First measurement of the Gerasimov-Drell-Hearn integral for Hydrogen from 200 to 800 MeV

Details First measurement of the Gerasimov-Drell-Hearn integral for Hydrogen from 200 to 800 MeV First measurement of the Gerasimov-Drell-Hearn integral for Hydrogen from 200 to 800 MeV

2001-05-31

arxiv.org/abs/hep-ex/0105089v2

Phys.Rev.Lett.87:022003,2001

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 3 figures, 3 tables

Scientific paper

10.1103/PhysRevLett.87.022003

A direct measurement of the helicity dependence of the total photoabsorption cross section on the proton was carried out at MAMI (Mainz) in the energy range 200 < E_gamma < 800 MeV. The experiment used a 4$\pi$ detection system, a circularly polarized tagged photon beam and a frozen spin target. The contributions to the Gerasimov-Drell-Hearn sum rule and to the forward spin polarizability $\gamma_0$ determined from the data are 226 \pm 5 (stat)\pm 12(sys) \mu b and -187 \pm 8 (stat)\pm 10(sys)10^{-6} fm^4, respectively, for 200 < E_\gamma < 800 MeV.

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