Soft SUSY breaking and family symmetry

Ramage, M.R.; Ross, Graham G.

doi:10.1088/1126-6708/2005/08/031

Cited by 8 publications

(4 citation statements)

References 68 publications

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“…Although we have deduced M 3 < 0 from the approximate eqs(9,10), the the correlation persists in the near exact expression found in eq (23) of ref [17]. Adjusting to different squark splitting can occur in various schemes [28]. However the squark splitting can readily be adjusted without spoiling the fit because, up to nonlinear effects, the solution only requires the constraints implied by eq (13), so we may make γ b > γ d and hence make m 2 b < m 2 d by allowing for a small positive value for γ t .…”

Section: Low-energy Parametermentioning

confidence: 61%

Unification and fermion mass structure

2008

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Grand Unified Theories predict relationships between the GUT-scale quark and lepton masses. Using new data in the context of the MSSM, we update the values and uncertainties of the masses and mixing angles for the three generations at the GUT scale. We also update fits to hierarchical patterns in the GUT-scale Yukawa matrices. The new data shows not all the classic GUT-scale mass relationships remain in quantitative agreement at small to moderate tan β. However, at large tan β, these discrepancies can be eliminated by finite, tan β-enhanced, radiative, threshold corrections if the gluino mass has the opposite sign to the wino mass.

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Section: Low-energy Parametermentioning

confidence: 61%

Unification and fermion mass structure

2008

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“…On the other hand, the slight tension in µ → eγ is alleviated in the large tan β regime, quite along the lines of the full third family Yukawa unification. Moreover, a non-universal third family of squarks and sleptons is a generic prediction of this approach [50], and it might be the case that the third family sparticles could be heavier than the first two families. However CP violation in the third family of squarks and sleptons is expected to be small, with third family CP violating phases being only of order a few per cent, which implies that electroweak baryogenesis is probably not viable in this approach, and CP violation in the Higgs sector will not be observed in any SUSY model of this kind.…”

Section: Discussionmentioning

confidence: 99%

Solving the SUSY flavour and CP problems with SU(3) family symmetry

Antusch

King

Malinský

2008

J. High Energy Phys.

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We show how the SUSY flavour and CP problems can be solved using gauged SU (3) family symmetry previously introduced to describe quark and lepton masses and mixings, in particular neutrino tri-bimaximal mixing via constrained sequential dominance. The Yukawa and soft trilinear and scalar mass squared matrices and kinetic terms are expanded in powers of the flavons used to spontaneously break the SU (3) family symmetry, and the canonically normalized versions of these matrices are constructed. The soft mass matrices are then expressed in the Super-CKM basis, and the leading order mass insertion parameters are calculated, and are shown to satisfy the experimental constraints from flavour changing neutral current processes. Assuming that CP is spontaneously broken by the flavons, the next-to-leading order effects responsible for CP violation are then estimated, and the predictions for electric dipole moments are shown to be an order of magnitude more suppressed than those predicted from the constrained minimal supersymmetric standard model (CMSSM), and may be further suppressed if the high energy trilinear soft parameter is assumed to be relatively small. We also predict that, unlike in the CMSSM, ε ′ K /ε K may be dominated by the SUSY operator O 8 . We also discuss the additional constraints from unification, which can lead to further predictions for flavour changing in our scheme.

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“…If a flavor symmetry à la Froggatt-Nielsen [1] is responsible for the observed Yukawa couplings in a SUSY theory, this flavor symmetry should apply at the level of the superfields of the theory, which include both the SM fermions and their superpartners. After the flavor symmetry is broken spontaneously, we will obtain the Yukawa couplings as well as non-trivial corrections to the soft-breaking masses and trilinear couplings [3,[58][59][60][61][62][63].…”

Section: Introductionmentioning

confidence: 99%

Effective theories of flavor and the nonuniversal MSSM

Das¹,

López-Ibáñez²,

Pérez³

et al. 2017

Phys. Rev. D

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Flavor symmetriesà la Froggatt-Nielsen (FN) provide a compelling way to explain the hierarchies of fermionic masses and mixing angles in the Yukawa sector. In Supersymmetric (SUSY) extensions of the Standard Model where the mediation of SUSY breaking occurs at scales larger than the breaking of flavor, this symmetry must be respected not only by the Yukawas of the superpotential, but by the soft-breaking masses and trilinear terms as well. In this work we show that contrary to naive expectations, even starting with completely flavor blind soft-breaking in the full theory at high scales, the low-energy sfermion mass matrices and trilinear terms of the effective theory, obtained upon integrating out the heavy mediator fields, are strongly non-universal. We explore the phenomenology of these SUSY flavor models after the latest LHC searches for new physics.

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Soft SUSY breaking and family symmetry

Cited by 8 publications

References 68 publications

Unification and fermion mass structure

Unification and fermion mass structure

Solving the SUSY flavour and CP problems with SU(3) family symmetry

Effective theories of flavor and the nonuniversal MSSM

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