Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande
Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande
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DOI：
10.1103/physrevd.103.012008
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发表时间：
2021-01
影响因子：
5
通讯作者：
K. Abe;C. Bronner;Y. Hayato;M. Ikeda;S. Imaizumi;H. Ito;J. Kameda;Y. Kataoka;M. Miura;S. Moriyama;Y. Nagao;M. Nakahata;Y. Nakajima;S. Nakayama;T. Okada;K. Okamoto;A. Orii;G. Pronost;H. Sekiya;M. Shiozawa;Y. Sonoda;Y. Suzuki;A. Takeda;Y. Takemoto;A. Takenaka;H. Tanaka;T. Yano;R. Akutsu;S. Han;T. Kajita;K. Okumura;T. Tashiro;R. Wang;J. Xia;D. Bravo-Berguño;L. Labarga;L. Marti;B. Zaldivar;F. Blaszczyk;E. Kearns;J. Gustafson;J. Raaf;J. Stone;L. Wan;T. Wester;J. Bian;N. J. Griskevich;W. Kropp;S. Locke;S. Mine;M. Smy;H. Sobel;V. Takhistov;P. Weatherly;J. Hill;J. Y. Kim-J. Y.-Kim-2110622921;I. Lim;R. Park;B. Bodur;K. Scholberg;C. Walter;A. Coffani;O. Drapier;S. El Hedri;A. Giampaolo;M. Gonin;T. Mueller;P. Paganini;B. Quilain;T. Ishizuka;T. Nakamura;J. Jang;J. Learned;L. Anthony;A. Sztuc;Y. Uchida;V. Berardi;M. Catanesi;E. Radicioni;N. Calabria;L. Machado;G. De Rosa;G. Collazuol;F. Iacob;M. Lamoureux;N. Ospina;L. Ludovici;Y. Nishimura;S. Cao;M. Friend;T. Hasegawa;T. 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;A. Ali;Y. Ashida;J. Feng;S. Hirota;A. Ichikawa;T. Kikawa;M. Mori;T. Nakaya;R. Wendell;K. Yasutome;P. Fernandez;N. McCauley;P. Mehta;A. Pritchard;K. Tsui;Y. Fukuda;Y. Itow;H. Menjo;T. Niwa;K. Sato;M. Tsukada;P. Mijakowski;M. Posiadala-Zezula;C. Jung;C. Vilela;M. Wilking;C. Yanagisawa;M. Harada;K. Hagiwara;T. Horai;H. Ishino;S. Ito;Y. Koshio;W. 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. Y. Yang-J. Y.-Yang-2124818644;S. Jenkins;J. McElwee;M. Thiesse;L. Thompson;M. Malek;O. Stone;H. Okazawa;S. B. Kim-S. B.-Kim-2109632697;I. Yu;K. Nishijima;M. Koshiba;N. Ogawa;K. Iwamoto;M. Yokoyama;K. Martens;M. Vagins;M. Kuze;S. Izumiyama;M. Tanaka;T. Yoshida;M. Inomoto;M. Ishitsuka;R. Matsumoto;K. Ohta;M. Shinoki;J. F. Martin-J. F.-Martin-2110018099;H. A. Tanaka-H. A.-Tanaka-1390470446;T. Towstego;M. Hartz;A. Konaka;P. de Perio;N. Prouse;B. Pointon;S. Chen;B. D. Xu-B. D.-Xu-2258291899;B. Richards;B. Jamieson;J. Walker;A. Minamino;G. Pintaudi;R. Sasaki
中科院分区：
文献类型：
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作者：
