Tuesday, October 23, 2012

1210.5887 (Feng-Kun Guo et al.)

Baryon electric dipole moments from strong CP violation    [PDF]

Feng-Kun Guo, Ulf-G. Meißner
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 d_n = -2.9\pm 0.9 and d_p = 1.1\pm 1.1 in units of 10^{-16} e \theta_0 cm. Finite volume corrections to the electric dipole form factors and 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.
View original: http://arxiv.org/abs/1210.5887

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