Towards a viable grand unified model with M ∼ Mstring and M ∼ 1012 GeV

Deshpande, N. G.; Dutta, Bhaskar; Keith, E.

doi:10.1016/0370-2693(96)00810-6

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…The breaking scale of the Pati-Salam gauge group is not significantly constrained by proton decay and can be as low as ∼ 10 TeV [35,36]. However, it is well known that supersymmetric Pati-Salam, broken at an intermediate scale ∼ 10 12 GeV, cannot achieve unification without additional charged fields [37]. An acceptable prediction for gauge coupling unification can be obtained however in a minimal supersymmetric Pati-Salam gauge group when PS is broken at the unification scale (for recent analyses of supersymmetric Pati-Salam, see [38] - [41]).…”

Section: Gauge Symmetry Breaking By Brane Fieldsmentioning

confidence: 99%

Unification in 5D SO(10)

Kim

Raby

2003

J. High Energy Phys.

111

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Gauge unification in a five dimensional supersymmetric SO(10) model compactified on an orbifold S 1 /(Z 2 × Z ′ 2 ) is studied. One orbifolding reduces N = 2 supersymmetry to N = 1, and the other breaks SO(10) to the Pati-Salam gauge group SU(4) C × SU(2) L × SU(2) R . Further breaking to the standard model gauge group is made through the Higgs mechanism on one of the branes. The differences of the three gauge couplings run logarithmically even in five dimensions and we can keep the predictability for unification as in four dimensional gauge theories. We obtain an excellent prediction for gauge coupling unification with a cutoff scale M * ∼ 3 × 10 17GeV and a compactification scale M c ∼ 1.5 × 10 14 GeV. Finally, although proton decay due to dimension 5 operators may be completely eliminated, the proton decay rate in these models is sensitive to the placement of matter multiplets in the 5th dimension, as well as to the unknown physics above the cutoff scale.

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Section: Gauge Symmetry Breaking By Brane Fieldsmentioning

confidence: 99%

Unification in 5D SO(10)

Kim

Raby

2003

J. High Energy Phys.

111

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“…However, in such cases, one of the most attractive features like b − τ Yukawa unification for smaller values of tan β has to be sacrificed [10,11]. On the other hand, SUSY SO (10) with an intermediate gauge symmetry like SU (2) L × SU (2) R × U (1) B−L × SU (3) C (≡ G 2213 ) [12][13][14][15][16] or SU (2) L × SU (2) R × SU (4) C (≡ G 224 ) [17][18][19][20], while providing a more natural value for M N , substantially lower than the GUT scale, has the potentialities to account for the b − τ Yukawa unification at the intermediate scale M I ≃ 10 9 − 10 13 GeV. In this context it has been demonstrated that desirable values of G 2213breaking scale with M I ≃ 10 9 − 10 13 are possible provided that a number of scalar components of full SO (10) Higgs representations are light with masses near the intermediate scale [13,14].…”

Section: Introductionmentioning

confidence: 99%

Precision and uncertainties in mass scale predictions in SUSY SO(10) with $SU(2)_{L}\times SU(2)_{R}\times U(1)_{B-L}\times SU(3)_C$ intermediate breaking

Parida¹,

Purkayastha²,

Das³

et al. 2003

Eur. Phys. J. C

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Abstract. In a class of SUSY SO(10) with SU (2)L ×SU (2)R×U (1)B−L ×SU (3)C (g2L = g2R) intermediate gauge symmetry, we observe that the prediction on the unification mass (MU ) is unaffected by Planckscale-induced gravitational and intermediate-scale-threshold effects, although the intermediate scale (MI ) itself is subject to such corrections. In particular, without invoking the presence of additional lighter scalar degrees of freedom but including plausible and reasonable threshold effects, we find that interesting solutions for neutrino physics corresponding to MI ≃ 10 10 − 10 13 GeV and MU ≃ (5 − 6) × 10 17 GeV are permitted in the minimal models. Possibilities of low-mass right-handed gauge bosons corresponding to MI ≃ 1 − 10 TeV consistent with the CERN-LEP data are pointed out in a number of models when threshold effects are included using effective mass parameters.

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“…The prospects to fill this gap by threshold corrections due to the infinite tower of massive string modes [27,28] seem rather restricted [29] as explicit calculations in superstring models show that such thresholds are very small [30]. This could be taken as an indication for the existence of intermediate scales in which extra matter states become massive and their thresholds increase the coupling unification scale up to M s [31,32,25]. One is thus motivated to incorporate this additional feature in a candidate GUT model.…”

Section: Introductionmentioning

confidence: 99%

String scale unification in an SU(6) × SU(2) GUT

Rizos

Tamvakis

1997

Physics Letters B

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We construct and analyze an SU(6)×SU(2) GUT. The model is k=1 string embedable in the sense that we employ only chiral representations allowed at the k=1 level of the associated Kač-Moody Algebra. Both cases SU(6) × SU(2) L and SU(6) × SU(2) R are realized. The model is characterized by the SU(6) × SU(2) → SU(4) × SU(2) × SU(2) breaking scale M X , and theThe spectrum bellow M R includes an extra pair of charge-1/3 colour-triplets of mass M I ≤ M R that does not couple to matter fields and, possibly, an extra pair of isodoublets. Above M X the SU(6) and SU(2) gauge couplings always unify at a scale which can be taken to be the string unification scale M s ∼ 5 × 1017 GeV . The model has Yukawa coupling unification since quarks and leptons obtain their masses from a single Yukawa coupling. Neutrinos obtain acceptably small masses through a see-saw mechanism. Coloured triplets that couple to matter fields are naturally split from the coexisting isodoublets without the need of any numerical fine tuning.

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Towards a viable grand unified model with M ∼ Mstring and M ∼ 1012 GeV

Cited by 9 publications

References 30 publications

Unification in 5D SO(10)

Unification in 5D SO(10)

Precision and uncertainties in mass scale predictions in SUSY SO(10) with $SU(2)_{L}\times SU(2)_{R}\times U(1)_{B-L}\times SU(3)_C$ intermediate breaking

String scale unification in an SU(6) × SU(2) GUT

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