Flavoured soft leptogenesis and natural values of the B term

Details Flavoured soft leptogenesis and natural values of the B term Flavoured soft leptogenesis and natural values of the B term

2010-04-28

arxiv.org/abs/1004.5125v2

JHEP 1007:001,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 5 figures postscript, Minor changes to match the published version in JHEP

Scientific paper

10.1007/JHEP07(2010)001

We revisit flavour effects in soft leptogenesis relaxing the assumption of universality for the soft supersymmetry breaking terms. We find that with respect to the case in which the heavy sneutrinos decay with equal rates and equal CP asymmetries for all lepton flavours, hierarchical flavour configurations can enhance the efficiency by more than two orders of magnitude. This translates in more than three order of magnitude with respect to the one-flavour approximation. We verify that lepton flavour equilibration effects related to off-diagonal soft slepton masses are ineffective for damping these large enhancements. We show that soft leptogenesis can be successful for unusual values of the relevant parameters, allowing for $B\sim {\cal O}({\rm TeV})$ and for values of the washout parameter up to $m_{\rm eff}/m_* \sim 5\times 10^{3}$.

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