Domain walls and CP violation with left right supersymmetry: implications for leptogenesis and electron EDM

Low scale leptogenesis scenarios are difficult to verify due to our inability to relate the parameters involved in the early universe processes with the low energy or collider observables. Here we show that one can in principle relate the parameters giving rise to the transient CP violating phase involved in leptogenesis with those that can be deduced from the observation of electric dipole moment (EDM) of the electron. We work out the details of this in the context of the left right symmetric supersymmetric model (LRSUSY) which provides a strong connection between such parameters. In particular, we show that baryon asymmetry requirements imply the scale MB-L of U(1)(B-L) symmetry breaking to be larger than 10(4.5) GeV. Moreover the scale M-R of SU(2)(R) symmetry breaking is tightly constrained to lie in a narrow band significantly below MB-L2/MEW. These are the most stringent constraints on the parameter space of LRSUSY model being considered.

Automated summary

The study shows a connection between the parameters of transient CP violating phase in leptogenesis and the observation of electron electric dipole moment, with the left right symmetric supersymmetric model providing an effective method to connect these parameters. The research results indicate strict constraints on the scale of U(1)(B-L) symmetry breaking and the scale of SU(2)(R) symmetry breaking.