First Measurement of the Tensor Structure Function $b_1$ of the Deuteron

Abstract

The \Hermes experiment has investigated the tensor spin structure of the deuteron using the 27.6 GeV/c positron beam of \Hera. The use of a tensor polarized deuteron gas target with only a negligible residual vector polarization enabled the first measurement of the tensor asymmetry $\At$ and the tensor structure function $\bd$ for average values of the Bjørken variable $0.01<<x><0.45$ and of the squared four-momentum transfer $0.5\mathrm{Ge}{\mathrm{V}}^2<<Q^2><5\mathrm{Ge}{\mathrm{V}}^2$. The quantities $\At$ and $\bd$ are found to be non-zero. The rise of $\bd$ for decreasing values of $x$ can be interpreted to originate from the same mechanism that leads to nuclear shadowing in unpolarized scattering.

References in corpus (11)

• The HERMES Spectrometer
• Quark helicity distributions in the nucleon for up, down, and strange quarks from semi--inclusive deep--inelastic scattering
• Precision Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetries A2
• Phenomenology of the Deuteron Electromagnetic Form Factors
• The HERMES Polarized Hydrogen and Deuterium Gas Target in the HERA Electron Storage Ring
• Nonvanishing tensor polarization of sea quarks in polarized deuterons
• The Double Scattering Contribution to $b_1(x,Q^2)$ in the Deuteron
• Polarized deuteron structure functions at small x
• Deuteron Spin Structure Functions at Small Bjorken-x
• Tensor Analyzing Powers for Quasi-Elastic Electron Scattering from Deuterium
• Relativistic Calculation of Structure Functions b_{1,2}(X) of the Deuteron

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