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We explore the neutrino signals from proton decays catalyzed by GUT monopolesin the Sun. Three typical proton decay modes, $p \rightarrow e^+ + (\rho^0,\eta, \omega...) \rightarrow \pi^+$, $p \rightarrow \mu^+ K^0$ and $p\rightarrow \bar{\nu}_e \pi^+$, have been analyzed for the Super-Kamiokandeexperiment. The monopole-induced neutrinos arise from interactions andsubsequent decays of the proton decay products. To obtain the neutrino energyspectra, we use the Geant4 software to simulate propagations of daughterparticles in the highly-dense solar center. It is found that $K^0$ can producea large amount of 236 MeV monoenergetic $\nu_\mu$ neutrinos through the chargeexchange process $K^0 + p \rightarrow K^+ + n$ and the subsequent decay $K^+\rightarrow \mu^+ \nu_\mu$ at rest. Based on this interesting feature, $p\rightarrow \mu^+ K^0$ can give the best discovery potential among three decaymodes for most of the parameter space. In addition, we present theSuper-Kamiokande sensitivities to the monopole flux for three proton decaymodes.

Exploring neutrinos from proton decays catalyzed by GUT monopoles in the Sun