# Atmospheric Neutrino Oscillation Analysis With Improved Event Reconstruction in Super-Kamiokande IV **Authors:** Super-Kamiokande Collaboration: M. Jiang, K. Abe, C. Bronner, Y., Hayato, M. Ikeda, K. Iyogi, J. Kameda, Y. Kato, Y. Kishimoto, Ll. Marti, M., Miura, S. Moriyama, T. Mochizuki, M. Nakahata, Y. Nakajima, Y. Nakano, S., Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa,, Y. Sonoda, A. Takeda, A. Takenaka, H. Tanaka, T. Yano, R. Akutsu, T. Kajita,, Y. Nishimura, K. Okumura, R. Wang, J. Xia, L. Labarga, P. Fernandez, F. d. M., Blaszczyk, C. Kachulis, E. Kearns, J. L. Raaf, J. L. Stone, S. Sussman, S., Berkman, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, S. Mine, P., Weatherly, M. B. Smy, H. W. Sobel, V. Takhistov, K. S. Ganezer, J. Hill, J., Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, O., Drapier, M. Gonin, J. Imber, Th. A. Mueller, P. Paganini, T. Ishizuka, T., Nakamura, J. S. Jang, K. Choi, J. G. Learned, S. Matsuno, R. P. Litchfield,, A. A. Sztuc, Y. Uchida, M. O. Wascko, N. F. Calabria, M. G. Catanesi, R. A., Intonti, E. Radicioni, G. De Rosa, A. Ali, G. Collazuol, F. Iacob, L., Ludovici, S. Cao, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, T., Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto,, KE. Abe, M. Hasegawa, Y. Isobe, H. Miyabe, T. Sugimoto, A. T. Suzuki, Y., Takeuchi, Y. Ashida, T. Hayashino, S. Hirota, T. Kikawa, M. Mori, KE., Nakamura, T. Nakaya, R. A. Wendell, L. H. V. Anthony, N. McCauley, A., Pritchard, K. M. Tsui, Y. Fukuda, Y. Itow, M. Murrase, P. Mijakowski, K., Frankiewicz, C. K. Jung, X. Li, J. L. Palomino, G. Santucci, C. Vilela, M. J., Wilking, C. Yanagisawa, D. Fukuda, K. Hagiwara, H. Ishino, S. Ito, Y. Koshio,, M. Sakuda, Y. Takahira, C. Xu, Y. Kuno, C. Simpson, D. Wark, F. Di Lodovico,, B. Richards, S. Molina Sedgwick, R. Tacik, S. B. Kim, M. Thiesse, L., Thompson, H. Okazawa, Y. Choi, K. Nishijima, M. Koshiba, M. Yokoyama, A., Goldsack, K. Martens, M. Murdoch, B. Quilain, Y. Suzuki, M. R. Vagins, M., Kuze, Y. Okajima, T. Yoshida, M. Ishitsuka, J. F. Martin, C. M. Nantais, H., A. Tanaka, T. Towstego, M. Hartz, A. Konaka, P. de Perio, S. Chen, L. Wan, A., Minamino arXiv: 1901.03230 · 2019-12-06 ## TL;DR This paper presents an improved event reconstruction algorithm for Super-Kamiokande IV, enhancing neutrino detection and analysis, leading to a weak preference for the normal neutrino mass hierarchy based on 253.9 kton-year data. ## Contribution The paper introduces a new maximum likelihood-based reconstruction algorithm that improves event analysis and sensitivity to neutrino mass hierarchy in Super-Kamiokande IV. ## Key findings - Enhanced event reconstruction capabilities. - Increased sensitivity to neutrino mass hierarchy. - Weak preference for the normal hierarchy at 74% confidence. ## Abstract A new event reconstruction algorithm based on a maximum likelihood method has been developed for Super-Kamiokande. Its improved kinematic and particle identification capabilities enable the analysis of atmospheric neutrino data in a detector volume 32% larger than previous analyses and increases sensitivity to the neutrino mass hierarchy. Analysis of a 253.9 kton-year exposure of the Super-Kamiokande IV atmospheric neutrino data has yielded a weak preference for the normal hierarchy, disfavoring the inverted hierarchy at 74% assuming oscillations at the best fit of the analysis. ## Full text _Full body text omitted from this summary view._ Fetch the complete paper as Markdown: https://tomesphere.com/paper/1901.03230/full.md ## Figures 53 figures with captions in the complete paper: https://tomesphere.com/paper/1901.03230/full.md ## References 35 references — full list in the complete paper: https://tomesphere.com/paper/1901.03230/full.md --- Source: https://tomesphere.com/paper/1901.03230