dorsal/arxiv
View SchemaElectron-deuteron scattering in the equal-time formalism: beyond the impulse approximation
| Authors | D. R. Phillips, S. J. Wallace, N. K. Devine |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0411092 |
| URL | https://arxiv.org/abs/nucl-th/0411092 |
| DOI | 10.1103/PhysRevC.72.014006 |
| Journal | Phys.Rev.C72:014006,2005 |
Abstract
Using a three-dimensional formalism that includes relativistic kinematics, the effects of negative-energy states, approximate boosts of the two-body system, and current conservation, we calculate the electromagnetic form factors of the deuteron up to Q^2 of 4 GeV^2. This is done using a dynamical boost for two-body systems with spin. We first compute form factors in impulse approxmation, but then also add an isoscalar meson-exchange current of pion range that involves the gamma-pi contact operator associated with pseudovector pi-N coupling. We also consider effects of the rho-pi-gamma meson-exchange current. The experimentally measured quantities A, B, and t20 are calculated over the kinematic range probed in recent Jefferson Laboratory experiments. The rho-pi-gamma meson-exchange current provides significant strength in A at large Q^2 and the gamma-pi contact-term exchange current shifts t20, providing good agreement with the JLab data. Relativistic effects and the gamma-pi meson-exchange current do not provide an explanation of the B observable, but the rho-pi-gamma current could help to provide agreement if a nonstandard value is used for the tensor rho-N coupling that enters this contribution.
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"abstract": "Using a three-dimensional formalism that includes relativistic kinematics,\nthe effects of negative-energy states, approximate boosts of the two-body\nsystem, and current conservation, we calculate the electromagnetic form factors\nof the deuteron up to Q^2 of 4 GeV^2. This is done using a dynamical boost for\ntwo-body systems with spin. We first compute form factors in impulse\napproxmation, but then also add an isoscalar meson-exchange current of pion\nrange that involves the gamma-pi contact operator associated with pseudovector\npi-N coupling. We also consider effects of the rho-pi-gamma meson-exchange\ncurrent. The experimentally measured quantities A, B, and t20 are calculated\nover the kinematic range probed in recent Jefferson Laboratory experiments. The\nrho-pi-gamma meson-exchange current provides significant strength in A at large\nQ^2 and the gamma-pi contact-term exchange current shifts t20, providing good\nagreement with the JLab data. Relativistic effects and the gamma-pi\nmeson-exchange current do not provide an explanation of the B observable, but\nthe rho-pi-gamma current could help to provide agreement if a nonstandard value\nis used for the tensor rho-N coupling that enters this contribution.",
"arxiv_id": "nucl-th/0411092",
"authors": [
"D. R. Phillips",
"S. J. Wallace",
"N. K. Devine"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.72.014006",
"journal_ref": "Phys.Rev.C72:014006,2005",
"title": "Electron-deuteron scattering in the equal-time formalism: beyond the impulse approximation",
"url": "https://arxiv.org/abs/nucl-th/0411092"
},
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