First measurement of the Gerasimov-Drell-Hearn sum rule for H-1 from 0.7 to 1.8 GeV at ELSA

H Dutz, K Helbing, J Krimmer, T Speckner, G Zeitler, J Ahrens, S Altieri, JRM Annand, G Anton, HJ Arends, R Beck, A Bock, C Bradtke, A Braghieri, W von Drachenfels, F Frommberger, M Godo, S Goertz, P Grabmayr, S HasegawaKurt Hansen, J Harmsen, E Heid, W Hillert, H Holvoet, N Horikawa, T Iwata, LV Hoorebeke, N d'Hose, P Jennewein, B Kiel, F Klein, R Kondratiev, M Lang, B Lannoy, R Leukel, V Lisin, D Menze, W Meyer, T Michel, J Naumann, A Panzeri, P Pedroni, T Pinelli, I Preobrajenski, E Radtke, G Reicherz, C Rohlof, T Rostomyan, M Sauer, B Schoch, M Schumacher, G Tamas, A Thomas, R van de Vyver, W Weihofen, F Zapadtka

Research output: Contribution to journalArticlepeer-review

Abstract

To verify the fundamental Gerasimov-Drell-Hearn (GDH) sum rule for the first time experimentally, we measured the helicity dependent total photoabsorption cross section with circularly polarized real photons and longitudinally polarized nucleons in the photon energy range 0.68-1.82 GeV with the tagged photon facility at ELSA. The experiment was carried out with a 4pi detection system, a circularly polarized tagged photon beam, and a frozen spin polarized proton target. The contribution to the GDH sum rule in this photon energy range is [49.9+/-2.4(stat)+/-2.2(syst)] mub.
Original languageEnglish
JournalPhysical Review Letters
Volume91
Issue number19: 192001
DOIs
Publication statusPublished - 2003

Subject classification (UKÄ)

  • Natural Sciences
  • Physical Sciences

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