Precision Measurement of the Proton and Deuteron Spin Structure Functions g{sub 2} and Asymmetry A{sub 2} [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: vp : digital, PDF file
Additional Creators:: Stanford Linear Accelerator Center, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

We have measured the spin structure functions g₂{sup p} and g₂{sup d} and the virtual photon asymmetries A₂{sup p} and A₂{sup d} 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 d₂{sup p} 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 < √(R(1+A₁)/2) limit.

Report Numbers:

E 1.99:slac-pub-8813
slac-pub-8813

Subject(s):

Physics Of Elementary Particles And Fields

Other Subject(s):

Note:

Published through SciTech Connect.
04/24/2002.
"slac-pub-8813"
Rock, Stephen.

Type of Report and Period Covered Note:

Topical;

Funding Information:

AC03-76SF00515

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