Search for proton decay via <i>p</i> → <i>e</i><SUP>+</SUP>π<SUP>0</SUP> and <i>p</i> → μ<SUP>+</SUP>π<SUP>0</SUP> with an enlarged fiducial volume in Super-Kamiokande I-IV



Takenaka, A, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Ito, H, Kameda, J, Kataoka, Y, Kato, Y
et al (show 204 more authors) (2020) Search for proton decay via <i>p</i> → <i>e</i><SUP>+</SUP>π<SUP>0</SUP> and <i>p</i> → μ<SUP>+</SUP>π<SUP>0</SUP> with an enlarged fiducial volume in Super-Kamiokande I-IV. PHYSICAL REVIEW D, 102 (11). 112011-.

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Abstract

We have searched for proton decay via p→e+π0 and p→μ+π0 modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds to 450 kton·years exposure. We have accumulated about 25% more livetime and enlarged the fiducial volume of the Super-Kamiokande detector from 22.5 kton to 27.2 kton for this analysis, so that 144 kton·years of data, including 78 kton·years of additional fiducial volume data, has been newly analyzed. No candidates have been found for p→e+π0 and one candidate remains for p→μ+π0 in the conventional 22.5 kton fiducial volume and it is consistent with the atmospheric neutrino background prediction. We set lower limits on the partial lifetime for each of these modes: τ/B(p→e+π0)>2.4×1034 years and τ/B(p→μ+π0)>1.6×1034 years at 90% confidence level.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 22 Jan 2021 11:07
Last Modified: 21 Jun 2024 17:54
DOI: 10.1103/PhysRevD.102.112011
Open Access URL: https://journals.aps.org/prd/abstract/10.1103/Phys...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3114516