Proton decay and cosmology strongly constrain the minimal SU(5) supergravity model

López, Jorge L.; Nanopoulos, Dimitri V.; Pois, H.

doi:10.1103/physrevd.47.2468

Cited by 46 publications

(53 citation statements)

References 40 publications

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“…This observation, together with the fact that |µ| is large, yields simple correlations between the lightest chargino and neutralinos and the gluino [7,50], namely…”

Section: Susy Mass Spectrum Correlationsmentioning

confidence: 99%

Supersymmetric particle spectrum

1994

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We examine the spectrum of supersymmetric particles predicted by grand unified theoretical (GUT) models where the electroweak symmetry breaking is accomplished radiatively. We evolve the soft supersymmetry breaking parameters according to the renormalization group equations (RGE). The minimization of the Higgs potential is conveniently described by means of tadpole diagrams. We present complete one-loop expressions for these minimization conditions, including contributions from the matter and the gauge sectors. We concentrate on the low tan β fixed point region (that provides a natural explanation of a large top quark mass) for which we find solutions to the RGE satisfying both experimental bounds and fine-tuning criteria. We also find that the constraint from the consideration of the lightest supersymmetric particle as the dark matter of the universe is accommodated in much of parameter space where the lightest neutralino is predominantly gaugino. The supersymmetric mass spectrum displays correlations that are model-independent over much of the GUT parameter space.

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“…This observation, together with the fact that |µ| is large, yields simple correlations between the lightest chargino and neutralinos and the gluino [7,50], namely…”

Section: Susy Mass Spectrum Correlationsmentioning

confidence: 99%

Supersymmetric particle spectrum

1994

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“…Since M H 3 > M V is required to suppress dimension-five proton decay operators in minimal SU(5) [22,23], δ SU (5) heavy > 0 in general [11], unless one resorts to unnaturally large sparticle masses.…”

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confidence: 99%

Lowering αs by flipping SU(5)

1996

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We show that the prediction for α s (M Z ) in flipped SU(5) is naturally lower than in minimal SU(5), and that the former can accommodate the full range of α s (M Z ) presently allowed by experiment. Our computations include two-loop (δ 2loop ) and light (δ light ) and heavy (δ heavy ) threshold effects. Unlike minimal SU(5), in flipped SU(5) the heavy threshold effects can naturally decrease the predicted value of α s (M Z ). We also show that the value of the proton lifetime into the dominant channel p → e + π 0 is within the observable range at SuperKamiokande, and should discriminate against minimal supersymmetric SU(5), where the dominant mode is p →νK + .

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“…Experimental predictions in this class of models for processes at present and near future collider facilities can be obtained and have been determined for the various supergravity models we consider below (LEPI [8,7], Tevatron [9], HERA [10], LEPII [11]). Unfortunately, the range of sparticle and Higgs masses is quite broad, even for the constrained models we consider.…”

Section: Introductionmentioning

confidence: 99%

Strongest experimental constraints on SU(5)×U(1) supergravity models

et al. 1994

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We consider a class of well motivated string-inspired flipped SU(5) supergravity models which include four supersymmetry breaking scenarios: no-scale, strict noscale, dilaton, and special dilaton, such that only three parameters are needed to describe all new phenomena (m t , tan β, mg). We show that the LEP precise measurements of the electroweak parameters in the form of the ǫ 1 variable, and the CLEOII allowed range for B(b → sγ) are at present the most important experimental constraints on this class of models. For m t > ∼ 155 (165) GeV, the ǫ 1 constraint (at 90(95)%CL) requires the presence of light charginos (m χ ± 1 < ∼ 50 − 100 GeV depending on m t ). Since all sparticle masses are proportional to mg, m χ ± 1 < ∼ 100 GeV implies: (155) GeV, and mν < ∼ 100 (140) GeV in the no-scale (dilaton) flipped SU(5) supergravity model. The B(b → sγ) constraint excludes a significant fraction of the otherwise allowed region in the (m χ ± 1 , tan β) plane (irrespective of the magnitude of the chargino mass), while future experimental improvements will result in decisive tests of these models. In light of the ǫ 1 constraint, we conclude that the outlook for chargino and selectron detection at LEPII and at HERA is quite favorable in this class of models.

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Proton decay and cosmology strongly constrain the minimal SU(5) supergravity model

Cited by 46 publications

References 40 publications

Supersymmetric particle spectrum

Supersymmetric particle spectrum

Lowering αs by flipping SU(5)

Strongest experimental constraints on SU(5)×U(1) supergravity models

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