Standard Model Prediction for Paramagnetic Electric Dipole Moments.

Standard model CP violation associated with the phase of the Cabibbo-Kobayashi-Maskawa quark mixing matrix is known to give small answers for the electric dipole moment (EDM) observables. Moreover, predictions for the EDMs of neutrons and diamagnetic atoms suffer from considerable uncertainties. We point out that the CP-violating observables associated with the electron spin (paramagnetic EDMs) are dominated by the combination of the electroweak penguin diagrams and ΔI=1/2 weak transitions in the baryon sector, and are calculable within chiral perturbation theory. The predicted size of the semileptonic operator C_{S} is 7×10^{-16}, which corresponds to the equivalent electron EDM d_{e}^{eq}=1.0×10^{-35} e cm. While still far from the current observational limits, this result is 3 orders of magnitude larger than previously believed.

Improved Indirect Limits on Muon Electric Dipole Moment.

Given current discrepancy in muon g-2 and future dedicated efforts to measure muon electric dipole moment (EDM) d_{µ}, we assess the indirect constraints imposed on d_{µ} by the EDM measurements performed with heavy atoms and molecules. We notice that the dominant muon EDM effect arises via the muon-loop induced "light-by-light" CP-odd amplitude ∝BE^{3}, and in the vicinity of a large nucleus the corresponding parameter of expansion can be significant, eE_{nucl}/m_{µ}^{2}∼0.04. We compute the d_{µ}-induced Schiff moment of the ^{199}Hg nucleus, and the linear combination of d_{e} and semileptonic C_{S} operator (dominant in this case) that determine the CP-odd effects in the ThO molecule. The results, d_{µ}(^{199}Hg)<6×10^{-20} e cm and d_{µ}(ThO)<2×10^{-20} e cm, constitute approximately threefold and ninefold improvements over the limits on d_{µ} extracted from the Brookhaven National Laboratory muon beam experiment.

Light Dark Matter at Neutrino Experiments.

Sub-GeV dark matter particles up-scattered by cosmic rays gain enough kinetic energy to pass the thresholds of large volume detectors on Earth. We then use public Super-Kamiokande and MiniBooNE data to derive a novel limit on the scattering cross section of dark matter with electrons that extends down to sub-keV masses, closing a previously allowed wide region of parameter space. We finally discuss search strategies and prospects at existing and planned neutrino facilities.