Search for Proton Decay via $p \to e^+\pi^0$ and $p \to \mu^+\pi^0$  with an Enlarged Fiducial Mass of the Super-Kamiokande Detector

Takenaka, Akira

Search for Proton Decay via $p \to e^+\pi^0$ and $p \to \mu^+\pi^0$ with an Enlarged Fiducial Mass of the Super-Kamiokande Detector

Akira Takenaka
(
- Tokyo U.
)

Dec, 2020

190 pages

Thesis: PhD

University of Tokyo,
Tokyo U.

(Dec, 2020)

Published: 2020

Experiments:

SUPER-KAMIOKANDE

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Abstract: (submitter)

We have searched for proton decay via

p \to e^+\pi^0

and

p \to \mu^+\pi^0

modes using all Super-Kamiokande data until May 2018, in total 450 kton·years exposure. In this analysis, we have enlarged the Super-Kamiokande fiducial mass from 22.5 kton to 27.2 kton, and the 78 kton·years of enlarged fiducial mass region data has been analyzed for the first time. No candidates are found for

p \to e^+\pi^0

with 0.59 of expected atmospheric neutrino backgrounds, and one candidate is found for

p \to \mu^+\pi^0

with 0.94 of expected atmospheric neutrino backgrounds. The results are consistent with the expected number of backgrounds. Lower limits on the proton partial lifetime are set to be

\tau/B(p \to e^+\pi^0) > 2.4 \times 10^{34}

years and

\tau/B(p \to \mu^+\pi^0) > 1.6 \times 10^{34}

years at 90% confidence level. They are the wolrd’s most stringent constraints for these decay modes.

neutrino: background
p: decay
neutrino: atmosphere
KAMIOKANDE
p: lifetime
lifetime: lower limit
p: decay modes
p --> positron pi0
p --> muon+ pi0

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