Title of article :
Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2
Author/Authors :
E155 Collaboration، نويسنده , , P.L. Anthony، نويسنده , , R.G. Arnold، نويسنده , , T. Averett، نويسنده , , H.R. Band، نويسنده , , N. Benmouna، نويسنده , , W. Boeglin، نويسنده , , H. Borel، نويسنده , , P.E. Bosted، نويسنده , , S.L. Bültmann، نويسنده , , G.R. Court، نويسنده , , D. Crabb، نويسنده , , D. Day، نويسنده , , P. Decowski، نويسنده , , P. DePietro، نويسنده , , H. Egiyan، نويسنده , , R. Erbacher، نويسنده , , R. Erickson، نويسنده , , R. Fatemi، نويسنده , , E. Frlez، نويسنده , , et al.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
7
From page :
18
To page :
24
Abstract :
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 0.7⩽Q2⩽20 GeV2 by scattering 29.1 and 32.3 GeV longitudinally polarized electrons from transversely polarized NH3 and 6LiD targets. Our measured 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 within our measured kinematic range. The absolute value of A2 is significantly smaller than the A2
Journal title :
PHYSICS LETTERS B
Serial Year :
2003
Journal title :
PHYSICS LETTERS B
Record number :
916536
Link To Document :
