Search for proton decay via p→e+π0 and p→μ+π0 in 0.31  megaton·years exposure of the Super-Kamiokande water Cherenkov detector

(Super-Kamiokande Collaboration)

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

We have searched for proton decay via p→e+π0 and p→μ+π0 using Super-Kamiokande data from April 1996 to March 2015, 0.306 megaton·years exposure in total. The atmospheric neutrino background rate in Super-Kamiokande IV is reduced to almost half that of phase I-III by tagging neutrons associated with neutrino interactions. The reach of the proton lifetime is further enhanced by introducing new signal criteria that select the decay of a proton in a hydrogen atom. No candidates were seen in the p→e+π0 search. Two candidates that passed all of the selection criteria for p→μ+π0 have been observed, but these are consistent with the expected number of background events of 0.87. Lower limits on the proton lifetime are set at τ/B(p→e+π0)>1.6×1034 years and τ/B(p→μ+π0)>7.7×1033 years at 90% confidence level.

Original languageEnglish
Article number012004
JournalPhysical Review D
Volume95
Issue number1
DOIs
Publication statusPublished - 2017 Jan 6
Externally publishedYes

Fingerprint

protons
detectors
decay
water
neutrinos
life (durability)
marking
confidence
hydrogen atoms
neutrons
interactions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Search for proton decay via p→e+π0 and p→μ+π0 in 0.31  megaton·years exposure of the Super-Kamiokande water Cherenkov detector. / (Super-Kamiokande Collaboration).

In: Physical Review D, Vol. 95, No. 1, 012004, 06.01.2017.

Research output: Contribution to journalArticle

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abstract = "We have searched for proton decay via p→e+π0 and p→μ+π0 using Super-Kamiokande data from April 1996 to March 2015, 0.306 megaton·years exposure in total. The atmospheric neutrino background rate in Super-Kamiokande IV is reduced to almost half that of phase I-III by tagging neutrons associated with neutrino interactions. The reach of the proton lifetime is further enhanced by introducing new signal criteria that select the decay of a proton in a hydrogen atom. No candidates were seen in the p→e+π0 search. Two candidates that passed all of the selection criteria for p→μ+π0 have been observed, but these are consistent with the expected number of background events of 0.87. Lower limits on the proton lifetime are set at τ/B(p→e+π0)>1.6×1034 years and τ/B(p→μ+π0)>7.7×1033 years at 90{\%} confidence level.",
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