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

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

1998-10-05

arxiv.org/abs/hep-ph/9810254v1

Phys.Rev.D59:073002,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages including 9 figures

Scientific paper

10.1103/PhysRevD.59.073002

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^4) in the small-momentum expansion, and the O(p^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^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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