Aspects of Split Supersymmetry

By N. Arkani-Hamed, S. Dimopoulos, G. Giudice, A. Romanino. 2004

634 citations recorded by the source corpus.

We explore some fundamental differences in the phenomenology, cosmology and model building of Split Supersymmetry compared with traditional low-scale supersymmetry. We show how the mass spectrum of Split Supersymmetry naturally emerges from theories where the dominant source of supersymmetry breaking preserves an R symmetry, characterize the class of theories where the unavoidable R-breaking by gravity can be neglected, and point out a new possibility, where supersymmetry breaking is directly communicated at tree level to the visible sector via renormalizable interactions. Next, we discuss possible low-energy signals for Split Supersymmetry. The absence of new light scalars removes all the phenomenological difficulties of low-energy supersymmetry, associated with one-loop flavor and CP violating effects. However, the electric dipole moments of leptons and quarks do arise at two loops, and are automatically at the level of present limits with no need for small phases, making them accessible to several ongoing new-generation experiments. We also study proton decay in the context of Split Supersymmetry, and point out scenarios where the dimension-six induced decays may be observable. Finally, we show that the novel spectrum of Split Supersymmetry opens up new possibilities for the generation of dark matter, as the decays of ultraheavy gravitinos in the early universe typically increase the abundance of the lightest neutralino above its usual freeze-out value. This allows for lighter gauginos and Higgsinos, more accessible both to the LHC and to dark-matter detection experiments.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3dfe1ebec8864942d229baa1b0a392742cf2dc11

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Citations in the corpus

Higgs mass and unnatural supersymmetry (2014, background): “It retains the positive aspects of Split SUSY (gauge coupling unification, dark matter candidates, easing of the flavor problem) without requiring the artificial (although possible [46, 48, 71]) suppression of one-loop anomaly-mediated gravitational contributions.”
Inflation and string cosmology (2001, background): “First of all, one may try to construct realistic particle physics models with superheavy gravitinos [104, 105].”
Towards inflation in string theory (2003, background): “First of all, one may try to construct realistic particle physics models with superheavy gravitinos [75, 76].”
Landscape, the scale of SUSY breaking, and inflation (2004, background): “[14, 15], or modify the scenario in such a way as to make it possible to reduce the gravitino mass by many orders of magnitude.”
Accidental composite dark matter (2015, methodology): “J H E P 0 7 ( 2 0 1 5 ) 0 3 9 figure 4, giving, in leading log approximation [51],”
Dark Matter through the Higgs portal (2019, background): “the sfermion will decouple from the low energy spectrum and are integrated out [468–472].”
Predictive Landscapes and New Physics at a TeV (2005, methodology): “As in the case of split SUSY [35], at two-loops, this theory will induce an electric dipole moment for the SM fermions, which is at the edge of current experiments for large θ.”
de Sitter vacua from uplifting D-terms in effective supergravities from realistic strings (2006, methodology): “It is amusing that this scenario (which, of course, would get radiative corrections) corresponds to the assumptions of the so-called split-SUSY models [38, 39], whose possible existence and viability has been invoked precisely in the context of landscape frameworks, as those suggested by the KKLT se”