Natural suppression of Higgsino-mediated proton decay in supersymmetric SO(10)

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.5354· OSTI ID:5686369

Babu, K S; Barr, S M ^[1]

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1. Bartol Research Institute, University of Delaware, Newark, Delaware 19716 (United States)

In supersymmetric grand unified theories, proton decay mediated by the color-triplet Higgsino is generally problematic and requires some fine-tuning of parameters. We present a mechanism which naturally suppresses such dimension-5 operators in the context of SUSY SO(10). The mechanism, which implements natural doublet-triplet splitting using the adjoint Higgs boson, converts these dimension-5 operators effectively into dimension 6. By explicitly computing the Higgs spectrum and the resulting threshold uncertainties we show that the successful prediction of sin[sup 2][theta][sub [ital W]] is maintained [ital as] [ital a] [ital prediction] in this scheme. It is argued that only a weak suppression of the Higgsino-mediated proton decay is achievable within SUSY SU(5) without fine-tuning, in contrast to a strong suppression in SUSY SO(10).

• DOE Contract Number: FG02-91ER40626
• OSTI ID: 5686369
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:11; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662210* -- Specific Theories & Interaction Models
662360 -- Decays of Baryons-- (1992-)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
HADRONS
HIGGS BOSONS
LIE GROUPS
MANY-DIMENSIONAL CALCULATIONS
MATHEMATICAL MODELS
NUCLEONS
PARTICLE DECAY
PARTICLE MODELS
POSTULATED PARTICLES
PROTONS
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
SO GROUPS
SO-10 GROUPS
SPECTRA
SU GROUPS
SU-5 GROUPS
SUPERSYMMETRY
SYMMETRY
SYMMETRY GROUPS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES