Is the stop mass below the top mass?

Ehret, R.; Kazakov, D. I.

doi:10.1016/0370-2693(94)90615-7

Cited by 14 publications

(18 citation statements)

References 73 publications

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“…[23] and the value of sin 2 θ M S has been presented at Marseille [24]. The α 3 value corresponds to value measured at LEP form the ratio of the hadronic-and leptonic cross sections [25], which agrees well with the world average [26]. This value has the smallest theoretical uncertainty from the higher order corrections, we prefer to take this value alone.…”

Section: Unification Of the Couplingssupporting

confidence: 61%

Predictions of SUSY masses in the minimal supersymmetric grand unified theory

Boer

Ehret

Kazakov

1995

Z. Phys. C - Particles and Fields

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The Minimal Supersymmetric Standard Model (MSSM) distinguishes itself from other GUT's by a successful prediction of many unrelated phenomena with a minimum number of parameters. Among them: a) Unication of the couplings constants; b) Unication of the masses; c) Proton decay; d) Electroweak symmetry breaking at a scale far below the unication scale and the corresponding relation between the gauge boson masses and the top quark mass. A combined t of the free parameters in the MSSM to these low energy constraints shows that the MSSM model can satisfy these constraints simultaneously. From the tted parameters the masses of the as yet unobserved superpartners of the SM particles are predicted. The second order QCD coupling constant is required to be between 0.108 and 0.132. The complete second order renormalization group equations for the gauge and Yukawa couplings are used and analytical solutions for the neutral gauge boson, the Higgs masses and the sparticle masses are derived, taking into account the one-loop corrections to the Higgs potential.

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Section: Unification Of the Couplingssupporting

confidence: 61%

Predictions of SUSY masses in the minimal supersymmetric grand unified theory

Boer

Ehret

Kazakov

1995

Z. Phys. C - Particles and Fields

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“…These would represent many additional free parameters, if all considered independent. Therefore we will examine the supergravity inspired MSSM, in which all particle masses depend on 5 parameters at the GUT scale: the common breaking mass m 0 for all spin 0 sparticles (squarks and sleptons), the common breaking mass m 1/2 for the spin 1/2 gauginos, the Higgs mixing parameter µ, the bilinear Higgs coupling B and the trilinear couplings For given values of m 0 and m 1/2 the parameters related to the Higgs sector (µ, tan β, A 0 ) are strongly constrained by EWSB and bottom-tau unification [6,7,8]. The latter constraint yields two preferred solutions for m t = 179±12 GeV [14]: the low tan β scenario (tan β ≈ 1.7) which corresponds to a top Yukawa coupling much larger than the bottom Yukawa coupling…”

Section: Corrections To the Higgs Massesmentioning

confidence: 99%

“…A more precise prediction can be obtained, if one considers simultaneously the constraints for which the constrained MSSM (CMSSM) has become so attractive, namely the unification of the three gauge couplings, radiative electroweak symmetry breaking (EWSB) at the M Z scale and unification of the Yukawa couplings [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

MSSM predictions of the neutral Higgs boson masses and LEP II production cross sections

et al. 1997

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Within the framework of the Minimal Supersymmetric Standard Model (MSSM) the Higgs masses and LEP II production cross sections are calculated for a wide range of the parameter space. In addition, the parameter space restricted by unification, electroweak symmetry breaking and other low energy constraints is considered in detail, in which case the masses of all SUSY partners can be estimated, so that their contributions to the radiative corrections can be calculated. Explicit analytical formulae for these contributions are derived. The radiative corrections from the Yukawa couplings of the third generation are found to dominate over the contributions from charginos and neutralinos. Large Higgs mass uncertainties are due to the top mass uncertainty and the unknown sign of the Higgs mixing parameter. For the low tan β scenario the mass of the lightest Higgs is found to be below 90 GeV for a top mass below 180 GeV. The cross section at a LEP II energy of 192 GeV is sufficient to find or exclude this scenario. For the high tan β scenario only a small fraction of the parameter space can be covered, since the Higgs mass is predicted between 105 and 125 GeV in most cases. At the theoretically possible LEP II energy of 205 GeV part of the parameter space for the large tan β scenario would be accessible.

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“…At present we know a lot about SUSY-GUT's with universal terms [4]- [13]. If we include the assumption of Yukawa coupling unification and radiative electroweak symmetry breaking, we are in many cases led to a very restrictive model with some definite predictions.…”

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confidence: 99%

Implications of non-universality of soft terms in supersyrnmetric grand unified theories

1995

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Most discussions of supersymmetric grand unified theories assume universality of the soft supersymmetry breaking terms at the grand scale. We point out that the behaviour of these theories might change significantly in the presence of nonuniversal soft terms. Particularly in SO(10)-like models with a large value of tanβ we observe a decisive change of predictions, allowing the presence of relatively light gauginos as well as small supersymmetric corrections to the b-quark mass. Some results remain rather stable, including the µ-M 1/2 correlation. Models with small tanβ seem to be less affected by non-universality which mainly leads to the new possibility of small m 0 (i.e. the squark and slepton soft mass parameter), excluded in the universal case.

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Is the stop mass below the top mass?

Cited by 14 publications

References 73 publications

Predictions of SUSY masses in the minimal supersymmetric grand unified theory

Predictions of SUSY masses in the minimal supersymmetric grand unified theory

MSSM predictions of the neutral Higgs boson masses and LEP II production cross sections

Implications of non-universality of soft terms in supersyrnmetric grand unified theories

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