Joint neutrino oscillation analysis from the T2K and NOvA experiments

The landmark discovery that neutrinos have mass and can change type (or flavour) as they propagate-a process called neutrino oscillation<sup>1-6</sup>-has opened up a rich array of theoretical and experimental questions being actively pursued today. Neutrino oscillation remains the most powerful experimental tool for addressing many of these questions, including whether neutrinos violate charge-parity (CP) symmetry, which has possible connections to the unexplained preponderance of matter over antimatter in the Universe<sup>7-11</sup>. Oscillation measurements also probe the mass-squared differences between the different neutrino mass states (Δm<sup>2</sup>), whether there are two light states and a heavier one (normal ordering) or vice versa (inverted ordering), and the structure of neutrino mass and flavour mixing<sup>12</sup>. Here we carry out the first joint analysis of datasets from NOvA<sup>13</sup> and T2K<sup>14</sup>, the two currently operating long-baseline neutrino oscillation experiments (hundreds of kilometres of neutrino travel distance), taking advantage of our complementary experimental designs and setting new constraints on several neutrino sector parameters. This analysis provides new precision on the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Δ</mml:mi> <mml:msubsup><mml:mrow><mml:mi>m</mml:mi></mml:mrow> <mml:mrow><mml:mn>32</mml:mn></mml:mrow> <mml:mrow><mml:mn>2</mml:mn></mml:mrow> </mml:msubsup> </mml:mrow> </mml:math> mass difference, finding <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2.4</mml:mn> <mml:msubsup><mml:mrow><mml:mn>3</mml:mn></mml:mrow> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>0.03</mml:mn></mml:mrow> <mml:mrow><mml:mo>+</mml:mo> <mml:mn>0.04</mml:mn></mml:mrow> </mml:msubsup> <mml:mo>×</mml:mo> <mml:mn>1</mml:mn> <mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>3</mml:mn></mml:mrow> </mml:msup> <mml:mspace></mml:mspace> <mml:msup><mml:mrow><mml:mi>eV</mml:mi></mml:mrow> <mml:mrow><mml:mn>2</mml:mn></mml:mrow> </mml:msup> </mml:mrow> </mml:math> in the normal ordering and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>-</mml:mo> <mml:mn>2.4</mml:mn> <mml:msubsup><mml:mrow><mml:mn>8</mml:mn></mml:mrow> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>0.04</mml:mn></mml:mrow> <mml:mrow><mml:mo>+</mml:mo> <mml:mn>0.03</mml:mn></mml:mrow> </mml:msubsup> <mml:mo>×</mml:mo> <mml:mn>1</mml:mn> <mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>3</mml:mn></mml:mrow> </mml:msup> <mml:mspace></mml:mspace> <mml:msup><mml:mrow><mml:mi>eV</mml:mi></mml:mrow> <mml:mrow><mml:mn>2</mml:mn></mml:mrow> </mml:msup> </mml:mrow> </mml:math> in the inverted ordering, as well as a 3σ interval on δ<sub>CP</sub> of [-1.38π, 0.30π] in the normal ordering and [-0.92π, -0.04π] in the inverted ordering. The data show no strong preference for either mass ordering, but notably, if inverted ordering were assumed true within the three-flavour mixing model, then our results would provide evidence of CP symmetry violation in the lepton sector.

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Nature
Published
2025-10-22
DOI
https://doi.org/10.1038/s41586-025-09599-3
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7
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Neutrino Physics Research
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article
Field-Weighted Citation Impact
13.09

