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Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande

K. Abe,C. Bronner,Y. Hayato,M. Ikeda,S. Imaizumi,Hiroshi Itô,J. Kameda,Y. Kataoka,Makoto Miura,S. Moriyama,Y. Nagao,M. Nakahata,Yasuhiro Nakajima,S. Nakayama,T. Okada,Ken‐ichi Okamoto,A. Orii,G. Pronost,H. Sekiya,M. Shiozawa,Y. Sonoda,Yoshihiro Suzuki,Atsushi Takeda,Y. Takemoto,A. Takenaka,Hirohisa Tanaka,T. Yano,R. Akutsu,Shuo Han,T. Kajita,K. Okumura,Takuya Tashiro,R. Wang,J. Xia,D. Bravo-Berguño,L. Labarga,Ll. Marti,Bryan Zaldívar,F. d. M. Blaszczyk,E. Kearns,J. Gustafson,J. L. Raaf,J. L. Stone,L. Wan,T. Wester,J. G. Bian,N. J. Griskevich,W. R. Kropp,S. Locke,S. Mine,M. B. Smy,H. W. Sobel,Volodymyr Takhistov,P. Weatherly,J. Hill,J. Y. Kim,I. T. Lim,R. G. Park,B. Bodur,K. Scholberg,C. W. Walter,A. Coffani,O. Drapier,S. El Hedri,A. Giampaolo,M. Gonin,T. Mueller,Pascal Paganini,B. Quilain,T. Ishizuka,T. Nakamura,J. S. Jang,J. G. Learned,L. H. V. Anthony,A. A. Sztuc,Y. Uchida,V. Berardi,Maria Gabriella Catanesi,E. Radicioni,N. F. Calabria,L. N. Machado,G. De Rosa,G. Collazuol,F. Iacob,Mathieu Lamoureux,N. Ospina,L. Ludovici,Y. Nishimura,Shuo Cao,M. Friend,T. Hasegawa,Toru Ishida,T. Kobayashi,T. Matsubara,T. Nakadaira,M. Jakkapu,K. Nakamura,Y. Oyama,K. Sakashita,T. Sekiguchi,T. Tsukamoto,Y. Nakano,T. Shiozawa,A. Suzuki,Y. Takeuchi,S. Yamamoto,Ahmed Farag Ali,Yosuke Ashida,J. Feng,S. Hirota,A. K. Ichikawa,T. Kikawa,M. Mori,T. Nakaya,R. Wendell,K. Yasutome,P. Fernåndez,N. McCauley,Poonam Mehta,A. Pritchard,K. M. Tsui,Y. Fukuda,Y. Itow,H. Menjo,T. Niwa,K. Sato,M. Tsukada,P. Mijakowski,M. Posiadała-Zezula,C. K. Jung,C. Vilela,M. J. Wilking,C. Yanagisawa,Masayuki Harada,K. Hagiwara,T. Horai,H. Ishino,S. Ito,Y. Koshio,W.Y. Ma,N. Piplani,S. Sakai,Y. Kuno,G. Barr,D. Barrow,L. Cook,A. Goldsack,S. Samani,C. Simpson,D. Wark,F. Nova,T. Boschi,F. Di Lodovico,S. Molina Sedgwick,M. Taani,S. Zsoldos,J. Yang,S. J. Jenkins,J. M. McElwee,M. Thiesse,L. F. Thompson,M. Malek,O. Stone,H. Okazawa,S. B. Kim,I. Yu,K. Nishijima,M. Koshiba,Naoyuki Ogawa,K. Iwamoto,M. Yokoyama,K. Martens,M. R. Vagins,M. Kuze,S. Izumiyama,Masayuki Tanaka,T. Yoshida,M. Inomoto,M. Ishitsuka,R. Matsumoto,Kouji Ohta,M. Shinoki,J. F. Martin,Hirohisa Tanaka,T. Towstego,M. Hartz,A. Konaka,P. de Perio,N. W. Prouse,B. W. Pointon,S. Chen,B. D. Xu,B. Richards,B. Jamieson,John M. Walker,A. Minamino,G. Pintaudi,R. Sasaki

