1303.3156 (W. Dekens et al.)

Renormalization Group Running of Dimension-Six Sources of Parity and
Time-Reversal Violation    [PDF]

W. Dekens, J. de Vries

We perform a systematic study of flavor-diagonal parity- and time-reversal violating operators of dimension six which could arise from physics beyond the SM. We begin at the unknown high-energy scale where these operators originate. At this scale the operators are constrained by gauge invariance which has important consequences for the form of effective operators at lower energies. In particular for the four-quark operators. We calculate one-loop QCD and, when necessary, electroweak corrections to the operators and evolve them down to the electroweak scale and subsequently to hadronic scales. We find that for most operators QCD corrections are not particularly significant. We derive a set of operators at low energy which is expected to dominate hadronic and nuclear EDMs due to physics beyond the SM and obtain quantitative relations between these operators and the original dimension-six operators at the high-energy scale. We use the limit on the neutron EDM to set bounds on the dimension-six operators.

View original: http://arxiv.org/abs/1303.3156