arXiv 1410.20082014-10hep-exhep-ph

Super-Kamiokande中利用大气中微子进行无菌中微子混合的极限

Limits on sterile neutrino mixing using atmospheric neutrinos in Super-Kamiokande

Kamiokande Collaboration, K. Abe, Y. Haga, Y. Hayato, M. Ikeda, K. Iyogi, J. Kameda, Y. Kishimoto, M. Miura, S. Moriyama, M. Nakahata, Y. Nakano, S. Nakayama, H… 展开作者

Kamiokande Collaboration, K. Abe, Y. Haga, Y. Hayato, M. Ikeda, K. Iyogi, J. Kameda, Y. Kishimoto, M. Miura, S. Moriyama, M. Nakahata, Y. Nakano, S. Nakayama, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, H. Tanaka, T. Tomura, K. Ueno, R. A. Wendell, T. Yokozawa, T. Irvine, T. Kajita, I. Kametani, K. Kaneyuki, K. P. Lee, T. McLachlan, Y. Nishimura, E. Richard, K. Okumura, L. Labarga, P. Fernandez, S. Berkman, H. A. Tanaka, S. Tobayama, J. Gustafson, E. Kearns, J. L. Raaf, J. L. Stone, L. R. Sulak, M. Goldhaber, G. Carminati, W. R. Kropp, S. Mine, P. Weatherly, A. Renshaw, M. B. Smy, H. W. Sobel, V. Takhistov, K. S. Ganezer, B. L. Hartfiel, J. Hill, W. E. Keig, N. Hong, J. Y. Kim, I. T. Lim, T. Akiri, A. Himmel, K. Scholberg, C. W. Walter, T. Wongjirad, T. Ishizuka, S. Tasaka, J. S. Jang, J. G. Learned, S. Matsuno, S. N. Smith, T. Hasegawa, T. Ishida, T. Ishii, T. Kobayashi, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, A. T. Suzuki, Y. Takeuchi, C. Bronner, S. Hirota, K. Huang, K. Ieki, T. Kikawa, A. Minamino, A. Murakami, T. Nakaya, K. Suzuki, S. Takahashi, K. Tateishi, Y. Fukuda, K. Choi, Y. Itow, G. Mitsuka, P. Mijakowski, J. Hignight, J. Imber, C. K. Jung, C. Yanagisawa, H. Ishino, A. Kibayashi, Y. Koshio, T. Mori, M. Sakuda, R. Yamaguchi, T. Yano, Y. Kuno, R. Tacik, S. B. Kim, H. Okazawa, Y. Choi, K. Nishijima, M. Koshiba, Y. Suda, Y. Totsuka, M. Yokoyama, K. Martens, Ll. Marti, M. R. Vagins, J. F. Martin, P. de Perio, A. Konaka, M. J. Wilking, S. Chen, Y. Zhang, K. Connolly, R. J. Wilkes

备注：: 23 pages, 12 figures, PRD Editor's Suggestion
发表信息：: Phys. Rev. D 91, 052019 (2015)
DOI：: 10.1103/PhysRevD.91.052019

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摘要：

我们使用4,438天的超级神冈实验的大气中微子数据，提出了无菌中微子混合的限制。我们寻找快速振荡驱动的eV $^2$规模的质量分裂和振荡成不育中微子，而不是在大气质量分裂的τ中微子。当进行这两种搜索时，我们假设无菌质量分裂很大，允许$\sin^2(Δm^2 L/4E)$近似为$0.5$，并且我们假设电子中微子和无菌中微子（$|U_{e4}|^2 = 0$）之间没有混合。没有观察到无菌振荡的证据，我们将90% C. L下$Δm^2 > 0.8$ eV $^2$的$|U_{\mu4}|^2$限制为小于0.041，$|U_{\tau4}|^2$限制为小于0.18。在3+1的框架下。可以与大气中微子的近似，使这些限制可以很容易地应用到3+N模型，我们提供了一个通用的格式，让我们的结果与其他无菌中微子模型进行比较。

英文摘要：

We present limits on sterile neutrino mixing using 4,438 live-days of atmospheric neutrino data from the Super-Kamiokande experiment. We search for fast oscillations driven by an eV$^2$-scale mass splitting and for oscillations into sterile neutrinos instead of tau neutrinos at the atmospheric mass splitting. When performing both these searches we assume that the sterile mass splitting is large, allowing $\sin^2(Δm^2 L/4E)$ to be approximated as $0.5$, and we assume that there is no mixing between electron neutrinos and sterile neutrinos ($|U_{e4}|^2 = 0$). No evidence of sterile oscillations is seen and we limit $|U_{\mu4}|^2$ to less than 0.041 and $|U_{\tau4}|^2$ to less than 0.18 for $Δm^2 > 0.8$ eV$^2$ at the 90% C.L. in a 3+1 framework. The approximations that can be made with atmospheric neutrinos allow these limits to be easily applied to 3+N models, and we provide our results in a generic format to allow comparisons with other sterile neutrino models.

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