Approximate R-symmetries and the μ term

Brümmer, Felix; Kappl, Reinhard; Ratz, Michael; Schmidt-Hoberg, Kai

doi:10.1007/jhep04(2010)006

Cited by 36 publications

(27 citation statements)

References 39 publications

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“…For some suggested solutions in SUSY GUTs and string theory for the µ problem, see refs. [69,162,[164][165][166][167][170][171][172]. Finally, in string theory (and orbifold GUTs), orbifold projection eliminate certain states.…”

Section: Running Couplingmentioning

confidence: 99%

Neutron Majorana mass from exotic instantons

Addazi

Bianchi

2014

J. High Energ. Phys.

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We show how a Majorana mass for the neutron could result from nonperturbative quantum gravity effects peculiar to string theory. In particular, "exotic instantons" in un-oriented string compactifications with D-branes extending the (supersymmetric) standard model could indirectly produce an effective operator δm n t n + h.c.. In a specific model with an extra vector-like pair of 'quarks', acquiring a large mass proportional to the string mass scale (exponentially suppressed by a function of the string moduli fields), δm can turn out to be as low as 10 −24 -10 −25 eV.The induced neutron-antineutron oscillations could take place with a time scale τ nn > 10 8 s that could be tested by the next generation of experiments. On the other hand, proton decay and FCNC's are automatically strongly suppressed and are compatible with the current experimental limits.Depending on the number of brane intersections, the model may also lead to the generation of Majorana masses for R-handed neutrini. Our proposal could also suggest neutron-neutralino or neutron-axino oscillations, with implications in UCN, Dark Matter Direct Detection, UHECR and Neutron-Antineutron oscillations.This suggests to improve the limits on neutron-antineutron oscillations, as a possible test of string theory and quantum gravity.

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Section: Running Couplingmentioning

confidence: 99%

Neutron Majorana mass from exotic instantons

Addazi

Bianchi

2014

J. High Energ. Phys.

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“…This is related to a discrete R-symmetry [9] that can protect the µ-parameter in the following way: In some cases the discrete R-symmetry is enlarged to an approximate U(1) R [17,18]. 1 Therefore, a µ-parameter is generated at a higher order M in the superpotential W , where the approximate U(1) R is broken to its exact discrete subgroup.…”

Section: Lesson 1: Higgs-doublets From the Bulkmentioning

confidence: 99%

Geography of Fields in Extra Dimensions: String Theory Lessons for Particle Physics

Nilles

Vaudrevange

2015

Advanced Series on Directions in High Energy Physics

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String theoretical ideas might be relevant for particle physics model building. Ideally one would hope to find a unified theory of all fundamental interactions. There are only few consistent string theories in D = 10 or 11 space-time dimensions, but a huge landscape in D = 4. We have to explore this landscape to identify models that describe the known phenomena of particle physics. Properties of compactified six spatial dimensions are crucial in that respect. We postulate some useful rules to investigate this landscape and construct realistic models. We identify common properties of the successful models and formulate lessons for further model building.

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“…In fact we could identify an underlying discrete R-symmetry [10] that protected the μ-parameter. In some cases this R-symmetry [42][43][44] was only approximate and could therefore allow a μ-parameter at a higher order in the superpotential sufficiently suppressed by a high power of the Fayet-Iliopoulos parameter ( ).…”

Section: Lesson 1: the Higgs Doubletsmentioning

confidence: 99%

The strings connection: MSSM-like models from strings

Nilles¹

2014

Supersymmetry After the Higgs Discovery

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String theory constructions towards the MSSM allow us to identify some general properties that could be relevant for tests at the LHC. They originate from the geometric structure of compactification and the location of fields in extra-dimensional space. Within the framework of the heterotic MiniLandscape we extract some generic lessons for supersymmetric model building. Among them is a specific pattern of SUSY breakdown based on mirage mediation and remnants of extended supersymmetry. This leads to a split spectrum with heavy scalars of the first two families of quarks and leptons and suppressed masses for gauginos, top partners and Higgs bosons. The models exhibit some specific form of hidden supersymmetry consistent with the high mass of the Higgs boson and all presently available experimental constraints. The most compelling picture is based on precision gauge coupling unification that might be in the kinematic reach of the LHC.

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Approximate R-symmetries and the μ term

Cited by 36 publications

References 39 publications

Neutron Majorana mass from exotic instantons

Neutron Majorana mass from exotic instantons

Geography of Fields in Extra Dimensions: String Theory Lessons for Particle Physics

The strings connection: MSSM-like models from strings

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