Brane SUSY breaking and the gravitino mass

Abstract By extending a previously proposed conformal gauge mediation model, we construct a gauge-mediated SUSY breaking (GMSB) model where a SUSY-breaking scale, a messenger mass, the μ-parameter and the gravitino mass in a minimal supersymmetric (SUSY) Standard Model (MSSM) are all explained by a single mass scale, a R-symmetry breaking scale. We focus on a low scale SUSY-breaking scenario with the gravitino mass m3/2 = $$ \mathcal{O}(1)\mathrm{eV} $$ O 1 eV , which is free from the cosmological gravitino problem and relaxes the fine-tuning of the cosmological constant. Both the messenger and SUSY-breaking sectors are subject to a hidden strong dynamics with the conformality above the messenger mass threshold (and hence the name of the model “strongly interacting conformal gauge mediation”). In our model, the Higgs B-term is suppressed and a large tan β is predicted, resulting in the relatively light second CP-even Higgs and the CP-odd Higgs with a sizable production cross section. These Higgs bosons can be tested at future LHC experiments.

Download Full-text

The upper bound of the second Higgs boson mass in minimal gauge mediation with the gravitino warm dark matter

Journal of High Energy Physics ◽

10.1007/jhep04(2021)024 ◽

2021 ◽

Vol 2021 (4) ◽

Author(s):

Gong jun Choi ◽

Tsutomu T. Yanagida ◽

Norimi Yokozaki

Keyword(s):

Dark Matter ◽

Higgs Boson ◽

Upper Bound ◽

Hadron Collider ◽

Susy Breaking ◽

Boson Mass ◽

Small Scale ◽

Gauge Mediation ◽

Gravitino Mass ◽

The Masses

Abstract A keV-scale gravitino arising from a minimal supersymmetric (SUSY) Standard Model (MSSM) is an interesting possibility since the small scale problems that the ΛCDM model encounters in the modern cosmology could be alleviated with the keV-scale gravitino serving as the warm dark matter (WDM). Such a light gravitino asks for a low scale supersymmetry (SUSY) breaking for which the gauge mediation (GM) is required as a consistent SUSY-breaking mediation mechanism. In this paper, we show upper bounds of the masses of the second CP-even Higgs boson H and the CP-odd Higgs boson A, assuming the keV-scale gravitino to be responsible for the current DM relic abundance: the upper bound on the mass of H/A is found to be ∼ 4 TeV for the gravitino mass of $$ \mathcal{O}\left(10-100\right) $$ O 10 − 100 keV. Interestingly, the mass of H/A can be as small as 2–3 TeV and the predicted tan β is as large as 55–60 for the gravitino mass of $$ \mathcal{O}(10) $$ O 10 keV. This will be tested in the near future Large Hadron Collider (LHC) experiments.

Download Full-text

Winding uplifts and the challenges of weak and strong SUSY breaking in AdS

Journal of High Energy Physics ◽

10.1007/jhep03(2021)284 ◽

2021 ◽

Vol 2021 (3) ◽

Author(s):

Arthur Hebecker ◽

Sascha Leonhardt

Keyword(s):

Complex Structure ◽

Susy Breaking ◽

Technical Level ◽

De Sitter ◽

Large Complex ◽

Breaking Scale ◽

Large Complex Structure

Abstract We discuss the problem of metastable SUSY breaking in the landscape. While this is clearly crucial for the various de Sitter proposals, it is also interesting to consider the SUSY breaking challenge in the AdS context. For example, it could be that a stronger form of the non-SUSY AdS conjecture holds: it would forbid even metastable non-SUSY AdS in cases where the SUSY-breaking scale is parametrically above/below the AdS scale. At the technical level, the present paper proposes to break SUSY using the multi-cosine-shaped axion potentials which arise if a long winding trajectory of a ‘complex-structure axion’ appears in the large-complex-structure limit of a Calabi-Yau orientifold. This has been studied in the context of ‘Winding Inflation’, but the potential for SUSY breaking has not been fully explored. We discuss the application to uplifting LVS vacua, point out the challenges which one faces in the KKLT context, and consider the possibility of violating the non-SUSY AdS conjecture in the type-IIA setting of DGKT.

Download Full-text

SUSY breaking constraints on modular flavor S3 invariant SU(5) GUT model

Journal of High Energy Physics ◽

10.1007/jhep02(2021)221 ◽

2021 ◽

Vol 2021 (2) ◽

Cited By ~ 3

Author(s):

Xiaokang Du ◽

Fei Wang

Keyword(s):

Susy Breaking ◽

Flavor Symmetry ◽

Modular Invariance ◽

Lepton Flavor ◽

Flavor Structure ◽

Flavor Mixing ◽

Breaking Mechanism ◽

Gut Scale ◽

Additional Constraints ◽

Rule Out

Abstract Modular flavor symmetry can be used to explain the quark and lepton flavor structures. The SUSY partners of quarks and leptons, which share the same superpotential with the quarks and leptons, will also be constrained by the modular flavor structure and show a different flavor(mixing) pattern at the GUT scale. So, in realistic modular flavor models with SUSY completion, constraints from the collider and DM constraints can also be used to constrain the possible values of the modulus parameter. In the first part of this work, we discuss the possibility that the S3 modular symmetry can be preserved by the fixed points of T2/ZN orbifold, especially from T2/Z2. To illustrate the additional constraints from collider etc on modular flavor symmetry models, we take the simplest UV SUSY-completion S3 modular invariance SU(5) GUT model as an example with generalized gravity mediation SUSY breaking mechanism. We find that such constraints can indeed be useful to rule out a large portion of the modulus parameters. Our numerical results show that the UV-completed model can account for both the SM (plus neutrino) flavor structure and the collider, DM constraints. Such discussions can also be applied straightforwardly to other modular flavor symmetry models, such as A4 or S4 models.

Download Full-text

Aether SUSY breaking: can aether be alternative to F-term SUSY breaking?

Journal of High Energy Physics ◽

10.1007/jhep08(2021)048 ◽

2021 ◽

Vol 2021 (8) ◽

Author(s):

Yusuke Yamada

Keyword(s):

Fluid Model ◽

Realistic Model ◽

Lorentz Symmetry ◽

Susy Breaking ◽

Accelerated Expansion ◽

Condensation Model ◽

Matter Sector

Abstract We investigate supersymmetry (SUSY) breaking scenarios where both SUSY and Lorentz symmetry are broken spontaneously. For concreteness, we propose models in which scalar fluid or vector condensation breaks Lorentz symmetry and accordingly SUSY. Then, we examine whether such scenarios are viable for realistic model buildings. We find, however, that the scalar fluid model suffers from several issues. Then, we extend it to a vector condensation model, which avoids the issues in the scalar fluid case. We show that accelerated expansion and soft SUSY breaking in matter sector can be achieved. In our simple setup, the soft SUSY breaking is constrained to be less than $$ \mathcal{O}(100)\mathrm{TeV} $$ O 100 TeV from the constraints on modification of gravity.

Download Full-text