Proton Decay with a Light Gravitino or Axino

الأصل · EN

We consider the proton decay in supersymmetric models with a gravitino or axino lighter than the proton. This consideration leads to a stringent limit on the R parity and B violating Yukawa coupling of the superpotential operator Uᶜᵢ Dᶜⱼ Dᶜₖ as λ"₁₁₂ < 10⁻¹⁵ (m₃/₂/eV) for a light gravitino, and λ"₁₁₂ < 10⁻¹⁵ (Fₐ/ 10¹⁰ GeV) for a light DFSZ axino. For hadronic axino, the constraint is weakened by the factor of 10³.