Leptogenesis and low-energy phases

Details Leptogenesis and low-energy phases Leptogenesis and low-energy phases

2002-06-28

arxiv.org/abs/hep-ph/0206304v3

Nucl.Phys.B648:345-375,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

amplified discussion, minor comments added (33 pages, 3 figures)

Scientific paper

10.1016/S0550-3213(02)00972-0

In supersymmetric models, the CP asymmetry produced in the decay of the lightest right-handed neutrino, $\equiv epsilon$, can be written as a function of weak scale parameters. We introduce a way of separating epsilon into contributions from the various weak-scale phases, and study the contribution of potentially measurable neutrino phases to leptogenesis. We find that the Majorana phase phi', which could have observable effects on neutrinoless double beta decay, is important for epsilon unless there are cancellations among phases. If the phase delta can be measured at a neutrino factory, then it contributes significantly to epsilon over much of parameter space.

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