First Measurement of the Gerasimov-Drell-Hearn Sum Rule for 1H from 0.7 to 1.8 GeV at ELSA.

H Dutz,W Weihofen,G Reicherz,N D’Hose,M Schumacher,I Preobrajenski,A Thomas,R Kondratiev,P Pedroni,C Bradtke,H Holvoet,P Grabmayr,J Harmsen,A Panzeri,R Van De Vyver,G Anton,A Braghieri,T Pinelli,B Kiel,J Ahrens,T Iwata,G Zeitler,D Menze,W Hillert,P Jennewein,B Lannoy,S Hasegawa,R Beck,F Frommberger,T Speckner,S Altieri,R Leukel,W Meyer,N Horikawa,G Tamas,K Helbing,J Krimmer,V Lisin,T Rostomyan,F Zapadtka,J Naumann,B Schoch,E Heid,J R M Annand,Michelle Sauer ,Andreas Böck ,W Von Drachenfels ,Luc Van Hoorebeke ,M Gódo ,Kurt Schaldemose Hansen ,Μ Lang ,Ch Rohlof ,Stefan Goertz ,Edgar Radtke ,Ф Клейн ,H J Arends ,Thilo Michel

doi:10.1103/physrevlett.91.192001

First Measurement of the Gerasimov-Drell-Hearn Sum Rule for 1H from 0.7 to 1.8 GeV at ELSA.

H Dutz, W Weihofen + Show 55 more

https://doi.org/10.1103/physrevlett.91.192001

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Journal: Physical Review Letters	Publication Date: Nov 4, 2003
Citations: 80

Affiliation: University of Bonn, University of Göttingen, Ruhr University Bochum, Johannes Gutenberg University Mainz, Ghent University, University of Tübingen, University of Erlangen-Nuremberg, Nagoya University, University of Glasgow

#Photon Energy Range #Tagged Photon Facility + Show 8 more

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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)] microb.

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