Spin Dependent Parton Distributions in a Bound Nucleon

Abstract

The determination of the spin distribution functions for the neutron requires an understanding of the changes induced by a nuclear medium. We present the first estimates of the changes induced in the spin-dependent, valence parton distributions of the proton and neutron bound in ${}^3$He and ${}^6$Li. For ${}^3$He the result is quite reassuring, in that the off-shell correction to $g_{1n}$ is very small. On the other hand, in ${}^6$Li the corrections to the spin distributions in the bound proton are sufficiently large that they should be taken into account if one aims for a precision of better than 10%. We provide a simple parametrization of the off-shell changes in the valence spin distributions of ${}^3$He and ${}^6$Li, which can be used with any conventional estimate of nuclear binding and Fermi motion corrections.

10 pages, 4 ps figures. Version to appear in Phys. Lett. B. A sentence was added

References in corpus (3)

• Spin Structure of the Proton from Polarized Inclusive Deep-Inelastic Muon-Proton Scattering
• The Validity of Charge Symmetry for Parton Distributions
• Quark and gluon condensates in the quark-meson coupling model

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