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article

Joint neutrino oscillation analysis from the T2K and NOvA experiments

S. Nelleri, R. Nichol, Yuta Kawamura, S.C. Joshi et al.
7 citations
Nature
Neutrino Physics Research
13.09
article

Joint neutrino oscillation analysis from the T2K and NOvA experiments

S. Nelleri, R. Nichol, Yuta Kawamura, S.C. Joshi, B. Jargowsky, E. C. Dukes, Lucile Mellet, T. Holvey, A. Habig, V. Mikola, S. Levorato, V. Kus, M. R. Vagins, Robert J. Harris, N. Kishore Babu, H. Meyer, N. Tran, M. Lawe, Prokar Dasgupta, Adrien Blanchet, Xingyu Zhao, D. Whittington, N. Balashov, M. L. Marshak, J. M. Carceller, S. Abubakar, A. Rychter, A. Yankelevich, D. Martin, M. MacMahon, S. Calvez, Ryuji Okazaki, T. Lackey, N. Buchanan, Rajat Banerjee, P. F. Derwent, S. Shukla, S. Lewis, Anne Chalumeau, N. Talukdar, Carl Maria von Weber, R. Kurjata, D. Douqa, D. Fedorova, N. Yershov, M. Kabirnezhad, R. Kralik, M. Martini, D. Last, Y. Takeuchi, Dinesh Kumar Singha, R. Ehrlich, L. Koch, Y. Hayato, R. Bowles, Daisuke Wakabayashi, V. Berardi, L. Kneale, A. Moren, John B. Kisiel, M. Rajaoalisoa, A. Olshevskiy, T. Kutter, Kendall Mahn, J. P. McKean, C. D. Kuruppu, P. Govindaraj, H. Zhong, M. Batkiewicz, C. Touramanis, K. Nakagiri, T. Nosek, T. Arihara, A. Antoshkin, A. Morozova, K. S. McFarland, Takashi Honjo, L. W. Koerner, C. McGrew, M. Feltre, Th. A. Mueller, E. Rondio, S. R. Mishra, E. A. G. Goodman, V. Singh, J. Trokan-Tenorio, P. Snopok, P. Adamson, Michael S. Titus, K. Nakamura, G. Eurin, C. Sweeney, T. K. Warburton, Z. Djurcic, T. Contreras, Y. Ashida, J. E. Elias, A. Rafique, Y. Nagai, P. Singh, James A. Lock, N. Skrobova, L. Kolupaeva, J. F. Laporte, A. Pal, N. Jachowicz, K. Heller, T. J. Carroll, N Latham, K. Soustružnı́k, I. A. Suslov, A. Sousa, A. Kalitkina, R. Mohanta, David Langridge, R. Matsumoto, K. Niewczas, M. C. Goodman, M. O. Wascko, A. Sheshukov, A. C. Booth, R. P. Litchfield, Kerry Dobbs, R. Akutsu, L. Cremonesi, J. A. Caballero, J. T. Sobczyk, T. Thakore, Y. Oyama, M. T. Manoharan, J. Walsh, J. Urheim, M. J. Frank, T. Nakadaira, I. Singh, T. Sekiya, O. Samoylov, S. Roth, C. L. Davis, A. Yahaya, B. Brahma, P. N. Ratoff, Paul Bates, S. Arimoto, B. S. Acharya, R. González-Jiménez, A. Aurisano, D. Henaff, I. Kakorin, P. Sharma, M. Martinez-Casales, P. Tas, D. Ferlewicz, S. Sánchez Falero, A. Klustová, L. R. Prais, Jun Hu, P. Morrison, A.J. Finch, K. Hosokawa, Deborah A. Harris, L. Panda, C. M. Schloesser, L. Mualem, D. A. Wickremasinghe, T. E. Coan, S. Magill, F. Cadoux, Elias Robles, A. Holin, Julie Y. Ji, B. Ramson, S. Han, R. C. Group, M. D. Messier, L. Munteanu, B. Rebel, L. Wan, D. Dueñas Tonguino, A. Bubak, Doan Trang Nguyen, M. Muether, Taiyu Zhu, F. Pupilli, W. A. Mann, P. Dunne, G. Zarnecki, A. Barros, H. M. O’Keeffe, A. A. Sztuc, R. Chirco, L. N. Machado, D. Naples, V. Bhatnagar, V. Raj, Nobuhiko