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

Published

Journal Article

© 2017 American Physical Society. 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.

Full Text

Duke Authors

Cited Authors

  • Abe, K; Haga, Y; Hayato, Y; Ikeda, M; Iyogi, K; Kameda, J; Kishimoto, Y; Miura, M; Moriyama, S; Nakahata, M; Nakajima, T; Nakano, Y; Nakayama, S; Orii, A; Sekiya, H; Shiozawa, M; Takeda, A; Tanaka, H; Tomura, T; Wendell, RA; Akutsu, R; Irvine, T; Kajita, T; Kaneyuki, K; Nishimura, Y; Richard, E; Okumura, K; Labarga, L; Fernandez, P; Gustafson, J; Kachulis, C; Kearns, E; Raaf, JL; Stone, JL; Sulak, LR; Berkman, S; Nantais, CM; Tanaka, HA; Tobayama, S; Goldhaber, M; Kropp, WR; Mine, S; Weatherly, P; Smy, MB; Sobel, HW; Takhistov, V; Ganezer, KS; Hartfiel, BL; Hill, J; Hong, N; Kim, JY; Lim, IT; Park, RG; Himmel, A; Li, Z; O'Sullivan, E; Scholberg, K; Walter, CW; Wongjirad, T; Ishizuka, T; Tasaka, S; Jang, JS; Learned, JG; Matsuno, S; Smith, SN; Friend, M; Hasegawa, T; Ishida, T; Ishii, T; Kobayashi, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Suzuki, AT

Published Date

  • January 6, 2017

Published In

Volume / Issue

  • 95 / 1

Electronic International Standard Serial Number (EISSN)

  • 2470-0029

International Standard Serial Number (ISSN)

  • 2470-0010

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.95.012004

Citation Source

  • Scopus