학술논문
Measurements of neutrino oscillation parameters from the T2K experiment using 3.6×1021 protons on target
Document Type
Original Paper
Author
Abe, K.; Akhlaq, N.; Akutsu, R.; Ali, A.; Alonso Monsalve, S.; Alt, C.; Andreopoulos, C.; Antonova, M.; Aoki, S.; Arihara, T.; Asada, Y.; Ashida, Y.; Atkin, E. T.; Barbi, M.; Barker, G. J.; Barr, G.; Barrow, D.; Batkiewicz-Kwasniak, M.; Bench, F.; Berardi, V.; Berns, L.; Bhadra, S.; Blanchet, A.; Blondel, A.; Bolognesi, S.; Bonus, T.; Bordoni, S.; Boyd, S. B.; Bravar, A.; Bronner, C.; Bron, S.; Bubak, A.; Buizza Avanzini, M.; Caballero, J. A.; Calabria, N. F.; Cao, S.; Carabadjac, D.; Carter, A. J.; Cartwright, S. L.; Catanesi, M. G.; Cervera, A.; Chakrani, J.; Cherdack, D.; Chong, P. S.; Christodoulou, G.; Chvirova, A.; Cicerchia, M.; Coleman, J.; Collazuol, G.; Cook, L.; Cudd, A.; Dalmazzone, C.; Daret, T.; Davydov, Yu. I.; De Roeck, A.; De Rosa, G.; Dealtry, T.; Delogu, C. C.; Densham, C.; Dergacheva, A.; Di Lodovico, F.; Dolan, S.; Douqa, D.; Doyle, T. A.; Drapier, O.; Dumarchez, J.; Dunne, P.; Dygnarowicz, K.; Eguchi, A.; Emery-Schrenk, S.; Erofeev, G.; Ershova, A.; Eurin, G.; Fedorova, D.; Fedotov, S.; Feltre, M.; Finch, A. J.; Fiorentini Aguirre, G. A.; Fiorillo, G.; Fitton, M. D.; Franco Patiño, J. M.; Friend, M.; Fujii, Y.; Fukuda, Y.; Fusshoeller, K.; Giannessi, L.; Giganti, C.; Glagolev, V.; Gonin, M.; González Rosa, J.; Goodman, E. A. G.; Gorin, A.; Grassi, M.; Guigue, M.; Hadley, D. R.; Haigh, J. T.; Hamacher-Baumann, P.; Harris, D. A.; Hartz, M.; Hasegawa, T.; Hassani, S.; Hastings, N. C.; Hayato, Y.; Henaff, D.; Hiramoto, A.; Hogan, M.; Holeczek, J.; Holin, A.; Holvey, T.; Hong Van, N. T.; Honjo, T.; Iacob, F.; Ichikawa, A. K.; Ikeda, M.; Ishida, T.; Ishitsuka, M.; Israel, H. T.; Iwamoto, K.; Izmaylov, A.; Izumi, N.; Jakkapu, M.; Jamieson, B.; Jenkins, S. J.; Jesús-Valls, C.; Jiang, J. J.; Jonsson, P.; Joshi, S.; Jung, C. K.; Jurj, P. B.; Kabirnezhad, M.; Kaboth, A. C.; Kajita, T.; Kakuno, H.; Kameda, J.; Kasetti, S. P.; Kataoka, Y.; Katayama, Y.; Katori, T.; Kawaue, M.; Kearns, E.; Khabibullin, M.; Khotjantsev, A.; Kikawa, T.; Kikutani, H.; King, S.; Kiseeva, V.; Kisiel, J.; Kobata, T.; Kobayashi, H.; Kobayashi, T.; Koch, L.; Kodama, S.; Konaka, A.; Kormos, L. L.; Koshio, Y.; Kostin, A.; Koto, T.; Kowalik, K.; Kudenko, Y.; Kudo, Y.; Kuribayashi, S.; Kurjata, R.; Kutter, T.; Kuze, M.; La Commara, M.; Labarga, L.; Lachner, K.; Lagoda, J.; Lakshmi, S. M.; Lamers James, M.; Lamoureux, M.; Langella, A.; Laporte, J.-F.; Last, D.; Latham, N.; Laveder, M.; Lavitola, L.; Lawe, M.; Lee, Y.; Lin, C.; Lin, S.-K.; Litchfield, R. P.; Liu, S. L.; Li, W.; Longhin, A.; Long, K. R.; Lopez Moreno, A.; Ludovici, L.; Lu, X.; Lux, T.; Machado, L. N.; Magaletti, L.; Mahn, K.; Malek, M.; Mandal, M.; Manly, S.; Marino, A. D.; Marti-Magro, L.; Martin, D. G. R.; Martini, M.; Martin, J. F.; Maruyama, T.; Matsubara, T.; Matveev, V.; Mauger, C.; Mavrokoridis, K.; Mazzucato, E.; McCauley, N.; McElwee, J.; McFarland, K. S.; McGrew, C.; McKean, J.; Mefodiev, A.; Megias, G. D.; Mehta, P.; Mellet, L.; Metelko, C.; Mezzetto, M.; Miller, E.; Minamino, A.; Mineev, O.; Mine, S.; Miura, M.; Molina Bueno, L.; Moriyama, S.; Moriyama, S.; Morrison, P.; Mueller, Th. A.; Munford, D.; Munteanu, L.; Nagai, K.; Nagai, Y.; Nakadaira, T.; Nakagiri, K.; Nakahata, M.; Nakajima, Y.; Nakamura, A.; Nakamura, H.; Nakamura, K.; Nakamura, K. D.; Nakano, Y.; Nakayama, S.; Nakaya, T.; Nakayoshi, K.; Naseby, C. E. R.; Ngoc, T. V.; Nguyen, V. Q.; Niewczas, K.; Nishimori, S.; Nishimura, Y.; Nishizaki, K.; Nosek, T.; Nova, F.; Novella, P.; Nugent, J. C.; O’Keeffe, H. M.; O’Sullivan, L.; Odagawa, T.; Ogawa, T.; Okada, R.; Okinaga, W.; Okumura, K.; Okusawa, T.; Ospina, N.; Owen, R. A.; Oyama, Y.