K. Abe;C. Bronner;Y. Hayato;M. Ikeda;S. Imaizumi;H. Ito;J. Kameda;Y. Kataoka;M. Miura;S. Moriyama;Y. Nagao;M. Nakahata;Y. Nakajima;S. Nakayama;T. Okada;K. Okamoto;A. Orii;G. Pronost;H. Sekiya;M. Shiozawa;Y. Sonoda;Y. Suzuki;A. Takeda;Y. Takemoto;A. Takenaka;H. Tanaka;T. Yano;R. Akutsu;S. Han;T. Kajita;K. Okumura;T. Tashiro;R. Wang;J. Xia;D. Bravo-Berguño;L. Labarga;L. Marti;B. Zaldivar;F. Blaszczyk;E. Kearns;J. Gustafson;J. Raaf;J. Stone;L. Wan;T. Wester;J. Bian;N. J. Griskevich;W. Kropp;S. Locke;S. Mine;M. Smy;H. Sobel;V. Takhistov;P. Weatherly;J. Hill;J. Y. Kim-J. Y.-Kim-2110622921;I. Lim;R. Park;B. Bodur;K. Scholberg;C. Walter;A. Coffani;O. Drapier;S. El Hedri;A. Giampaolo;M. Gonin;T. Mueller;P. Paganini;B. Quilain;T. Ishizuka;T. Nakamura;J. Jang;J. Learned;L. Anthony;A. Sztuc;Y. Uchida;V. Berardi;M. Catanesi;E. Radicioni;N. Calabria;L. Machado;G. De Rosa;G. Collazuol;F. Iacob;M. Lamoureux;N. Ospina;L. Ludovici;Y. Nishimura;S. Cao;M. Friend;T. Hasegawa;T. 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;A. Ali;Y. Ashida;J. Feng;S. Hirota;A. Ichikawa;T. Kikawa;M. Mori;T. Nakaya;R. Wendell;K. Yasutome;P. Fernandez;N. McCauley;P. Mehta;A. Pritchard;K. Tsui;Y. Fukuda;Y. Itow;H. Menjo;T. Niwa;K. Sato;M. Tsukada;P. Mijakowski;M. Posiadala-Zezula;C. Jung;C. Vilela;M. Wilking;C. Yanagisawa;M. Harada;K. Hagiwara;T. Horai;H. Ishino;S. Ito;Y. Koshio;W. 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. Y. Yang-J. Y.-Yang-2124818644;S. Jenkins;J. McElwee;M. Thiesse;L. Thompson;M. Malek;O. Stone;H. Okazawa;S. B. Kim-S. B.-Kim-2109632697;I. Yu;K. Nishijima;M. Koshiba;N. Ogawa;K. Iwamoto;M. Yokoyama;K. Martens;M. Vagins;M. Kuze;S. Izumiyama;M. Tanaka;T. Yoshida;M. Inomoto;M. Ishitsuka;R. Matsumoto;K. Ohta;M. Shinoki;J. F. Martin-J. F.-Martin-2110018099;H. A. Tanaka-H. A.-Tanaka-1390470446;T. Towstego;M. Hartz;A. Konaka;P. de Perio;N. Prouse;B. Pointon;S. Chen;B. D. Xu-B. D.-Xu-2258291899;B. Richards;B. Jamieson;J. Walker;A. Minamino;G. Pintaudi;R. Sasaki
中子-反中子振荡（$n\to\bar n$）作为一个$\Delta B=2$的重子数破坏过程，是检验重子数守恒的唯一方法。我们已经进行了搜索$n\to\bar n$振荡与束缚中子在超级神冈，从它的前四个运行周期的完整数据集，代表了0.37吨-年的曝光。该搜索使用了一个多变量分析，对模拟的n到n事件和大气中微子背景进行了训练，得到了11个候选事件，预期背景为9.3个事件。在不存在统计上显著的过剩的情况下，我们导出了在90% C. L.下，$^{16}$O核的$n出现寿命的下限为3.610 ^{32}$年，中子-反中子振荡时间的下限为$n> 4.710 ^{8}$s.
As a baryon number violating process with $\Delta B=2$, neutron-antineutron oscillation ($n\to\bar n$) provides a unique test of baryon number conservation. We have performed a search for $n\to\bar n$ oscillation with bound neutrons in Super-Kamiokande, with the full data set from its first four run periods, representing an exposure of 0.37~Mton-years. The search used a multivariate analysis trained on simulated $n\to\bar n$ 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 $\bar n$ appearance lifetime in $^{16}$O nuclei of $3.6\times{10}^{32}$ years and on the neutron-antineutron oscillation time of $\tau_{n\to\bar n} > 4.7\times10^{8}$~s at 90\% C.L..