No evidence for proton decay p to e+ pi0 pi0 or p to mu+ pi0 pi0 was found beyond atmospheric neutrino background, setting lifetime limits of 7.2e33 and 4.5e33 years at 90% CL.
Takenakaet al.(Super-Kamiokande Collaboration), Search for proton decay viap→e +π0 andp→µ +π0 with an enlarged fiducial volume in super-kamiokande i- iv, Phys
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Search for proton decay via $p \to e^{+}\pi^{0}\pi^{0}$ and $p \to \mu^{+}\pi^{0}\pi^{0}$ in 0.401 megaton-years exposure of Super-Kamiokande I-V
No evidence for proton decay p to e+ pi0 pi0 or p to mu+ pi0 pi0 was found beyond atmospheric neutrino background, setting lifetime limits of 7.2e33 and 4.5e33 years at 90% CL.