Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-06-07
Phys.Rev.D48:5354-5364,1993
Physics
High Energy Physics
High Energy Physics - Phenomenology
39 pages (3 Feynman graphs not included), in Plain LaTeX, BA-93-26
Scientific paper
10.1103/PhysRevD.48.5354
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, 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 $\sin^2\theta_W$ is maintained {\it as a 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 $SO(10)$.
Babu K. S.
Barr Sandra M.
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