Onda, A. Christensen, V. Hewes, S. Bolognesi, J. Kleykamp, S. Karpova, Y. Kudenko, E. Radicioni, Z. Vallari, M. Dolce, W. Saenz, M. A. Ramírez, Tim Peacock, J. Lesmeister, S. Cap, T. Yano, K. Skwarczynski, C. Forza, B. Popov, E. Villa, Erin Ewart, L. Bathe-Peters, S. Abe, P. Roy, M. Ishitsuka, T. Katori, L. Asquith, T. Hasegawa, D. Coveyou, B. Bhuyan, Alfonso Muñoz, Tokonatsu Yamamoto, Y. Torun, Yuji Noguchi, Michael Pfaff, A. Ivanova, Y. Nakano, Nagamitsu Yoshimura, Joshua Porter, C. Riccio, N. Solomey, K. Dygnarowicz, T. A. Doyle, P. T. Quyen, Mustafa Ozkaynak, P. Lasorak, S. Miki, L. Giannessi, E. Catano-Mur, Tyler Horoho, Y. Xiao, A. Norman, T. Ishida, M. A. Acero, L. L. Kormos, H. Gallagher, Greg Pawloski, V. Kurochka, H. Tanigawa, C. Giganti, O. Klimov, B. Yaeggy, T. Dealtry, W. Wu, Y. Furui, A. Giri, T. Tsukamoto, K. Yonehara, N. F. Calabria, S. B. Boyd, A. Dye, C. Dalmazzone, Y. Kudo, Yoshiki J. Sato, S. King, M. He, Mário Lachat, D. Cherdack, K. Gorshanov, J. Lagoda, А. Н. Шмаков, T. Nakaya, Gareth J. Barker, Bindu A. Bambah, K. Scholberg, A. Sutton, Н. Анфимов, G. D. Megias, G. S. Davies, D. D’Ago, A. Khanam, R. Bernstein, S. Cao, D. Leon Silverio, A. Zalewska, P. Vahle, E. Kearns, A. Weber, A. Konaka, C. K. Jung, B. Mehta, Christopher Densham, Jingkai Xia, N. Thamm, E. W. Miller, J. Zalipska, E. T. Atkin, S. Manly, D. Riley, M. C. Sánchez, U. Yevarouskaya, J. P. Cesar, X.-G. Lu, Y. Shiraishi, S. M. Lakshmi, P de Perio, Hari Prasad, Pierre Baldi, A. V. Waldron, K. Lang, A. Izmaylov, A. Norrick, E. Arrieta-Diaz, G. Erofeev, J. García-Marcos, W. Okinaga, N. Baudis, K. J. Vockerodt, A. Cooleybeck, M. C. F. Hooft, Burcu Kirezli, I. Heitkamp, K. A. Apte, V. S. Kasturi, J. Mirabito, H. Alarakia-Charles, Y. I. Alj Hakim, M. Kolupanova, L. Osu, A. J. Portocarrero Yrey, Y. Stroke, A. Kumar, H. Kakuno, Y. F. Yang, E. Tiras, A. K. Ichikawa, T. Miao, A. D. Marino, C. Jesús-Valls, A. Eguchi, W. Mu, A. Langella, L. Magaletti, H. Zheng, Botao Li, C. Wret, M. Ziembicki, S. Bhattacharjee, A. Lister, V. A. Baranov, Daniel Tran, A. Ershova, K. Abe, W. Shorrock, S. L. Liu, Daniel L. Barrow, H. T. Wallace, T. Olson, U. Virginet, G. Collazuol, S. J. Jenkins, R. B. Patterson, N. Ospina, F. Di Lodovico, Meng Jia, G. Anthony Reina, M. Yokoyama, E. Sandford, T. Lux, M. D. Fitton, V.V. Tereshchenko, A. Smith, Armando Lopes Moreno, K. Mavrokoridis, R. A. Gomes, K. Ieki, Y. S. Prabhu, R. Plunkett, H. Sekiya, M. Zito, S. Y. Suzuki, C. Mauger, S. Mine, N. McCauley, K. Lachner, L Ludovici, A. Chvirova, A. Dergacheva, V.V. Tereshchenko, V.Q Nguyen, O. Mineev, L. O’Sullivan, D. Carabadjac, Y. Yoshimoto, V. Kiseeva, T. Vladisavljevic, T. Wachala, A. Shvartsman, A. J. Speers, M. Guigue, A. C. Germer, K. Kowalik, D. Payne, D. Sgalaberna, D. Smyczek, P. Jonsson, A. Blondel, M. Shiozawa, W. Li, P. F. Ding, L. Pickering, J. Hartnell, J. Wolcott, M. Lamers James, J. P. Coleman, A. Mefodiev, N. T. Hong Van, M. Khabibullin, M. Tada, V. Paolone, S. Fedotov, S. L. Cartwright, Flynn