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

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.