Timelike and spacelike electromagnetic form factors of nucleons, a unified description
The extended Lomon-Gari-Krümpelmann model of nucleon electromagnetic form factors, which embodies ρ, ρ′, ω, ω′, and ϕ vector meson contributions and the perturbative QCD high momentum transfer behavior has been extended to the timelike region. Breit-Wigner formulas with momentum-dependent widths hav...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/72143 https://orcid.org/0000-0002-6695-1824 |
| _version_ | 1826201387480907776 |
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| author | Lomon, Earle L. Paceti, Simone |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Lomon, Earle L. Paceti, Simone |
| author_sort | Lomon, Earle L. |
| collection | MIT |
| description | The extended Lomon-Gari-Krümpelmann model of nucleon electromagnetic form factors, which embodies ρ, ρ′, ω, ω′, and ϕ vector meson contributions and the perturbative QCD high momentum transfer behavior has been extended to the timelike region. Breit-Wigner formulas with momentum-dependent widths have been considered for broad resonances in order to have a parametrization for the electromagnetic form factors that fulfills, in the timelike region, constraints from causality, analyticity, and unitarity. This analytic extension of the Lomon-Gari-Krümpelmann model has been used to perform a unified fit to all the nucleon electromagnetic form factor data, in the spacelike and timelike region (where form factor values are extracted from e+e-↔NN̅ cross sections data). The knowledge of the complete analytic structure of form factors enables predictions at extended momentum transfer, and also of timelike observables such as the ratio between electric and magnetic form factors and their relative phase. |
| first_indexed | 2024-09-23T11:51:13Z |
| format | Article |
| id | mit-1721.1/72143 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:51:13Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/721432022-10-01T06:27:03Z Timelike and spacelike electromagnetic form factors of nucleons, a unified description Lomon, Earle L. Paceti, Simone Massachusetts Institute of Technology. Center for Theoretical Physics Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Lomon, Earle L. Lomon, Earle L. The extended Lomon-Gari-Krümpelmann model of nucleon electromagnetic form factors, which embodies ρ, ρ′, ω, ω′, and ϕ vector meson contributions and the perturbative QCD high momentum transfer behavior has been extended to the timelike region. Breit-Wigner formulas with momentum-dependent widths have been considered for broad resonances in order to have a parametrization for the electromagnetic form factors that fulfills, in the timelike region, constraints from causality, analyticity, and unitarity. This analytic extension of the Lomon-Gari-Krümpelmann model has been used to perform a unified fit to all the nucleon electromagnetic form factor data, in the spacelike and timelike region (where form factor values are extracted from e+e-↔NN̅ cross sections data). The knowledge of the complete analytic structure of form factors enables predictions at extended momentum transfer, and also of timelike observables such as the ratio between electric and magnetic form factors and their relative phase. 2012-08-15T15:55:54Z 2012-08-15T15:55:54Z 2012-06 2012-01 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1089-4918 http://hdl.handle.net/1721.1/72143 Lomon, Earle, and Simone Pacetti. “Timelike and Spacelike Electromagnetic Form Factors of Nucleons, a Unified Description.” Physical Review D 85.11 (2012): 113004. © 2012 American Physical Society. https://orcid.org/0000-0002-6695-1824 en_US http://dx.doi.org/10.1103/PhysRevD.85.113004 Physical Review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Lomon, Earle L. Paceti, Simone Timelike and spacelike electromagnetic form factors of nucleons, a unified description |
| title | Timelike and spacelike electromagnetic form factors of nucleons, a unified description |
| title_full | Timelike and spacelike electromagnetic form factors of nucleons, a unified description |
| title_fullStr | Timelike and spacelike electromagnetic form factors of nucleons, a unified description |
| title_full_unstemmed | Timelike and spacelike electromagnetic form factors of nucleons, a unified description |
| title_short | Timelike and spacelike electromagnetic form factors of nucleons, a unified description |
| title_sort | timelike and spacelike electromagnetic form factors of nucleons a unified description |
| url | http://hdl.handle.net/1721.1/72143 https://orcid.org/0000-0002-6695-1824 |
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