Experimental check of the Gerasimov-Drell-Hearn sum rule for H-1

ISSN
0031-9007
Date Issued
2004
Author(s)
Dutz, H.
Helbing, Krister
Krimmer, J.
Speckner, T.
Zeitler, G.
Ahrens, J.
Altieri, S.
Annand, JRM
Anton, G.
Arends, H. J.
Beck, R.
Bock, A.
Bradtke, C.
Braghieri, A.
von Drachenfels, W.
Frommberger, F.
Godo, M.
Goertz, S.
Grabmayr, P.
Hasegawa, S.
Hansen, K.
Harmsen, J.
Heid, E.
Hillert, W.
Holvoet, H.
Horikawa, N.
Iwata, T.
van Hoorebeke, L.
d'Hose, N.
Jennewein, P.
Kiel, B.
Klein, F.
Kondratiev, R.
Lang, M.
Lannoy, B.
Leukel, R.
Lisin, V.
Menze, D.
Meyer, Werner
Michel, Tanja Maria
Naumann, J.
Panzeri, A.
Pedroni, P.
Pinelli, T.
Preobrajenski, I.
Radtke, E.
Reicherz, G.
Rohlof, C.
Rostomyan, T.
Schoch, B.
Schumacher, M.
Tamas, Gabor
Thomas, Andy
van de Vyver, R.
Weihofen, W.
Zapadtka, F.
DOI
10.1103/PhysRevLett.93.032003
Abstract
For the first time we checked the fundamental Gerasimov-Drell-Hearn (GDH) sum rule for the proton experimentally in the photon energy range from 0.2-2.9 GeV with the tagged photon facilities at MAMI (Mainz) and ELSA (Bonn). New data of the doubly polarized total cross section difference are presented in the energy range from 1.6 to 2.9 GeV. The contribution to the GDH integral from 0.2-2.9 GeV yields [254+/-5(stat)+/-12(syst)] mub with negative contributions in the Regge regime at photon energies above 2.1 GeV. This trend supports the validity of the GDH sum rule.