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

Majee, Swarup Kumar ; Parida, Mina K. ; Raychaudhuri, Amitava ; Sarkar, Utpal (2007) Low intermediate scales for leptogenesis in supersymmetric SO(10) grand unified theories Physical Review D - Particles, Fields, Gravitation and Cosmology, 75 (7). 075003_1-075003_14. ISSN 1550-7998

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Official URL: http://prd.aps.org/abstract/PRD/v75/i7/e075003

Related URL: http://dx.doi.org/10.1103/PhysRevD.75.075003

Abstract

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 (MR) 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 MR as required for leptogenesis. In the triplet model, independent of these corrections, we find a lower bound on the intermediate scale, MR>109 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 MR can even be in the TeV region which, apart from permitting resonant leptogenesis, can be tested at LHC and ILC.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:43201
Deposited On:10 Jun 2011 08:50
Last Modified:18 May 2016 00:16

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