Isospin violation and the proton's neutral weak magnetic form factor
arXiv:hep-ph/9810254 · doi:10.1103/PhysRevD.59.073002
Abstract
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.
26 pages including 9 figures
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- The Nucleon Electric Dipole Form Factor From Dimension-Six Time-Reversal Violation
- Isospin violation in the vector form factors of the nucleon
- On the two-boson exchange corrections to parity-violating elastic electron-proton scattering
- Charge Symmetry Breaking and Parity Violating Electron-Proton Scattering
- Isospin breaking in the vector current of the nucleon
- Charge Symmetry Breaking and Parity Violating Electron Scattering
- Charge-symmetry-breaking nucleon form factors
- Charge symmetry violation in the determination of strangeness form factors