Determination of the deep inelastic contribution to the generalized Gerasimov-Drell-Hearn integral for the proton and neutron

The virtual photon absorption cross section differences [sigma_1/2-sigma_3/2] for the proton and neutron have been determined from measurements of polarised cross section asymmetries in deep inelastic scattering of 27.5 GeV longitudinally polarised positrons from polarised 1H and 3He internal gas targets. The data were collected in the region above the nucleon resonances in the kinematic range nu < 23.5 GeV and 0.8 GeV**2 < Q**2 < 12 GeV**2. For the proton the contribution to the generalised Gerasimov-Drell-Hearn integral was found to be substantial and must be included for an accurate determination of the full integral. Furthermore the data are consistent with a QCD next-to-leading order fit based on previous deep inelastic scattering data. Therefore higher twist effects do not appear significant.

Note:

6 pages, 3 figures, 1 table, revtex Report-no: DESY 98-122

positron p: deep inelastic scattering
positron nucleus: deep inelastic scattering
positron: polarized beam
helium: nuclide
polarized target: internal
exchange: one-photon
photon nucleon: absorption
cross section: difference
sum rule: Drell-Hearn-Gerasimov
energy dependence

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