MSGUT: spectra, couplings and threshold effects

Aulakh, Charanjit S.; Girdhar, Aarti

doi:10.1016/j.nuclphysb.2005.01.008

Cited by 115 publications

(282 citation statements)

References 35 publications

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“…In this case, the neutrino mass matrix can be thought of as having the form displayed in Eq. (19), with the first termM R (proportional to the type-II seesaw contribution) enhanced or diminished, depending on the relative phase between the two contributions. We find that if the type-II term is close to zero (that is, both contributions have about the same magnitude and the relative phase is close to π) then we can again get good fits for the neutrino sector.…”

Section: −1mmentioning

confidence: 99%

Neutrino masses and mixings in a minimal SO (10) model

2005

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We consider a minimal formulation of SO(10) Grand Unified Theory wherein all the fermion masses arise from Yukawa couplings involving one 126 and one 10 of Higgs multiplets. It has recently been recognized that such theories can explain, via the type-II seesaw mechanism, the large ν µ −ν τ mixing as a consequence of b−τ unification at the GUT scale. In this picture, however, the CKM phase δ lies preferentially in the second quadrant, in contradiction with experimental measurements. We revisit this minimal model and show that the conventional type-I seesaw mechanism generates phenomenologically viable neutrino masses and mixings, while being consistent with CKM CP violation. We also present improved fits in the type-II seesaw scenario and suggest fully consistent fits in a mixed scenario.

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Section: −1mmentioning

confidence: 99%

Neutrino masses and mixings in a minimal SO (10) model

2005

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“…The doublet pair H, H is a linear combination [12,27,26] of the 6 doublet pairs of the the NMSGUT : (27) where U,U diagonalize the doublet mass matrix H : U T H U = Diag{µ, M H 2 , ...., M H 6 } to positive masses. They are calculated with µ = 0 = Det(H ).…”

Section: Inflation and Neutrino Masses In The Nmsgutmentioning

confidence: 99%

Susy seesaw inflation and NMSO(10)GUT

Aulakh¹

2013

AIP Conference Proceedings

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Abstract. We show that Supersymmetric models with Type I seesaw neutrino masses support slow roll inflection point inflation. The inflaton is the D-flat direction labelled by the chiral invariant HLN composed of the Higgs(H), slepton(L) and conjugate sneutrino(N) superfields. The scale of inflation and fine tuning is set by the conjugate neutrino Majorana mass M ν c ∼ 10 6 − 10 12 GeV. The cubic term in the (quartic) inflaton potential is dominantly from superpotential (not soft Susy breaking) couplings. The tuning conditions are thus insensitive to soft supersymmetry breaking parameters and are generically much less stringent than for previous 'A-term' inflation scenarios controlled by mass scales ∼ TeV . WMAP limits on the ratio of tensor to scalar perturbations limit the scale M controlling inflection point inflation: M < 7.9 × 10 13 GeV. 'Instant preheating' is operative and dumps the inflaton energy into MSSM modes giving a high reheat temperature :ν c 10 6 GeV ∼ 10 11 − 10 15 GeV. A large gravitino mass > 50 TeV is therefore required to avoid over closure by reheat produced gravitinos. 'Instant preheating' and NLH inflaton facilitate production of right handed neutrinos during inflaton decay and thus non-thermal leptogenesis in addition to thermal leptogenesis. We show that the embedding in the fully realistic New Minimal Supersymmetric SO(10) GUT requires use of the heaviest righthanded neutrino mass as the controlling scale but the possibility of a measurable tensor scalar perturbation ratio seems marginal. We examine the parametric difficulties remaining.

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“…The Higgs fields which can couple to the fermion bi-linears 16 i 16 j are 10 H , 126 H and 120 H , with the couplings of the 10 H and 126 H being symmetric in flavor indices (i, j) and those of the 120 H being antisymmetric. The terms in these Yukawa couplings that are relevant to the generation of the d = 7 operators are given below [16,17].…”

Section: Baryon Number Violating D = 7 Operatorsmentioning

confidence: 99%

B−Lviolating nucleon decay and GUT scale baryogenesis inSO(10)

Babu

Mohapatra

2012

Phys. Rev. D

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We show that grand unified theories based on SO(10) generate naturally the nextto-leading baryon number violating operators of dimension seven. These operators, which violate (B − L), lead to unconventional decays of the nucleon such as n → e − K + , e − π + and p → νπ + . In two-step breaking schemes of non-supersymmetric SO(10), nucleon lifetime for decays into these modes is found to be within reach of experiments. We also identify supersymmetric scenarios where these decays may be accessible, consistent with gauge coupling unification. Further, we show that the (B − L)-asymmetry generated in the decays of GUT scale scalar bosons and/or gauge bosons can explain consistently the observed baryon asymmetry of the universe.The induced (B − L) asymmetry is sphaleron-proof, and survives down to the weak scale without being erased by the electroweak interactions. This mechanism works efficiently in a large class of non-SUSY and SUSY SO(10) models, with either a 126 H or a 16 H Higgs field employed for rank reduction. In minimal models the induced baryon asymmetry is tightly connected to the masses of quarks, leptons and neutrinos and is found to be compatible with observations. *

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MSGUT: spectra, couplings and threshold effects

Cited by 115 publications

References 35 publications

Neutrino masses and mixings in a minimal SO (10) model

Neutrino masses and mixings in a minimal SO (10) model

Susy seesaw inflation and NMSO(10)GUT

B−Lviolating nucleon decay and GUT scale baryogenesis inSO(10)

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