Charge Symmetry Breaking and Parity Violating Electron-Proton Scattering

Abstract

Charge symmetry breaking contributions to the proton's neutral weak form factors must be understood in order for future measurements of parity violating electron-proton scattering to be definitively interpreted as evidence of proton strangeness. We calculate these charge symmetry breaking form factor contributions using chiral perturbation theory with resonance saturation estimates for unknown low-energy constants. The uncertainty of the leading-order resonance saturation estimates is reduced by incorporating nuclear physics constraints. Higher-order contributions are investigated through phenomenological vertex form factors. We predict that charge symmetry breaking form factor contributions are an order of magnitude larger than expected from naive dimensional analysis but are still an order of magnitude smaller than current experimental bounds on proton strangeness. This is consistent with previous calculations using chiral perturbation theory with resonance saturation.

17 pages, 5 figures; typos corrected, all results unchanged

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Cited by in corpus (9)

• On the pi pi continuum in the nucleon form factors and the proton radius puzzle
• Constraining nucleon strangeness
• Determination of the strange nucleon form factors
• Isospin splittings in the decuplet baryon spectrum from dynamical QCD+QED
• Chiral Effective Theory Methods and their Application to the Structure of Hadrons from Lattice QCD
• Charge Symmetry Violation in the Electromagnetic Form Factors of the Proton
• Charge Symmetry Breaking in Electromagnetic Nucleon Form Factors in Elastic Parity-Violating Electron-Nucleus Scattering
• Charge symmetry violation in the determination of strangeness form factors
• Ernest Henley's Isospin and the Ensuing Progress