Proton decay, annihilation or fusion?

@article{Wu1985ProtonDA,
  title={Proton decay, annihilation or fusion?},
  author={Dan-di Wu and Tie-zhong Li},
  journal={Zeitschrift f{\"u}r Physik C Particles and Fields},
  year={1985},
  volume={27},
  pages={321-323}
}
The proton decay candidatep→μ+η of Kamioka NDE in Japan, if seriously taken, probably means that fusion is the only mechanism of proton decay. A model based on the work of Pati-Salam-Sarkar is discussed in detail. 

References

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Possible proton decays in theSU(4)C ×SU(2)L×SU(2)R unification model are discussed. There are some characteristics in the decay products, which are different from those in the standardSU(5) orSO (10)
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Strong, electromagnetic, and weak forces are conjectured to arise from a single fundamental interaction based on the gauge group SU(5).
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Universal strong, weak, and electromagnetic interactions of leptons and hadrons are generated by gauging a non-Abelian renormalizable anomaly-free subgroup of the fundamental symmetry structure
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