Isospin violation and the proton's neutral weak magnetic form factor

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The effects of isospin violation on the neutral weak magnetic form factor of the proton are studied using two-flavour chiral perturbation theory. The first nonzero contributions appear at O(p{sup 4}) in the small-momentum expansion, and the O(p{sup 5}) corrections are also calculated. The leading contributions from an explicit Delta(1232) isomultiplet are included as well. At such a high order in the chiral expansion, one might have expected a large number of unknown parameters to contribute. However, it is found that no unknown parameters can appear within loop diagrams, and a single tree-level counterterm at O(p{sup 4}) is sufficient to absorb ... continued below

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621 Kilobytes pages

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Lewis, Randy & Mobed, Nader October 1, 1998.

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The effects of isospin violation on the neutral weak magnetic form factor of the proton are studied using two-flavour chiral perturbation theory. The first nonzero contributions appear at O(p{sup 4}) in the small-momentum expansion, and the O(p{sup 5}) corrections are also calculated. The leading contributions from an explicit Delta(1232) isomultiplet are included as well. At such a high order in the chiral expansion, one might have expected a large number of unknown parameters to contribute. However, it is found that no unknown parameters can appear within loop diagrams, and a single tree-level counterterm at O(p{sup 4}) is sufficient to absorb all divergences. The momentum dependence of the neutral weak magnetic form factor is not affected by this counterterm.

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621 Kilobytes pages

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  • Journal Name: Phys.Rev. D59 (1999) 073002; Other Information: Submitted to Phys.Rev. D59 (1999) 073002

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  • Report No.: DOE/ER/40150-1514
  • Report No.: JLAB-THY-98-39
  • Report No.: hep-ph/9810254
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 755970
  • Archival Resource Key: ark:/67531/metadc711150

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 5, 2016, 8:13 p.m.

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Lewis, Randy & Mobed, Nader. Isospin violation and the proton's neutral weak magnetic form factor, article, October 1, 1998; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc711150/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.