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

HERMES Collaboration

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60 Citations (Web of Science)

Abstract

The virtual photon absorption cross section differences [alpha(1/2) - alpha(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 H-1 and He-3 internal gas targets. The data were collected in the region above the nucleon resonances in the kinematic range v < 23.5 GeV and 0.8 GeV2 < Q(2) < 12 GeV2. 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. (C) 1998 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)531-538
Number of pages8
JournalPhysics Letters B
Volume444
Issue number3-4
DOIs
Publication statusPublished - 24 Dec 1998
Externally publishedYes

Keywords

  • SPIN STRUCTURE-FUNCTION
  • STRUCTURE-FUNCTION G(1)(N)
  • RESONANCE REGION
  • POLARIZED HE-3
  • PARTON MODEL
  • SUM-RULES
  • E-P
  • SCATTERING
  • NUCLEON

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