Brane mediated supersymmetry breaking

King, Stephen F.; Rayner, D. A. J.

doi:10.1016/s0550-3213(01)00220-6

Cited by 15 publications

(31 citation statements)

References 38 publications

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“…In this paper we extend our previous analysis of the non-universal MSSM to a semi-realistic type I string theory model of the form originally proposed in [4] and phenomenologically analysed in [5] (see also [6], [7], [8], [9]). Using such a string model we can address two questions.…”

Section: Introductionmentioning

confidence: 62%

Natural dark matter from type I string theory

King¹,

Roberts²

2007

J. High Energy Phys.

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We study neutralino dark matter within a semi-realistic type I string model, where supersymmetry breaking arises from F-terms of moduli fields parameterised in terms of Goldstino angles, which automatically gives rise to nonuniversal soft third sfamily and gaugino masses. We study the fine-tuning sensitivities for dark matter and electroweak symmetry breaking across the parameter space of the type I string model, and compare the results to a similar analysis in the non-universal MSSM. Within the type I string model we find that neutralino dark matter can be naturally implemented in theτ bulk region, the Z 0 resonance region and the maximally tempered Bino/Wino/Higgsino region, in agreement with the results of the non-universal MSSM analysis. We also find that in the type I string model the "well-tempered" Bino/Wino region is less fine-tuned than in the MSSM, whereas theτ co-annihilation region exhibits a significantly higher degree of fine-tuning than in the MSSM.

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Section: Introductionmentioning

confidence: 62%

Natural dark matter from type I string theory

King¹,

Roberts²

2007

J. High Energy Phys.

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“…[24] demonstrated that the SS effects are always present, and a vanishing SS parameter at tree-level will be generated at 1-loop by bulk supergravity fields 15 . In the case that SUSY breaking is localized on a hidden sector brane, the SS breaking parameter ω SS is no longer discrete, but may take a range of values that depend upon the relative strength of the SUSY breaking and the matter content of fields living in the extra dimension 16 . In our model, the third family and Higgs hypermultiplets (N H = 19) live in the bulk with the MSSM vector multiplets (N V = 12), and the SS breaking parameter tends towards ω SS = 0 (ω SS = 1/2) for weak (strong) SUSY breaking on the brane which is equivalent to minimal (maximal) mixing in the stop sector.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Supersymmetric Higgs bosons in a 5D orbifold model

2002

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We analyze the phenomenology of the Higgs sector in a 5D model compactified on an S 1 /Z 2 orbifold where the compactification scale M C is around the TeV scale. We show that the conventional MSSM Higgs boson mass bounds in 4D can be violated when we allow the gauge sector, Higgs and third family multiplets to live in the fifth extra dimension. Supersymmetry is broken at an orbifold fixed point which is spatially separated from the Yukawa brane where two chiral families are localized. When the brane-localized supersymmetry breaking term for the stop sector is arbitrarily large, we find that the stop KK-mode mass spectrum is completely independent of the Higgs fields. Hence, the Higgs masses only receive radiative contributions from the top KK-modes. The 1-loop effective potential is insensitive to the cutoff scale of the theory and yields a negative Higgs squared-mass contribution that triggers electroweak symmetry breaking in the range 1.5 < ∼ tan β < ∼ 20, where bottom/sbottom loop effects can be ignored. The recent LEP Higgs bound at m h 0 > 114.1 GeV, in conjunction with naturalness arguments, allows us to bracket the compactification scale 1.5 < ∼ M C < ∼ 4 TeV. Within this parameter space, we find that the lightest Higgs boson mass has an upper bound m h 0 < ∼ 160 GeV with the magnitude of the µ-parameter restricted to the range 33 < ∼ |µ| < ∼ 347 GeV.

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“…1 obtained from the charged lepton masses in Eq. (42), and v and m SUSY represent the Higgs VEV, v ≃ 174 GeV, and the mass scale of supersymmetry breaking parameters, respectively. Note that these mass insertion parameters do not depend on tan β, in contrast to many supersymmetric models where the µ → e transition amplitude is proportional to tan β.…”

Section: Impact On Flavor Physicsmentioning

confidence: 99%

Supersymmetry with Small mu: Connections between Naturalness, Dark Matter, and (Possibly) Flavor

Kitano¹,

Nomura²

2006

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Weak scale supersymmetric theories often suffer from several naturalness problems: the problems of reproducing the correct scale for electroweak symmetry breaking, the correct abundance for dark matter, and small rates for flavor violating processes. We argue that the first two problems point to particular regions of parameter space in models with weak scale supersymmetry: those with a small µ term. This has an interesting implication on direct dark matter detection experiments. We find that, if the signs of the three gaugino mass parameters are all equal, we can obtain a solid lower bound on the spin-independent neutralino-nucleon cross section, σ SI . In the case that the gaugino masses satisfy the unified mass relations, we obtain σ SI > ∼ 4 × 10 −46 cm 2 (1 × 10 −46 cm 2 ) for fine-tuning in electroweak symmetry breaking no worse than 10% (5%). We also discuss a possibility that the three problems listed above are all connected to the hierarchy of fermion masses. This occurs if supersymmetry breaking and electroweak symmetry breaking (the Higgs fields) are coupled to matter fields with similar hierarchical structures. The discovery of µ → e transition processes in near future experiments is predicted in such a framework.

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Brane mediated supersymmetry breaking

Cited by 15 publications

References 38 publications

Natural dark matter from type I string theory

Natural dark matter from type I string theory

Supersymmetric Higgs bosons in a 5D orbifold model

Supersymmetry with Small mu: Connections between Naturalness, Dark Matter, and (Possibly) Flavor

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