Precision Measurement of the Proton and Deuteron Spin Structure Functions g2
Abstract
We measured the spin structure functions g2p and g2d in the range 0.02≤ x ≤ 0.8 and 0.7 ≤ Q2 ≤ 20 GeV2 by scattering 29.1 and 32.3 GeV longitudinally polarized electrons from transversely polarized NH3 and 6{LiD} targets. g2 approximately follows the twist-2 Wandzura-Wilczek calculation. The twist-3 reduced matrix elements d2p and d2n are less than two standard deviations from zero. The data are inconsistent with the Burkhardt-Cottingham sum rule if there is no pathological behavior as x → 0. The Efremov-Leader-Teryaev integral is consistent with zero.
- Publication:
-
Acta Physica Polonica B
- Pub Date:
- November 2002
- Bibcode:
- 2002AcPPB..33.3677R