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

May, 1993
39 pages
Published in:
  • Phys.Rev.D 48 (1993) 5354-5364
e-Print:
Report number:
  • BA-93-26

Citations per year

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Abstract:
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)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 2θW\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)SU(5) without fine--tuning, in contrast to a strong suppression in SUSY SO(10)SO(10).
  • grand unified theory: SO(10)
  • grand unified theory: SU(5) x U(1)
  • supersymmetry
  • p: decay
  • decay: p
  • postulated particle: Higgsino
  • color: triplet
  • symmetry breaking: gauge
  • Higgs particle: doublet
  • Higgs particle: triplet