SLAC Experiment E159

Proposal to Measure DeltaSigma(gamma,N)(k) and the High

Energy Contribution to the Gerasimov-Drell-Hearn Sum Rule

Experiment E159 (approved 9 November 2000 by the SLAC EPAC) is a measurement of the spin-dependent total cross section for circularly polarized photons absorbed on longitudinally polarized protons and neutrons in the photon energy range 5 to 40 GeV. This will be the first measurement of the difference between left- and right-handed polarized photoproduction above the resonance region. These data will be used to
  • learn about the high energy convergence of the fundamental Gerasimov-Drell-Hearn sum rule for the proton and neutron.
  • provide a baseline for understanding of soft Regge physics, essential to the interpretation of data taken with virtual photons.

General Information
Information for Collaborators

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Peter Bosted
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Last updated: 22 May 2001