measurements of the first moment of $g_1$. From data on the deuteron and proton, the GDH integral for the neutron has been derived and the proton--neutron difference evaluated. This difference is found to satisfy the fundamental Bjorken sum rule at $Q^2 = 5$ GeV$^2$. | |
| dc.description | 12 pages, 10 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0210047 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0210047 | |
| dc.identifier | Eur.Phys.J.C26:527-538,2003 | |
| dc.identifier | doi:10.1140/epjc/s2002-01118-x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/226940 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | The $Q^2$-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron | |
| dc.type | text |