The Q2 -dependence of the generalised Gerasimov-Drell-Hearn integral for the proton


Journal Article

The dependence on Q2 (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 < Q2 < 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 Q2 > 3 GeV2, while both contributions are important at low Q2. The total integral shows no significant deviation from a 1/Q2 behaviour in the measured Q2 range, and thus no sign of large effects due to either nucleon-resonance excitations or nonleading twist. (C) 2000 Elsevier Science B.V.

Full Text

Duke Authors

Cited Authors

  • Airapetian, A; Akopov, N; Akushevich, I; Amarian, M; Arrington, J; Aschenauer, EC; Avakian, H; Avakian, R; Avetissian, A; Avetissian, E; Bailey, P; Bains, B; Baumgarten, C; Beckmann, M; Belostotski, S; Bernreuther, S; Bianchi, N; Böttcher, H; Borissov, A; Bouwhuis, M; Brack, J; Brauksiepe, S; Braun, B; Brückner, W; Brüll, A; Budz, P; Bulten, HJ; Capitani, GP; Carter, P; Chumney, P; Cisbani, E; Shibata, TA

Published Date

  • November 23, 2000

Published In

Volume / Issue

  • 494 / 1-2

Start / End Page

  • 1 - 8

International Standard Serial Number (ISSN)

  • 0370-2693

Digital Object Identifier (DOI)

  • 10.1016/S0370-2693(00)01111-4

Citation Source

  • Scopus