Dark matter scenarios in a constrained model with Dirac gauginos

Abstract

Abstract:We perform the first analysis of Dark Matter scenarios in a constrained model with Dirac Gauginos. The model under investigation is the Constrained Minimal Dirac Gaugino Supersymmetric Standard model (CMDGSSM) where the Majorana mass terms of gauginos vanish. However, R-symmetry is broken in the Higgs sector by an explicit and/or effective B µ -term. This causes a mass splitting between Dirac states in the fermion sector and the neutralinos, which provide the dark matter candidate, become pseudo-Dirac states. We discuss two scenarios: the universal case with all scalar masses unified at the GUT scale, and the case with non-universal Higgs soft-terms. We identify different regions in the parameter space which fulfill all constraints from the dark matter abundance, the limits from SUSY and direct dark matter searches and the Higgs mass. Most of these points can be tested with the next generation of direct dark matter detection experiments.

Higgs alignment from extended supersymmetry

“…Finally, we note that this model does not have gauge-coupling unification. If we wish to naturally restore gauge coupling unification, we can add additional vector-like lepton fields, as was done in [ 55 , 64 ]. Since they are vector-like, we could also allow them to be hypermultiplets of the at , but their inclusion will little change the discussion in this paper so for sake of generality we shall neglect them.…”

Leading two-loop corrections to the Higgs boson masses in SUSY models with Dirac gauginos

“…[25] and at two loops in refs. [15,16]; and also for the MRSSM at one loop in ref. [67] and two loops in refs.…”

“…The minimal choice, which we will denote as the Minimal Dirac Gaugino Supersymmetric Standard Model (MDGSSM), consists in simply adding the adjoint chiral multiplets to the field content of the MSSM, and allowing for all gauge-invariant terms in the superpotential and in the soft SUSY-breaking Lagrangian. The reader should note that in recent works [15][16][17] the term MDGSSM has also been used to describe a unified scenario where extra lepton-like states are added to ensure natural gauge-coupling unification, but the distinction will be irrelevant for this paper.If we wish to avoid large Majorana masses for the gauginos -and benefit from simpler SUSYbreaking scenarios [18] -we should avoid R-symmetry breaking in the soft terms, which also means removing the MSSM-like A-terms; this then naturally embeds into gauge-mediated scenarios [6,[19][20][21][22][23][24]. We may retain a B µ term since it is required for EWSB and will not generate Majorana masses through renormalisation group evolution.…”

“…The minimal choice, which we will denote as the Minimal Dirac Gaugino Supersymmetric Standard Model (MDGSSM), consists in simply adding the adjoint chiral multiplets to the field content of the MSSM, and allowing for all gauge-invariant terms in the superpotential and in the soft SUSY-breaking Lagrangian. The reader should note that in recent works [15][16][17] the term MDGSSM has also been used to describe a unified scenario where extra lepton-like states are added to ensure natural gauge-coupling unification, but the distinction will be irrelevant for this paper.…”

Constraining the R -symmetric chargino NLSP at the LHC

“…The situation is further complicated by the fact that the measured Higgs mass is difficult to achieve in the MSSM without large radiative * calvara1@nd.edu † adelgad2@nd.edu ‡ amarti41@nd.edu corrections from heavy particles. Motivated by these issues, several studies have abandoned minimality in favor of a better agreement with null experimental results on colored supersymmetric particles and/or less fine-tuning (FT) [9][10][11][12][13][14][15][16][17][18][19][20]. Of particular interest is the possibility of Dirac gauginos [21].…”