B-L Violating Nucleon Decay and GUT Scale Baryogenesis in SO(10)

Abstract

We show that grand unified theories based on SO(10) generate naturally the next-to-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 or a 16 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.

26 pages, 9 figures

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Cited by in corpus (26)

• Extending the Standard Model Effective Field Theory with the Complete Set of Dimension-7 Operators
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• Dimension Seven Operators in Standard Model with Right handed Neutrinos
• A Minimal Non-Supersymmetric $SO(10)$ Model: Gauge Coupling Unification, Proton Decay and Fermion masses
• Light color octet scalars in the minimal SO(10) grand unification
• Cosmic Coincidence and Asymmetric Dark Matter in a Stueckelberg Extension
• Coupling Unification, GUT-Scale Baryogenesis and Neutron-Antineutron Oscillation in SO(10)
• B-L Violating Proton Decay Modes and New Baryogenesis Scenario in SO(10)
• LHC-scale left-right symmetry and unification
• Fermion Masses and Mixings, Leptogenesis and Baryon Number Violation in Pati-Salam Model
• Observable Proton Decay from Planck Scale Physics
• Proton lifetime in the minimal SO(10) GUT and its implications for the LHC
• Proton decay and new contribution to neutrino-less double beta decay in SO(10) with low-mass Z-prime boson, observable n-nbar oscillation, lepton flavor violation, and rare kaon decay
• Determining Majorana Nature of Neutrino from Nucleon Decays and n-nbar oscillations
• An Analysis of B-L=-2 Operators from Matter-Higgs Interactions in a Class of Supersymmetric SO(10) Models
• Sensitivity to light weakly-coupled new physics at the precision frontier
• $B-L$ violating nucleon decays as a probe of leptoquarks and implications for baryogenesis
• Scalar Dark Matter, GUT baryogenesis and Radiative neutrino mass
• Tracking Down the Route to the SM with Inflation and Gravitational Waves
• Spectrum of colour sextet scalars in realistic SO(10) GUT
• Neutrino assisted GUT baryogenesis - revisited
• On the Seesaw Scale in Supersymmetric SO(10) Models
• Structure and prospects of the simplest SO(10) GUTs
• Effective Sextic Superpotential and $B-L$ violation in NMSGUT
• Constraining scalars of $16_H$ through proton decays in non-renormalisable $SO(10)$ models
• R-parity violation in SU(5)