Measurements of neutrino oscillation parameters from the T2K experiment using $$3.6\times 10^{21}$$ protons on target
The TK Collaboration,K. Abe,N. Akhlaq,R. Akutsu,A. Ali,S. Alonso Monsalve,C. Alt,C. Andreopoulos,M. Antonova,S. Aoki,T. Arihara,Y. Asada,Y. Ashida,E. T. Atkin,G. J. Barker,G. Barr,D. Barrow,M. Batkiewicz-Kwasniak,F. Bench,V. Berardi,L. Berns,S. Bhadra,A. Blanchet,A. Blondel,S. Bolognesi,T. Bonus,S. Bordoni,S. B. Boyd,A. Bravar,C. Bronner,S. Bron,A. Bubak,M. Buizza Avanzini,J. A. Caballero Carretero,S. Cao,A. J. Carter,S. L. Cartwright,M. G. Catanesi,A. Cervera,J. Chakrani,D. Cherdack,G. Christodoulou,M. Cicerchia,J. Coleman,G. Collazuol,L. Cook,A. Cudd,C. Dalmazzone,Yu. I. Davydov,A. De Roeck,G. De Rosa,T. Dealtry,C. C. Delogu,C. Densham,A. Dergacheva,F. Di Lodovico,S. Dolan,D. Douqa,T. A. Doyle,O. Drapier,J. Dumarchez,P. Dunne,K. Dygnarowicz,A. Eguchi,S. Emery-Schrenk,A. Ershova,M. Feltre,A. J. Finch,G. A. Fiorentini Aguirre,G. Fiorillo,J. M. Franco Patiño,M. Friend,Y. Fujii,Y. Fukuda,K. Fusshoeller,L. Giannessi,C. Giganti,V. Glagolev,M. Gonin,J. González Rosa,Elise Goodman,A. Gorin,M. Grassi,M. Guigue,D. R. Hadley,J. T. Haigh,P. Hamacher-Baumann,D. A. Harris,M. Hartz,T. Hasegawa,S. Hassani,N. C. Hastings,Y. Hayato,A. Hiramoto,M. Hogan,J. Holeczek,A. Holin,T. Holvey,N. T. Hong Van,T. Honjo,F. Iacob,A. K. Ichikawa,M. Ikeda,T. Ishida,M. Ishitsuka,H. T. Israel,K. Iwamoto,A. Izmaylov,N. Izumi,M. Jakkapu,B. Jamieson,S. J. Jenkins,C. Jesús-Valls,J. J. Jiang,P. Jonsson,C. K. Jung,P. B. Jurj,M. Kabirnezhad,A. C. Kaboth,T. Kajita,H. Kakuno,J. Kameda,S. P. Kasetti,Y. Kataoka,Y. Katayama,T. Katori,M. Kawaue,E. Kearns,M. Khabibullin,A. Khotjantsev,T. Kikawa,H. Kikutani,S. King,J. Kisiel,T. Kobata,T. Kobayashi,L. Koch,A. Konaka,L. L. Kormos,Y. Koshio,A. Kostin,K. Kowalik,Y. Kudenko,S. Kuribayashi,R. Kurjata,T. Kutter,M. Kuze,M. La Commara,L. Labarga,K. Lachner,J. Lagoda,S. M. Lakshmi,M. Lamers James,M. Lamoureux,A. Langella,D. Last,N. Latham,M. Laveder,L. Lavitola,M. Lawe,Y. Lee,C. Lin,S. -K. Lin,R. P. Litchfield,S. L. Liu,A. Longhin,K. R. Long,L. Ludovici,X. Lu,T. Lux,L. N. Machado,L. Magaletti,K. Mahn,M. Malek,M. Mandal,S. Manly,A. D. Marino,L. Marti-Magro,Dirk Martin,M. Martini,T. Maruyama,T. Matsubara,V. Matveev,C. Mauger,K. Mavrokoridis,E. Mazzucato,N. McCauley,J. McElwee,K. S. McFarland,C. McGrew,A. Mefodiev,G. D. Megias,L. Mellet,M. Mezzetto,A. Minamino,O. Mineev,S. Mine,M. Miura,L. Molina Bueno,S. Moriyama,T. Mueller,D. Munford,L. Munteanu,K. Nagai,Y. Nagai,T. Nakadaira,K. Nakagiri,M. Nakahata,Y. Nakajima,A. Nakamura,H. Nakamura,K. Nakamura,K. D. Nakamura,Y. Nakano,S. Nakayama,T. Nakaya,K. Nakayoshi,C. E. R. Naseby,T. V. Ngoc,V. Q. Nguyen,K. Niewczas,Y. Nishimura,K. Nishizaki,F. Nova,J. C. Nugent,H. M. O'Keeffe,L. O'Sullivan,T. Odagawa,T. Ogawa,R. Okada,K. Okumura,T. Okusawa,R. A. Owen,Y. Oyama,V. Palladino,V. Paolone,M. Pari,J. Parlone,S. Parsa,J. Pasternak,M. Pavin,D. Payne,G. C. Penn,D. Pershey,