




Item type: | Article | ||||
---|---|---|---|---|---|
Journal or Publication Title: | Physics Letters B | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
Place of Publication: | AMSTERDAM | ||||
Volume: | 494 | ||||
Number of Issue or Book Chapter: | 1-2 | ||||
Page Range: | pp. 1-8 | ||||
Date: | 2000 | ||||
Institutions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer | ||||
Identification Number: |
| ||||
Keywords: | POLARIZED STRUCTURE FUNCTIONS; DEEP-INELASTIC SCATTERING; STRUCTURE FUNCTIONS G(1); SUM-RULE; SPIN STRUCTURE; RADIATIVE-CORRECTIONS; MUON SCATTERING; NUCLEON; NEUTRON; PARTICLES; deep inelastic scattering; sum rules; asymmetries; photoabsorption | ||||
Dewey Decimal Classification: | 500 Science > 530 Physics | ||||
Status: | Published | ||||
Refereed: | Yes, this version has been refereed | ||||
Created at the University of Regensburg: | Yes | ||||
Item ID: | 74014 |
Abstract
The dependence on Q(2) (the negative square of the 4-momentum of the exchanged virtual photon) of the generalised Gerasimov-Drell-Hearn integral for the proton has been measured in the range 1.2 GeV2 < Q(2) < 12 GeV2 by scattering longitudinally polarised positrons on a longitudinally polarised hydrogen gas target. The contributions of the nucleon-resonance and deep inelastic regions to this ...

Abstract
The dependence on Q(2) (the negative square of the 4-momentum of the exchanged virtual photon) of the generalised Gerasimov-Drell-Hearn integral for the proton has been measured in the range 1.2 GeV2 < Q(2) < 12 GeV2 by scattering longitudinally polarised positrons on a longitudinally polarised hydrogen gas target. The contributions of the nucleon-resonance and deep inelastic regions to this integral have been evaluated separately. The latter has been found to dominate for Q(2) > 3 GeV2, while both contributions are important at low Q(2). The total integral shows no significant deviation from a 1/Q(2) behaviour in the measured Q(2) range, and thus no sign of large effects due to either nucleon-resonance excitations or nonleading twist. (C) 2000 Elsevier Science B.V. All rights reserved.
Metadata last modified: 19 Dec 2024 15:56