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Abstract
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 orders 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 and for values of the washout parameter up to meff/m* ∼ 5 × 103.
Details
1 State University of New York at Stony Brook, C.N. Yang Institute for Theoretical Physics, Stony Brook, U.S.A. (GRID:grid.36425.36) (ISNI:0000000122169681)
2 State University of New York at Stony Brook, C.N. Yang Institute for Theoretical Physics, Stony Brook, U.S.A. (GRID:grid.36425.36) (ISNI:0000000122169681); Dep. d’Estructura i Constituents de la Matèria and ICC-UB Universitat de Barcelona, Institució Catalana de Recerca i Estudis Avançats (ICREA), Diagonal 647Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000000419370247)
3 Dep. d’Estructura i Constituents de la Matèria and ICC-UB Universitat de Barcelona, Institució Catalana de Recerca i Estudis Avançats (ICREA), Diagonal 647Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000000419370247)