Measurement of the proton and deuteron spin structure functions g(2) and asymmetry A(2)

Citation
Pl. Anthony et al., Measurement of the proton and deuteron spin structure functions g(2) and asymmetry A(2), PHYS LETT B, 458(4), 1999, pp. 529-535
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
458
Issue
4
Year of publication
1999
Pages
529 - 535
Database
ISI
SICI code
0370-2693(19990715)458:4<529:MOTPAD>2.0.ZU;2-E
Abstract
We have measured the spin structure functions g(2)(p) and g(2)(d) and the v irtual photon asymmetries A(2)(p) and A(2)(d) over the kinematic range 0.02 less than or equal to x less than or equal to 0.8 and 1.0 less than or equ al to Q(2) less than or equal to 30 (GeV/c)(2) by scattering 38.8 GeV longi tudinally polarized electrons from transversely polarized NH3 and (LiD)-Li- 6 targets. The absolute value of A(2) is significantly smaller than the roo t R positivity limit over the measured range, while g(2) is consistent with the twist-2 Wandzura-Wilczek calculation. We obtain results for the twist- 3 reduced matrix elements d(2)(p), d(2)(d) and d(2)(n). The Burkhardt-Cotti ngham sum rule integral integral g(2)(x)dx is reported for the range 0.02 l ess than or equal to x less than or equal to 0.8, (C) 1999 Elsevier Science B.V. All rights reserved.