Many-Body Currents and the Strange-Quark Content of 4he
Abstract
Meson-exchange current (MEC) contributions to the parity-violating (PV) asymmetry for elastic scattering of polarized electrons from 4He are calculated over a range of momentum transfer using Monte Carlo methods and a variational 4He ground state wavefunction. The results indicate that MEC's generate a negligible contribution to the asymmetry at low-||, where a determination of the nucleon's mean square strangeness radius could be carried out at CEBAF. At larger values of momentum transfer -- beyond the first diffraction minimum -- two-body corrections from the -π strangeness charge" operator enter the asymmetry at a potentially observable level, even in the limit of vanishing strange-quark matrix elements of the nucleon. For purposes of constraining the nucleon's strangeness electric form factor, theoretical uncertainties associated with these MEC contributions do not appear to impose serious limitations.
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