Precision corrections to supersymmetric unification

Bagger, Jonathan; Matchev, K.; Pierce, Damien M.

doi:10.1016/0370-2693(95)00207-2

Cited by 132 publications

(168 citation statements)

References 31 publications

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“…Therefore, if one wants to make use of the experimental data on the couplings, it is necessary to include the corrections due to the new degrees of freedom 10 . This is also the main issue of some recent work [13]. In these papers, a calculation of complete susy contributions is carried out in order to determine the value of sin 2 θ W (m Z ) | M S from experimental quantities, but in the context of the MSSM.…”

Section: Comparison With Other Approaches and Conclusionmentioning

confidence: 99%

“…One way to avoid this result would be to considere a different unification group, which gives the reverse sign for this contribution [13]. We would have to look for a cancellation between "light" and "heavy" threshold effects.…”

Section: Comparison With Other Approaches and Conclusionmentioning

confidence: 99%

“…In Section 5 we offer our conclusions, and discuss other approaches that have emerged in the recent literature [11][12][13]. The works cited on Ref.…”

Section: Introductionmentioning

confidence: 95%

“…The works cited on Ref. [13] remark the importance of complete light (susy) threshold effects for the determination of the MS values of the gauge couplings at the electroweak scale, as they are extracted from experimental quantities, and the later implication of these initial values for unification. Susy thresholds distinguish between the quantities extracted using the SM, from the same quantities obtained on the MSSM.…”

Section: Introductionmentioning

confidence: 99%

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Effective couplings and perturbative unification

Bastero-Gil¹,

Pérez–Mercader²

1995

Nuclear Physics B

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In this paper we study the influence of the threshold effects due to massive degrees of freedom in the evolution with scale of gauge coupling constants. We first describe in detail the (standard) mass dependent renormalization prescription we use. This guides us to introduce and work with effective couplings, which are finite, process independent, and include complete threshold effects. We compute the evolution of the effective couplings in both, the Standard Model and its Minimal Supersymmetric extension, from m Z to the high energy region. We find that the effects from thresholds due to the standard massive gauge bosons are non-negligible, contrary to what is generally assumed when using other, less-accurate, descriptions of the thresholds, as for example in the step-function approximation. Moreover, we find that thresholds are relevant when studying perturbative SUSY unification, changing the conclusions reached when using the step-function approach. We find that threshold effects bring conflict between the known experimental data at m Z , the naturalness upper bound on the masses of SUSY partners and the perturbative unification of couplings.

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Section: Comparison With Other Approaches and Conclusionmentioning

confidence: 99%

Section: Comparison With Other Approaches and Conclusionmentioning

confidence: 99%

“…In Section 5 we offer our conclusions, and discuss other approaches that have emerged in the recent literature [11][12][13]. The works cited on Ref.…”

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effective couplings and perturbative unification

Bastero-Gil¹,

Pérez–Mercader²

1995

Nuclear Physics B

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“…The motivation for this is that one can always match a weak scale theory including full threshold corrections to the initial conditions we gave in the examples above. In practice, this matching can become rather complicated [34,35,36] if one demands a high level of precision. However, it is important to understand the origin of the uncertainties associated with weak scale thresholds, as well as recognizing that, for example, measured (pole) masses must be translated into renormalized masses, and the corrections can be large (especially for the gluino [20,34,36]).…”

Section: Weak Scale Thresholdsmentioning

confidence: 99%

Disrupting the one-loop renormalization group invariant M/α in supersymmetry

Kribs¹

1998

Nuclear Physics B

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It is well known that in low energy supersymmetry the ratio of the gaugino mass to the gauge coupling squared, M/α, is renormalization group invariant to one-loop. We present a systematic analysis of the corrections to this ratio, including standard two-loop corrections from gauge and Yukawa couplings, corrections due to an additional U (1) ′ gaugino, threshold corrections, superoblique corrections, corrections due to extra matter, GUT and Planck scale corrections, and "corrections" from messenger sectors with supersymmetry breaking communicated via gauge-mediation. We show that many of these effects induce corrections at the level of a few to tens of percent, but some could give much larger corrections, drastically disrupting the renormalization group extrapolation of the ratio to higher scales. Our analysis is essentially model-independent, and therefore can be used to determine the ambiguities in extrapolating the ratio in any given model between the weak scale and higher scales.

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Implications of a Dilaton in Gauge Theory and Cosmology

Dick¹

1997

Fortschr. Phys.

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After a review of theoretical motivations to consider theories with direct couplings of scalar fields to Ricci and gauge curvature terms, we consider the dynamics and non‐perturbative stabilization of a dilaton in three and in four dimensions. In particular, we derive generalized Coulomb potentials in the presence of a dilaton and discuss a low energy effective dilaton potential induced by instanton effects and the S‐dual coupling to axions. We conclude with a discussion of cosmological implications of a light dilaton.

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Precision corrections to supersymmetric unification

Cited by 132 publications

References 31 publications

Effective couplings and perturbative unification

Effective couplings and perturbative unification

Disrupting the one-loop renormalization group invariant M/α in supersymmetry

Implications of a Dilaton in Gauge Theory and Cosmology

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