Low intermediate scales for leptogenesis in supersymmetric SO(10) grand unified theories

Journal Article · Sun Apr 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.075003· OSTI ID:21020297

Majee, Swarup Kumar; Raychaudhuri, Amitava ^[1]; Parida, Mina K ^[1]; Sarkar, Utpal ^[2]

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1. Harish-Chandra Research Institute, Jhunsi, Allahabad 211 019 (India)
2. Physical Research Laboratory, Ahmedabad 380 009 (India)

A low intermediate scale within minimal supersymmetric SO(10) GUTs is a desirable feature to accommodate leptogenesis. We explore this possibility in models where the intermediate gauge symmetry breaks spontaneously by (a) doublet Higgs scalars and also (b) by triplets. In both scenarios, gauge coupling unification requires the scale of left-right symmetry breaking (M{sub R}) to be close to the unification scale. This will entail unnaturally small neutrino Yukawa couplings to avoid the gravitino problem and allow successful leptogenesis. We point out that any one of three options--threshold corrections due to the mass spectrum near the unification scale, gravity induced nonrenormalizable operators near the Planck scale, or presence of additional light Higgs multiplets--can permit unification along with much lower values of M{sub R} as required for leptogenesis. In the triplet model, independent of these corrections, we find a lower bound on the intermediate scale, M{sub R}>10{sup 9} GeV, arising from the requirement that the theory must remain perturbative at least up to the GUT scale. We show that in the doublet model M{sub R} can even be in the TeV region which, apart from permitting resonant leptogenesis, can be tested at LHC and ILC.

• OSTI ID: 21020297
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CERN LHC
CORRECTIONS
COUPLING
GAUGE INVARIANCE
GEV RANGE
GRAND UNIFIED THEORY
GRAVITATION
HIGGS BOSONS
HIGGS MODEL
MASS SPECTRA
NEUTRINOS
SCALARS
SO-10 GROUPS
SUPERSYMMETRY
SYMMETRY BREAKING
TEV RANGE
TRIPLETS