Abstract
It has been claimed that Dirac gaugino masses are necessary for realistic models of low-scale supersymmetry breaking, and yet very little attention has been paid to the phenomenology of a light gravitino when gauginos have Dirac masses. We begin to address this deficit by investigating the couplings and phenomenology of the gravitino in the effective Lagrangian approach. We pay particular attention to the phenomenology of the scalar octets, where new decay channels open up. This leads us to propose a new simplified effective scenario including only light gluinos, sgluons and gravitinos, allowing the squarks to be heavy – with the possible exception of the third generation. Finally, we comment on the application of our results to Fake Split Supersymmetry.
Highlights
The non-observation of supersymmetric particles so far, has cast doubts on our expectations for a solution of the hierarchy problem within the standard realisations of supersymmetry (SUSY)
Since the mass of the gravitino is related to the SUSY breaking scale, phenomenological studies of low-scale SUSY breaking at colliders are based on searches for signals related to ultralight gravitinos
Motivated by the improvement that both low-scale SUSY breaking and Dirac gauginos bring to the naturalness problem as well as the indication that Dirac gaugino masses are necessary for low-scale SUSY scenarios, we studied the structure and the phenomenological implications of interactions between an ultralight gravitino and MSSM with Dirac gauginos
Summary
The non-observation of supersymmetric particles so far, has cast doubts on our expectations for a solution of the hierarchy problem within the standard realisations of supersymmetry (SUSY). Model building aspects of low-scale SUSY breaking suggest that the gauginos should be of Dirac type [12,13]. This last consequence has many far reaching implications for the phenomenology of lowscale breaking models which have received very little attention so far in the literature, with the exception of [13,14] (in the context of brane-worlds). Outside the restriction of low-scale SUSY breaking, in Section 4 we describe how the decays of gluinos to gravitinos are modified in the limit of heavy squarks and when gauginos have both Majorana and Dirac masses, as in the context of Fake Split SUSY [61,62]
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