; Palladino, V.; Paolone, V.; Pari, M.; Parlone, J.; Parsa, S.; Pasternak, J.; Pavin, M.; Payne, D.; Penn, G. C.; Pershey, D.; Pickering, L.; Pidcott, C.; Pintaudi, G.; Pistillo, C.; Popov, B.; Porwit, K.; Posiadala-Zezula, M.; Prabhu, Y. S.; Pupilli, F.; Quilain, B.; Radermacher, T.; Radicioni, E.; Radics, B.; Ramírez, M. A.; Ratoff, P. N.; Reh, M.; Riccio, C.; Rondio, E.; Roth, S.; Roy, N.; Rubbia, A.; Ruggeri, A. C.; Ruggles, C. A.; Rychter, A.; Sakashita, K.; Sánchez, F.; Santucci, G.; Schloesser, C. M.; Scholberg, K.; Scott, M.; Seiya, Y.; Sekiguchi, T.; Sekiya, H.; Sgalaberna, D.; Shaikhiev, A.; Shaker, F.; Shaykina, A.; Shiozawa, M.; Shorrock, W.; Shvartsman, A.; Skrobova, N.; Skwarczynski, K.; Smyczek, D.; Smy, M.; Sobczyk, J. T.; Sobel, H.; Soler, F. J. P.; Sonoda, Y.; Speers, A. J.; Spina, R.; Suslov, I. A.; Suvorov, S.; Suzuki, A.; Suzuki, S. Y.; Suzuki, Y.; Sztuc, A. A.; Tada, M.; Tairafune, S.; Takayasu, S.; Takeda, A.; Takeuchi, Y.; Takifuji, K.; Tanaka, H. K.; Tanihara, Y.; Tani, M.; Teklu, A.; Tereshchenko, V. V.; Teshima, N.; Thamm, N.; Thompson, L. F.; Toki, W.; Touramanis, C.; Towstego, T.; Tsui, K. M.; Tsukamoto, T.; Tzanov, M.; Uchida, Y.; Vagins, M.; Vargas, D.; Varghese, M.; Vasseur, G.; Vilela, C.; Villa, E.; Vinning, W. G. S.; Virginet, U.; Vladisavljevic, T.; Wachala, T.; Walsh, J. G.; Wang, Y.; Wan, L.; Wark, D.; Wascko, M. O.; Weber, A.; Wendell, R.; Wilking, M. J.; Wilkinson, C.; Wilson, J. R.; Wood, K.; Wret, C.; Xia, J.; Xu, Y.-H.; Yamamoto, K.; Yamamoto, T.; Yanagisawa, C.; Yang, G.; Yano, T.; Yasutome, K.; Yershov, N.; Yevarouskaya, U.; Yokoyama, M.; Yoshimoto, Y.; Yoshimura, N.; Yu, M.; Zaki, R.; Zalewska, A.; Zalipska, J.; Zaremba, K.; Zarnecki, G.; Zhao, X.; Zhu, T.; Ziembicki, M.; Zimmerman, E. D.; Zito, M.; Zsoldos, S.
Source
The European Physical Journal C: Particles and Fields. 83(9)
Subject
Language
English
ISSN
1434-6052
Abstract
The T2K experiment presents new measurements of neutrino oscillation parameters using 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, POT neutrino data was collected at the FD. Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data. Additionally, this is the first T2K oscillation analysis to use NA61/SHINE data on a replica of the T2K target to tune the neutrino flux model, and the neutrino interaction model was improved to include new nuclear effects and calculations. Frequentist and Bayesian analyses are presented, including results on 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, and the impact of priors on the 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, measurement. Both analyses prefer the normal mass ordering and upper octant of 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, from reactors, 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, using Feldman–Cousins corrected intervals, and 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, using constant 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, intervals. The CP-violating phase is constrained to 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, using Feldman–Cousins corrected intervals, and 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, credible level using a flat prior in 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, and just below 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, using a flat prior in 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, When the external constraint on 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, is removed, 19.7(16.3)×10204.7×1020sin2θ13δCPsin2θ23sin2θ13sin2θ23=0.561-0.032+0.021Δm322=2.494-0.058+0.041×10-3eV2Δχ2δCP=-1.97-0.70+0.97δCP=0,π2σδCP,2σsinδCP.sin2θ13sin2θ13=28.0-6.5+2.8×10-3, in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.