Search For N - (N)Over-Bar Oscillation In Super-Kamiokande

Keiko Abe, Kimberly K Washburn,Takuji Iwashita,J Kameda,W E Keig,Koichi Ishihara,Ko Okumura,Keizo Inoue,Hiroo Sekiya,S A Dazeley,F Dufour,Y Choi,N Tanimoto,R Gran,I T Lim,H Nishino,H Ishino,Tsutomu Iida,K Kobayashi,M D Messier,Yukari Totsuka,G Mitsuka,Masanori Ikeda, Yoshiyuki Takeuchi,C Saji,S B Kim,Masanori Koshiba,B L Hartfiel,M Sakuda,C Ishihara,Hideto Ishii,R Wendell,T Sasaki,S Nakayama,J Griskevich,Takaaki Nakaya,Yuh Fukuda,Y Koshio,Atsushi Takeda,Yutaka Watanabe,R J Wilkes,B S Yang,J C Hill,Shinichiro Mine,T Kajita,M Shiozawa,S Likhoded,M Yokoyama, Hiromasa Ogawa,Y Gando, Wei Wang,H W Sobel,D Kielczewska,J G Learned,M Nakahata,T Kobayashi,R Svoboda,K Nishijima,R Terri,K Scholberg, E V Thrane,J S Jang,M Miura,A Herfurth, Hideaki Tanaka,Y Takenaga,M Yoshida,C K Jung,K S Ganezer,A K Ichikawa,K Nitta,E Kearns,Stephen H Clark,Hatae Maesaka,Masaki Ishitsuka,D Casper,G Guillian,T Ishizuka,M R Vagins,C Regis,R W Ellsworth,M Litos,Shingo Hatakeyama,Yoshitaka Kuno,Y Obayashi,I S Jeoung,S Matsuno,Koji Nakamura,Hiroyasu Sato,T J Haines,J L Raaf,Y Hayato, Itsuro Higuchi,C Mcgrew,L Sulak,M Goldhaber,K Shiraishi,A Habig,J L Stone, Suguru Yamamoto,T Ishii,D W Liu,Y Oyama,C Yanagisawa,K Ueshima,G W Sullivan,Teruaki Koike,Hiroshi Watanabe,Zhengtao Deng,Toshiaki Ishida,Shunsuke Moriyama,C Mitsuda,C W Walter,Y Itow,W R Kropp,H G Berns,H K Seo,S Desai,K Kaneyuki,J A Dunmore,K Nishikawa,A Minamino,Naohisa Tamura,Yuan Liu,A Sarrat,A Suzuki, Toshiji Kato,T Nakadaira,H Okazawa,S Chen,J P Cravens, Yoshiaki Suzuki, Toshihiro Hasegawa,M Hasegawa,Sadatomo Tasaka,Jin Young Kim,M B Smy

PHYSICAL REVIEW D（2015）

Cited 73|Views53

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Abstract

A search for neutron-antineutron (n - (n) over bar n) oscillation was undertaken in Super-Kamiokande using the 1489 live-day or 2.45 x 10(34) neutron-year exposure data. This process violates both baryon and baryon minus lepton numbers by an absolute value of two units and is predicted by a large class of hypothetical models where the seesaw mechanism is incorporated to explain the observed tiny neutrino masses and the matter-antimatter asymmetry in the Universe. No evidence for n - (n) over bar oscillation was found; the lower limit of the lifetime for neutrons bound in O-16, in an analysis that included all of the significant sources of experimental uncertainties, was determined to be 1.9 x 10(32) years at the 90% confidence level. The corresponding lower limit for the oscillation time of free neutrons was calculated to be 2.7 x 10(8) s using a theoretical value of the nuclear suppression factor of 0.517 x 10(23) s(-1) and its uncertainty.

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Key words

oscillations,oxygen,monte carlo,confidence level,gauge theory,high energy physics

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