New SMC Measurements of the Spin Structure of the Deuteron.
Abstract
During the SPS running period in 1995 the Spin Muon Collaboration (SMC) has accumulated data for a measurement of the spin-dependent structure function g^d_1(x) of the deuteron from the deep inelastic scattering of longitudinally polarized muons off longitudinally polarized deuterons. For these measurements the energy of the incident muons was 190 GeV and the average polarization of the deuteron nuclei in beads of deuterated butanol was 55%. The particular purpose of the 1995 SMC run was to improve the statistics for the measurement of g^d1 (x) at low x. In 1992 and 1994 SMC obtained g^d_1(x) data with incident polarized muons of 100 GeV and 190 GeV, respectively. The individual g^d1 (x, Q^2) measurements are evolved to a common, fixed Q^2_0. These g^d1 (x,Q^2_0) values are then used in combination with previous measurements for g^d_1(x) and g^p_1(x) to test the Bjorken Sum rule for Γ^p - Γ^n, and to extract a value for Δ Σ, the summed quark contribution to the nucleon spin, as well as the individual contributions Δ u, Δ d and Δ s. In the 1995 run some data were also taken with the deuteron target polarized transverse to the beam direction. These measurements place limits on the asymmetry A^d2 (x) and the spin-dependent structure function g^d_2(x).
- Publication:
-
APS Meeting Abstracts
- Pub Date:
- May 1996
- Bibcode:
- 1996APS..MAY..C104W