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Measurement of the Deuteron Spin Structure Function g_1^d(x) for 1 (GeV/c)^2 < Q^2 < 40 (GeV/c)^2

E155 Collaboration

Abstract

New measurements are reported on the deuteron spin structure function g_1^d. These results were obtained from deep inelastic scattering of 48.3 GeV electrons on polarized deuterons in the kinematic range 0.01 < x < 0.9 and 1 < Q^2 < 40 (GeV/c)^2. These are the first high dose electron scattering data obtained using lithium deuteride (6Li2H) as the target material. Extrapolations of the data were performed to obtain moments of g_1^d, including Gamma_1^d, and the net quark polarization Delta Sigma.

Measurement of the Deuteron Spin Structure Function g_1^d(x) for 1 (GeV/c)^2 < Q^2 < 40 (GeV/c)^2

Abstract

New measurements are reported on the deuteron spin structure function g_1^d. These results were obtained from deep inelastic scattering of 48.3 GeV electrons on polarized deuterons in the kinematic range 0.01 < x < 0.9 and 1 < Q^2 < 40 (GeV/c)^2. These are the first high dose electron scattering data obtained using lithium deuteride (6Li2H) as the target material. Extrapolations of the data were performed to obtain moments of g_1^d, including Gamma_1^d, and the net quark polarization Delta Sigma.

Paper Structure

This paper contains 4 equations, 2 figures.

Figures (2)

  • Figure 1: Values of $g_{1}^{d} / F_{1}^{d}$ vs. Q$^{2}$ at various values of $x$ for this experiment (filled circles), E143 (open circles), and SMC (open boxes). The inner bars are statistical uncertainties, while the outer bars include systematic errors added in quadrature. The curves are our parameterized fit (short-dashed), the E154 NLO fit E154 (solid), and the SMC NLO fit (long-dashed) SMCNLO.
  • Figure 2: Values of $xg_{1}^{d}$ (a) and $g_{1}^{d}$ (b) evolved to Q$^{2}$ of 5 (GeV/c)$^{2}$ using Eq. \ref{['EQ4']}. The symbols and curves are as in Fig. \ref{['fig:q2dep']}.