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Search for Proton Decay via $p\to e^+π^0$ and $p\to μ^+π^0$ with an Enlarged Fiducial Volume in Super-Kamiokande I-IV

Publication ,  Journal Article
Collaboration, S-K; Takenaka, A; Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Kameda, J; Kataoka, Y; Kato, Y; Kishimoto, Y ...
October 30, 2020

We have searched for proton decay via $p\to e^+\pi^0$ and $p\to \mu^+\pi^0$ modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds to 450 kton$\cdot$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$\cdot$years of data, including 78 kton$\cdot$years of additional fiducial volume data, has been newly analyzed. No candidates have been found for $p\to e^+\pi^0$ and one candidate remains for $p\to \mu^+\pi^0$ 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: $\tau/B(p\to e^+\pi^0) > 2.4 \times 10^{34}$ years and $\tau/B(p\to \mu^+\pi^0) > 1.6 \times 10^{34}$ years at 90% confidence level.

Duke Scholars

Publication Date

October 30, 2020
 

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Collaboration, S.-K., Takenaka, A., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., … Sasaki, R. (2020). Search for Proton Decay via $p\to e^+π^0$ and $p\to μ^+π^0$ with an Enlarged Fiducial Volume in Super-Kamiokande I-IV.
Collaboration, Super-Kamiokande, A. Takenaka, K. Abe, C. Bronner, Y. Hayato, M. Ikeda, S. Imaizumi, et al. “Search for Proton Decay via $p\to e^+π^0$ and $p\to μ^+π^0$ with an Enlarged Fiducial Volume in Super-Kamiokande I-IV,” October 30, 2020.
Collaboration S-K, Takenaka A, Abe K, Bronner C, Hayato Y, Ikeda M, et al. Search for Proton Decay via $p\to e^+π^0$ and $p\to μ^+π^0$ with an Enlarged Fiducial Volume in Super-Kamiokande I-IV. 2020 Oct 30;
Collaboration S-K, Takenaka A, Abe K, Bronner C, Hayato Y, Ikeda M, Imaizumi S, Ito H, Kameda J, Kataoka Y, Kato Y, Kishimoto Y, Marti L, Miura M, Moriyama S, Mochizuki T, Nagao Y, Nakahata M, Nakajima Y, Nakayama S, Okada T, Okamoto K, Orii A, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Tanaka H, Yano T, Akutsu R, Han S, Kajita T, Okumura K, Tashiro T, Wang R, Xia J, Bravo-Berguno D, Labarga L, Fernandez P, Zaldivar B, Blaszczyk FDM, Kearns E, Raaf JL, Stone JL, Wan L, Wester T, Pointon BW, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Weatherly P, Ganezer KS, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Coffani A, Drapier O, Hedri SE, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Matsuno S, Anthony LHV, Litchfield RP, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, Rosa GD, Collazuol G, Iacob F, Lamoureux M, Ospina N, Ludovici L, Nishimura Y, Cao S, Friend M, Hasegawa T, Ishida T, Jakkapu M, Kobayashi T, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Hasegawa M, Isobe Y, Miyabe H, Nakano Y, Shiozawa T, Sugimoto T, Suzuki AT, Takeuchi Y, Yamamoto S, Ali A, Ashida Y, Feng J, Hirota S, Ichikawa AK, Jiang M, Kikawa T, Mori M, Nakamura KE, Nakaya T, Wendell RA, Yasutome K, McCauley N, Mehta P, Pritchard A, Tsui KM, Fukuda Y, Itow Y, Menjo H, Niwa T, Sato K, Taani M, Tsukada M, Mijakowski P, Frankiewicz K, Jung CK, Santucci G, Vilela C, Wilking MJ, Yanagisawa C, Fukuda D, Harada M, Hagiwara K, Horai T, Ishino H, Ito S, Koshio Y, Ma W, Piplani N, Sakai S, Sakuda M, Takahira Y, Xu C, Kuno Y, Barr G, Barrow D, Cook L, Simpson C, Wark D, Nova F, Boschi T, Lodovico FD, Sedgwick SM, Zsoldos S, Yang JY, Jenkins SJ, McElwee JM, Thiesse MD, Thompson LF, Okazawa H, Choi Y, Kim SB, Yu I, Nishijima K, Koshiba M, Iwamoto K, Ogawa N, Yokoyama M, Goldsack A, Martens K, Vagins MR, Kuze M, Tanaka M, Yoshida T, Inomoto M, Ishitsuka M, Matsumoto R, Ohta K, Shinoki M, Martin JF, Nantais CM, Tanaka HA, Towstego T, Hartz M, Konaka A, Perio PD, Prouse NW, Chen S, Xu BD, Posiadala-Zezula M, Richards B, Jamieson B, Walker J, Minamino A, Pintaudi G, Sasaki R. Search for Proton Decay via $p\to e^+π^0$ and $p\to μ^+π^0$ with an Enlarged Fiducial Volume in Super-Kamiokande I-IV. 2020 Oct 30;

Publication Date

October 30, 2020