Non-Standard Physics and Nucleon Strangeness in Low-Energy PV Electron Scattering

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Contributions from physics beyond the Standard Model, strange quarks in the nucleon, and nuclear structure effects to the left-right asymmetry measured in parity-violating (PV) electron scattering from 12C and the proton are discussed. It is shown how lack of knowledge of the distribution of strange quarks in the nucleon, as well as theoretical uncertainties associated with higher-order dispersion amplitudes and nuclear isospin-mixing, enter the extraction of new limits on the electroweak parameters S and T from these PV observables. It is found that a series of elastic PV electron scattering measurements using 4He could significantly constrain the s-quark electric form ... continued below

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page(s) 559-568

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Ramsey-Musolf, Michael & Donnelly, T. October 1, 1992.

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Contributions from physics beyond the Standard Model, strange quarks in the nucleon, and nuclear structure effects to the left-right asymmetry measured in parity-violating (PV) electron scattering from 12C and the proton are discussed. It is shown how lack of knowledge of the distribution of strange quarks in the nucleon, as well as theoretical uncertainties associated with higher-order dispersion amplitudes and nuclear isospin-mixing, enter the extraction of new limits on the electroweak parameters S and T from these PV observables. It is found that a series of elastic PV electron scattering measurements using 4He could significantly constrain the s-quark electric form factor if other theoretical issues are resolved. Such contraints would reduce the associated form factor uncertainty in the carbon and proton asymmetries below a level needed to permit extraction of interesting low-energy constraints on S and T from these observables. For comparison, the much smaller scale of s-quar

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page(s) 559-568

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  • Journal Name: Zeitschrift fuer Physik C; Journal Volume: 57

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  • Report No.: CEBAF-TH-92-29
  • Report No.: hep-ph/9212218
  • Report No.: CTP2149
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 954254
  • Archival Resource Key: ark:/67531/metadc928829

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Office of Scientific & Technical Information Technical Reports

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  • October 1, 1992

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 7, 2016, 6:21 p.m.

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Ramsey-Musolf, Michael & Donnelly, T. Non-Standard Physics and Nucleon Strangeness in Low-Energy PV Electron Scattering, article, October 1, 1992; [Newport News, Virginia]. (digital.library.unt.edu/ark:/67531/metadc928829/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.