The electric dipole form factor of the nucleon in chiral perturbation theory to sub-leading order

E. Mereghetti, J. de Vries, W. H. Hockings, C. M. Maekawa, Ubirajara Van Kolck

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45 Scopus citations


The electric dipole form factor (EDFF) of the nucleon stemming from the QCD θ̄ term and from the quark color-electric dipole moments is calculated in chiral perturbation theory to sub-leading order. This is the lowest order in which the isoscalar EDFF receives a calculable, non-analytic contribution from the pion cloud. In the case of the θ̄ term, the expected lower bound on the deuteron electric dipole moment is |dd|≳1.4. 10-4θ̄e fm. The momentum dependence of the isovector EDFF is proportional to a non-derivative time-reversal-violating pion-nucleon coupling, and the scale for momentum variation-appearing, in particular, in the radius of the form factor-is the pion mass.

Original languageEnglish (US)
Pages (from-to)97-102
Number of pages6
JournalPhysics Letters B
Issue number1-2
Publication statusPublished - Jan 24 2011



  • Chiral perturbation theory
  • Nucleon electric dipole form factor
  • Nucleon electric dipole moment
  • QCD theta term
  • Quark chromo-electric dipole moment
  • Time reversal violation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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