Abstract
In the context of supersymmetric models where the gauginos may have both Majorana and Dirac masses we investigate the general constraints from flavour-changing processes on the scalar mass matrices. One finds that the chirality-flip suppression of flavour-changing effects usually invoked in the pure Dirac case holds in the mass insertion approximation but not in the general case, and fails in particular for inverted hierarchy models. We quantify the constraints in several flavour models which correlate fermion and scalar superpartner masses. We also discuss the limit of very large Majorana gaugino masses compared to the chiral adjoint and Dirac masses, where the remaining light eigenstate is the “fake” gaugino, including the consequences of suppressed couplings to quarks beyond flavour constraints.
Highlights
Supersymmetric extensions of the Standard Model are arguably still the most plausible ways to deal with the various mysteries of the Standard Model
Dudas et al / Nuclear Physics B 884 (2014) 632–671 at LHC for the time being suggests, that we should seriouslyconsider non-minimal extensions compared to the minimal supersymmetric extension (MSSM) in all its various forms
In models in which the scale of mediation of supersymmetry breaking is similar or higher than the scale of flavour symmetry breaking, fermion masses and mixing hierarchies are correlated with the flavour structure of superpartners
Summary
The simplest models based on a single abelian flavoured gauge group, providing an approximate alignment mechanism for scalar mass matrices, still require scalar partners heavier than at least 100 TeV Both collider and flavour constraints encourage us to search for non-minimal extensions with suppressed collider bounds and flavour-changing transitions. This happens when the Majorana gaugino mass is much bigger than the Dirac and the adjoint fermion masses.
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