GiBUU simulations show proton decay detection efficiency in water Cherenkov detectors matches previous estimates, while Fermi momentum choice significantly affects atmospheric neutrino background rates and is the leading systematic.
Search for Proton Decay via p -> e+ pi0 in a Large Water Cherenkov Detector
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abstract
We have searched for proton decay via p -> e+ pi0 using data from a 25.5 kton-year exposure of the Super-Kamiokande detector. We find no candidate events with an expected background induced by atmospheric neutrinos of 0.1 events. From these data, we set a lower limit on the partial lifetime of the proton to be 1.6E33 years at a 90% confidence level.
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Understanding the impact of nuclear effects on proton decay searches with the GiBUU model
GiBUU simulations show proton decay detection efficiency in water Cherenkov detectors matches previous estimates, while Fermi momentum choice significantly affects atmospheric neutrino background rates and is the leading systematic.