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New sources of CP violation, beyond the known sources in the standard model(SM), are required to explain the baryon asymmetry of the universe. Measurementof a non-zero permanent electric dipole moment (EDM) for fundamental particles,such as in an electron or a neutron, or in nuclei or atoms, can help us gain ahandle on the sources of CP violation, both in SM and beyond. Multiplemechanisms within the SM can generate CP violating EDMs, viz.\ through the CKMmatrix in the weak sector or through the QCD $\bar{\theta}$ parameter in thestrong sector. We will estimate the maximum possible EDMs of leptons, certainbaryons, select atoms and molecules in the (CKM$\bigoplus\bar{\theta}$)framework, assuming that the EDM wholly originates from either of the two SMmechanisms, independently. These estimates have been presented in light of thecurrent experimental upper limits on the EDMs, in the following systems -leptons: $e^-$, $\mu^-$, $\tau^-$, $\nu_e^0$, $\nu^0_{\mu}$, $\nu^0_{\tau}$,baryons: $n^0$, $p^+$, $\Lambda^0$, $\Sigma^0$, $\Xi^0$, $\Lambda^+_c$,$\Xi^+_c$, atoms: $^{85}$Rb, $^{133}$Cs, $^{210}$Fr, $^{205}$Tl, $^{199}$Hg,$^{129}$Xe, $^{225}$Ra, $^{223}$Rn, and molecules: HfF$^+$, PbO, YbF, ThO, RaF,TlF. Particularly, to drive home the point that EDMs in different systemsconstrain CP-violating interactions differently, we show that the same measuredconstraint on the EDM in two different systems may not actually be equallyconstraining on CP violating parameters, and to emphasize the need to measure anon-zero EDM in multiple systems before understanding the origins of theseCP-violating EDMs.

Estimation of CP violating EDMs from known mechanisms in the SM