Baryon electric dipole moments from strong CP violation
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- Guo, F. & Meißner, U. J. High Energ. Phys. (2012) 2012: 97. doi:10.1007/JHEP12(2012)097
The electric dipole form factors and moments of the ground state baryons are calculated in chiral perturbation theory at next-to-leading order. We show that the baryon electric dipole form factors at this order depend only on two combinations of low-energy constants. We also derive various relations that are free of unknown low-energy constants. We use recent lattice QCD data to calculate all baryon EDMs. In particular, we find dn = −2.9 ± 0.9 and dp = 1.1 ± 1.1 in units of 10−16e θ0 cm. Finite volume corrections to the electric dipole moments are also worked out. We show that for a precision extraction from lattice QCD data, the next-to-leading order terms have to be accounted for.