Measurement of Proton Spin Structure Functions in the Resonance Region

Details Measurement of Proton Spin Structure Functions in the Resonance Region Measurement of Proton Spin Structure Functions in the Resonance Region

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apru10005m&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The double polarization asymmetry A_ep(W,Q^2) and the polarized structure function g_1(x,Q^2) have been measured throughout the nucleon resonance region and into the deep inelastic regime, for a range Q^2 = 0.15 -1.25 GeV^2. The contributions to the first moment Γ_1(Q^2) = int(g_1(x,Q^2)dx have been determined and, using a parametrization for g1 in the unmeasured low x regions, the complete first moment has been estimated over this Q^2 region. A rapid change of the first moment is observed at Q^2 <= 1 GeV^2, with a sign change near Q^2 = 0.25 GeV^2, indicating dominant contributions from the resonance region. At the highest Q^2 values our results are compared to the pQCD evolution of Γ_1(Q^2) to order α_s^3, and show significant disagreement. Better agreement is obtained with a model that implements nucleon resonances explicitly. The measurements were done at Jefferson Lab with CLAS using a longitudinally polarized ^15NH3 target and a polarized electron beam at 2.6 GeV and 4.3 GeV beam energy.

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