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

Författare:
  • 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 Hasegawa
  • Kurt 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
Publiceringsår: 2003
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review Letters
Volym: 91
Nummer: 19: 192001
Dokumenttyp: Artikel
Förlag: American Physical Society

Sammanfattning

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.

Disputation

Nyckelord

  • Physics and Astronomy

Övrigt

Published
Yes
  • ISSN: 0031-9007

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