Discrete symmetries on the light front and a general relation connecting the nucleon electric dipole and anomalous magnetic moments

Stanley J. Brodsky, Susan Gardner, Dae Sung Hwang

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We consider the electric dipole form factor, F3(q2), as well as the Dirac and Pauli form factors, F1(q2) and F2(q2), of the nucleon in the light-front formalism. We derive an exact formula for F3(q2) to complement those known for F1(q2) and F2(q2). We derive the light-front representation of the discrete symmetry transformations and show that time-reversal- and parity-odd effects are captured by phases in the light-front wave functions. We thus determine that the contributions to F2(q2) and F3(q2), Fock state by Fock state, are related, independent of the fundamental mechanism through which CP violation is generated. Our relation is not specific to the nucleon, but, rather, is true of spin-1/2 systems in general, be they lepton or baryon. The empirical values of the anomalous magnetic moments, in concert with empirical bounds on the associated electric dipole moments, can better constrain theories of CP violation. In particular, we find that the neutron and proton electric dipole moments echo the isospin structure of the anomalous magnetic moments, κn∼-κp.

Original languageEnglish
Article number036007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume73
Issue number3
DOIs
StatePublished - 2006

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Fingerprint

Dive into the research topics of 'Discrete symmetries on the light front and a general relation connecting the nucleon electric dipole and anomalous magnetic moments'. Together they form a unique fingerprint.

Cite this