L. Pickering,C. Pidcott,G. Pintaudi,C. Pistillo,B. Popov,K. Porwit,M. Posiadala-Zezula,Y. S. Prabhu,F. Pupilli,B. Quilain,T. Radermacher,E. Radicioni,B. Radics,P. N. Ratoff,M. Reh,C. Riccio,E. Rondio,S. Roth,A. Rubbia,A. C. Ruggeri,C. A. Ruggles,A. Rychter,K. Sakashita,F. Sánchez,G. Santucci,C. M. Schloesser,K. Scholberg,M. Scott,Y. Seiya,T. Sekiguchi,H. Sekiya,D. Sgalaberna,A. Shaikhiev,A. Shaykina,M. Shiozawa,W. Shorrock,A. Shvartsman,K. Skwarczynski,D. Smyczek,M. Smy,J. T. Sobczyk,H. Sobel,F. J. P. Soler,Y. Sonoda,A. J. Speers,R. Spina,I. A. Suslov,S. Suvorov,A. Suzuki,S. Y. Suzuki,Y. Suzuki,A. A. Sztuc,M. Tada,S. Tairafune,S. Takayasu,A. Takeda,Y. Takeuchi,K. Takifuji,H. K. Tanaka,Y. Tanihara,M. Tani,A. Teklu,V. V. Tereshchenko,N. Teshima,N. Thamm,L. F. Thompson,W. Toki,C. Touramanis,T. Towstego,K. M. Tsui,T. Tsukamoto,M. Tzanov,Y. Uchida,M. Vagins,D. Vargas,G. Vasseur,C. Vilela,E. Villa,W. G. S. Vinning,U. Virginet,T. Vladisavljevic,T. Wachala,J. G. Walsh,Y. Wang,L. Wan,D. Wark,M. O. Wascko,A. Weber,R. Wendell,M. J. Wilking,C. Wilkinson,J. R. Wilson,K. Wood,C. Wret,J. Xia,Y. -h. Xu,K. Yamamoto,C. Yanagisawa,G. Yang,T. Yano,K. Yasutome,N. Yershov,U. Yevarouskaya,M. Yokoyama,Y. Yoshimoto,M. Yu,R. Zaki,A. Zalewska,J. Zalipska,K. Zaremba,G. Zarnecki,X. Zhao,T. Zhu,M. Ziembicki,E. D. Zimmerman,M. Zito,S. Zsoldos
The European Physical Journal C(2023)
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摘要
Abstract The T2K experiment presents new measurements of neutrino oscillation parameters using $$19.7(16.3)\times 10^{20}$$ 19.7(16.3)×1020 protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional $$4.7\times 10^{20}$$ 4.7×1020 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 $$\sin ^2\theta _{13}$$ sin2θ13 and the impact of priors on the $$\delta _{\textrm{CP}}$$ δCP measurement. Both analyses prefer the normal mass ordering and upper octant of $$\sin ^2\theta _{23}$$ sin2θ23 with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on $$\sin ^2\theta _{13}$$ sin2θ13 from reactors, $$\sin ^2\theta _{23}=0.561^{+0.021}_{-0.032}$$ sin2θ23=0.561-0.032+0.021 using Feldman–Cousins corrected intervals, and $$\varDelta {}m^2_{32}=2.494_{-0.058}^{+0.041}\times 10^{-3}~\text {eV}^2$$ Δm322=2.494-0.058+0.041×10-3eV2 using constant $$\varDelta \chi ^{2}$$ Δχ2 intervals. The CP-violating phase is constrained to $$\delta _{\textrm{CP}}=-1.97_{-0.70}^{+0.97}$$ δCP=-1.97-0.70+0.97 using Feldman–Cousins corrected intervals, and $$\delta _{\textrm{CP}}=0,\pi $$ δCP=0,π is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than $$2\sigma $$ 2σ credible level using a flat prior in $$\delta _{\textrm{CP}},$$ δCP, and just below $$2\sigma $$ 2σ using a flat prior in $$\sin \delta _{\textrm{CP}}.$$ sinδCP. When the external constraint on $$\sin ^2\theta _{13}$$ sin2θ13 is removed, $$\sin ^2\theta _{13}=28.0^{+2.8}_{-6.5}\times 10^{-3},$$ sin2θ13=28.0-6.5+2.8×10-3, in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.