Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I–V
T. Wester, K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, Kenta Sato, H. Sekiya, Hayato Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernández, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, J. Bian, N. J. Griskevich, S. Locke, M. B. Smy, H. W. Sobel, Volodymyr Takhistov, A. Yankelevich, J. Hill, S.-H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, Pascal Paganini, B. Quilain, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, A. Langella, G. De Rosa, G. Collazuol, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa
Abstract
We present a measurement of neutrino oscillation parameters with the Super-Kamiokande detector using atmospheric neutrinos from the complete pure-water SK I–V (April 1996–July 2020) dataset, including events from an expanded fiducial volume. The dataset corresponds to 6511.3 live days and an exposure of 484.2 kiloton-years. Measurements of the neutrino oscillation parameters <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi mathvariant="normal">Δ</a:mi><a:msubsup><a:mi>m</a:mi><a:mrow><a:mn>3</a:mn><a:mn>2</a:mn></a:mrow><a:mn>2</a:mn></a:msubsup></a:math>, <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:msup><d:mi>sin</d:mi><d:mn>2</d:mn></d:msup><d:msub><d:mi>θ</d:mi><d:mrow><d:mn>2</d:mn><d:mn>3</d:mn></d:mrow></d:msub></d:math>, <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:msup><f:mi>sin</f:mi><f:mn>2</f:mn></f:msup><f:msub><f:mi>θ</f:mi><f:mrow><f:mn>1</f:mn><f:mn>3</f:mn></f:mrow></f:msub></f:math>, <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"><h:msub><h:mi>δ</h:mi><h:mi>CP</h:mi></h:msub></h:math>, and the preference for the neutrino mass ordering are presented with atmospheric neutrino data alone, and with constraints on <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"><j:msup><j:mi>sin</j:mi><j:mn>2</j:mn></j:msup><j:msub><j:mi>θ</j:mi><j:mrow><j:mn>1</j:mn><j:mn>3</j:mn></j:mrow></j:msub></j:math> from reactor neutrino experiments. Our analysis including constraints on <l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"><l:msup><l:mi>sin</l:mi><l:mn>2</l:mn></l:msup><l:msub><l:mi>θ</l:mi><l:mrow><l:mn>1</l:mn><l:mn>3</l:mn></l:mrow></l:msub></l:math> favors the normal mass ordering at the 92.3% level. Published by the American Physical Society 2024