Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetry A2

Details Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetry A2 Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetry A2

1999-01-08

arxiv.org/abs/hep-ex/9901006v1

Phys.Lett.B458:529-535,1999

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, 4 figures, 1 table

Scientific paper

10.1016/S0370-2693(99)00590-0

We have measured the spin structure functions g2p and g2d and the virtual photon asymmetries A2p and A2d over the kinematic range 0.02 < x < 0.8 and 1.0 < Q^2 < 30(GeV/c)^2 by scattering 38.8 GeV longitudinally polarized electrons from transversely polarized NH3 and 6LiD targets.The absolute value of A2 is significantly smaller than the sqrt{R} positivity limit over the measured range, while g2 is consistent with the twist-2 Wandzura-Wilczek calculation. We obtain results for the twist-3 reduced matrix elements d2p, d2d and d2n. The Burkhardt-Cottingham sum rule integral - int(g2(x)dx) is reported for the range 0.02 < x < 0.8.

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