dorsal/arxiv
View SchemaThe Pion in Electromagnetic and Weak Neutral Current Nuclear Response Functions
| Authors | W. M. Alberico, M. B. Barbaro, A. De Pace, T. W. Donnelly, A. Molinari |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9304002 |
| URL | https://arxiv.org/abs/nucl-th/9304002 |
| DOI | 10.1016/0375-9474(93)90057-5 |
| Journal | Nucl. Phys. A563 (1993) 605 |
Abstract
The impact of pionic correlations and meson--exchange currents in determining the (vector) response functions for electroweak quasielastic lepton scattering from nuclei is discussed. The approach taken builds on previous work where the Fermi gas model is used to maintain consistency in treating forces and currents (gauge invariance) and to provide a Lorentz covariant framework. Results obtained in first-order perturbation theory are compared with infinite-order summation schemes (HF and RPA) and found to provide quite successful approximations for the quasielastic response functions. The role of pionic correlations in hardening the responses R_L and R_T is investigated in some detail, including studies of the relative importance of central and tensor pieces of the force and of exchange and self-energy diagrams; in addition, their role in significantly modifying the longitudinal parity-violating response R_{AV}^L is explored. The MEC are shown to provide a small, but non-negligible, contribution in determining the vector responses.
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"abstract": "The impact of pionic correlations and meson--exchange currents in determining\nthe (vector) response functions for electroweak quasielastic lepton scattering\nfrom nuclei is discussed. The approach taken builds on previous work where the\nFermi gas model is used to maintain consistency in treating forces and currents\n(gauge invariance) and to provide a Lorentz covariant framework. Results\nobtained in first-order perturbation theory are compared with infinite-order\nsummation schemes (HF and RPA) and found to provide quite successful\napproximations for the quasielastic response functions. The role of pionic\ncorrelations in hardening the responses R_L and R_T is investigated in some\ndetail, including studies of the relative importance of central and tensor\npieces of the force and of exchange and self-energy diagrams; in addition,\ntheir role in significantly modifying the longitudinal parity-violating\nresponse R_{AV}^L is explored. The MEC are shown to provide a small, but\nnon-negligible, contribution in determining the vector responses.",
"arxiv_id": "nucl-th/9304002",
"authors": [
"W. M. Alberico",
"M. B. Barbaro",
"A. De Pace",
"T. W. Donnelly",
"A. Molinari"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/0375-9474(93)90057-5",
"journal_ref": "Nucl. Phys. A563 (1993) 605",
"title": "The Pion in Electromagnetic and Weak Neutral Current Nuclear Response Functions",
"url": "https://arxiv.org/abs/nucl-th/9304002"
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