dorsal/arxiv
View SchemaMany-Body Currents and the Strange-Quark Content of 4he
| Authors | M. J. Musolf, R. Schiavilla, T. W. Donnelly |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9405012 |
| URL | https://arxiv.org/abs/nucl-th/9405012 |
| DOI | 10.1103/PhysRevC.50.2173 |
| Journal | Phys.Rev.C50:2173-2188,1994 |
Abstract
Meson-exchange current (MEC) contributions to the parity-violating (PV) asymmetry for elastic scattering of polarized electrons from $^4$He are calculated over a range of momentum transfer using Monte Carlo methods and a variational $^4$He ground state wavefunction. The results indicate that MEC's generate a negligible contribution to the asymmetry at low-$|\qv|$, 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 $\rho$-$\pi$ \lq\lq 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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"abstract": "Meson-exchange current (MEC) contributions to the parity-violating (PV)\nasymmetry for elastic scattering of polarized electrons from $^4$He are\ncalculated over a range of momentum transfer using Monte Carlo methods and a\nvariational $^4$He ground state wavefunction. The results indicate that MEC\u0027s\ngenerate a negligible contribution to the asymmetry at low-$|\\qv|$, where a\ndetermination of the nucleon\u0027s mean square strangeness radius could be carried\nout at CEBAF. At larger values of momentum transfer -- beyond the first\ndiffraction minimum -- two-body corrections from the $\\rho$-$\\pi$ \\lq\\lq\nstrangeness charge\" operator enter the asymmetry at a potentially observable\nlevel, even in the limit of vanishing strange-quark matrix elements of the\nnucleon. For purposes of constraining the nucleon\u0027s strangeness electric form\nfactor, theoretical uncertainties associated with these MEC contributions do\nnot appear to impose serious limitations.",
"arxiv_id": "nucl-th/9405012",
"authors": [
"M. J. Musolf",
"R. Schiavilla",
"T. W. Donnelly"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.50.2173",
"journal_ref": "Phys.Rev.C50:2173-2188,1994",
"title": "Many-Body Currents and the Strange-Quark Content of 4he",
"url": "https://arxiv.org/abs/nucl-th/9405012"
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