Physics

Particle physics

Baryon

2021

As a baryon number violating process with $\mathrm{\ensuremath{\Delta}}B=2$, neutron-antineutron oscillation ($n\ensuremath{\rightarrow}\overline{n}$) provides a unique test of baryon number conservation. We have performed a search for $n\ensuremath{\rightarrow}\overline{n}$ oscillation with bound neutrons in Super-Kamiokande, with the full dataset from its first four run periods, representing an exposure of $0.37\text{ }\text{ }\mathrm{Mton}\text{\ensuremath{-}}\mathrm{years}$. The search used a multivariate analysis trained on simulated $n\ensuremath{\rightarrow}\overline{n}$ events and atmospheric neutrino backgrounds and resulted in 11 candidate events with an expected background of 9.3 events. In the absence of statistically significant excess, we derived a lower limit on $\overline{n}$ appearance lifetime in $^{16}\mathrm{O}$ nuclei of $3.6\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }\mathrm{years}$ and on the neutron-antineutron oscillation time of ${\ensuremath{\tau}}_{n\ensuremath{\rightarrow}\overline{n}}>4.7\ifmmode\times\else\texttimes\fi{}{10}^{8}\text{ }\text{ }\mathrm{s}$ at 90% C.L.

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“Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande” is a paper by K. Abe C. Bronner Y. Hayato M. Ikeda S. Imaizumi Hiroshi Itô J. Kameda Y. Kataoka Makoto Miura S. Moriyama Y. Nagao M. Nakahata Yasuhiro Nakajima S. Nakayama T. Okada Ken‐ichi Okamoto A. Orii G. Pronost H. Sekiya M. Shiozawa Y. Sonoda Yoshihiro Suzuki Atsushi Takeda Y. Takemoto A. Takenaka Hirohisa Tanaka T. Yano R. Akutsu Shuo Han T. Kajita K. Okumura Takuya Tashiro R. Wang J. Xia D. Bravo-Berguño L. Labarga Ll. Marti Bryan Zaldívar F. d. M. Blaszczyk E. Kearns J. Gustafson J. L. Raaf J. L. Stone L. Wan T. Wester J. G. Bian N. J. Griskevich W. R. Kropp S. Locke S. Mine M. B. Smy H. W. Sobel Volodymyr Takhistov P. Weatherly J. Hill J. Y. Kim I. T. Lim R. G. Park B. Bodur K. Scholberg C. W. Walter A. Coffani O. Drapier S. El Hedri A. Giampaolo M. Gonin T. Mueller Pascal Paganini B. Quilain T. Ishizuka T. Nakamura J. S. Jang J. G. Learned L. H. V. Anthony A. A. Sztuc Y. Uchida V. Berardi Maria Gabriella Catanesi E. Radicioni N. F. Calabria L. N. Machado G. De Rosa G. Collazuol F. Iacob Mathieu Lamoureux N. Ospina L. Ludovici Y. Nishimura Shuo Cao M. Friend T. Hasegawa Toru Ishida T. Kobayashi T. Matsubara T. Nakadaira M. Jakkapu K. Nakamura Y. Oyama K. Sakashita T. Sekiguchi T. Tsukamoto Y. Nakano T. Shiozawa A. Suzuki Y. Takeuchi S. Yamamoto Ahmed Farag Ali Yosuke Ashida J. Feng S. Hirota A. K. Ichikawa T. Kikawa M. Mori T. Nakaya R. Wendell K. Yasutome P. Fernåndez N. McCauley Poonam Mehta A. Pritchard K. M. Tsui Y. Fukuda Y. Itow H. Menjo T. Niwa K. Sato M. Tsukada P. Mijakowski M. Posiadała-Zezula C. K. Jung C. Vilela M. J. Wilking C. Yanagisawa Masayuki Harada K. Hagiwara T. Horai H. Ishino S. Ito Y. Koshio W.Y. Ma N. Piplani S. Sakai Y. Kuno G. Barr D. Barrow L. Cook A. Goldsack S. Samani C. Simpson D. Wark F. Nova T. Boschi F. Di Lodovico S. Molina Sedgwick M. Taani S. Zsoldos J. Yang S. J. Jenkins J. M. McElwee M. Thiesse L. F. Thompson M. Malek O. Stone H. Okazawa S. B. Kim I. Yu K. Nishijima M. Koshiba Naoyuki Ogawa K. Iwamoto M. Yokoyama K. Martens M. R. Vagins M. Kuze S. Izumiyama Masayuki Tanaka T. Yoshida M. Inomoto M. Ishitsuka R. Matsumoto Kouji Ohta M. Shinoki J. F. Martin Hirohisa Tanaka T. Towstego M. Hartz A. Konaka P. de Perio N. W. Prouse B. W. Pointon S. Chen B. D. Xu B. Richards B. Jamieson John M. Walker A. Minamino G. Pintaudi R. Sasaki published in 2021. It has an Open Access status of “hybrid”. You can read and download a PDF Full Text of this paper here.