Guo, J. Holeczek, J. Dumarchez, K. Nakayoshi, Y. Fujii, Y. Uchida, L. Labarga, S. Moriyama, C. Yanagisawa, M. Scott, M. Ikeda, S. Dolan, S. Emery-Schrenk, K. Okumura, D. M. Kaplan, M. Posiadała-Zezula, M. Wetstein, L. Russo, Thomas Peter Jones, A. Rubbia, T. Nakaya, A. Suzuki, B. Radics, M. Laveder, R. Wendell, Y. Nakajima, A. Butkevich, E. F. Bannister, B. C. Choudhary, O. Drapier, S. Nakayama, G. Vasseur, V. Glagolev, K. Bays, J. Zhang, Lluisa Maria Mir Martinez, Y. Kataoka, K. Yamamoto, C. Lin, V. Matveev, M. Gonin, J. Bian, C. Bronner, D. Wark, N. C. Hastings, L. Feng, M. Tzanov, J. Smolík, J. M. Hays, R. Zwaska, S. S. Chhibra, A. C. Kaboth, J. Pasternak, T. Sekiguchi, M. Strait, G. De Rosa, M. Friend, L. Berns, Y. Koshio, B. Quilain, Ciaran Hasnip, M. F. Cicala, R. Zaki, A. Longhin, M. Wallbank, Marco Grassi, R. Spina, E. D. Zimmerman, Y. Seiya, A. Teklu, L. Lavitola, J. C. Nugent, F. Sánchez, J. Chakrani, T. Daret, J. González Rosa, D. Munford, A. Cudd, S. Han, S. Zadorozhnyy, A. Himmel, P. Filip, J. Kameda, A. Baty, T. J. C. Bezerra, C. Bromberg, M. Smy, C. Metelko, C. E. R. Naseby, S. Zsoldos, L. Anthony, K. Sakashita, I.I. Vasilyev, D. A. Martínez Caicedo, M. G. Catanesi, F. Nova, S Nishimori, S. Samani, Yu. I. Davydov, M. Manrique Plata, S. Aoki, M. Mezzetto, M. P. Casado, T. Arai, S. Tairafune, K. E. Duffy, S. Kodama, F. Hakl, G. Barr, Richard Ramsden, Robert Hatcher, M. Miura, N. Roy, T. Okusawa, K. Mulder, R. Petti, P. Shanahan, W. H. Miller, G. Lopez, C. Wilkinson, A. Khotjantsev, H. Sobel, K. Wood, A. Shaikhiev, M. Varghese, S. Alonso Monsalve, S. Bordoni, T. Matsubara, M. Mandal, S. K. Swain, Michael Wilking, D. MYERS, L. Suter, Daniela Azevedo, K. K. Mahtani, H. Oh, Y. Nishimura, E. Niner, J. Zalesak, H. Kobayashi, M. Reh, Y. Hino, M. Kawaue, J. K. Nelson, A. Takeda, H.O. Back, J. R. Wilson, T. Schefke, Jinzhi Liu, J. Thomas, S. Hassani, M. Buizza Avanzini, K. Choi, J. Paley, A. A. L. Craplet, Jing Jiang, M Girgus, P. M. M. Boistier, D. Seppala, H. Adhkary, Ajit M. Srivastava, Abhay K. Jha, F. Cormier
article en
7 citations

Abstract

The landmark discovery that neutrinos have mass and can change type (or flavour) as they propagate-a process called neutrino oscillation<sup>1-6</sup>-has opened up a rich array of theoretical and experimental questions being actively pursued today. Neutrino oscillation remains the most powerful experimental tool for addressing many of these questions, including whether neutrinos violate charge-parity (CP) symmetry, which has possible connections to the unexplained preponderance of matter over antimatter in the Universe<sup>7-11</sup>. Oscillation measurements also probe the mass-squared differences between the different neutrino mass states (Δm<sup>2</sup>), whether there are two light states and a heavier one (normal ordering) or vice versa (inverted ordering), and the structure of neutrino mass and flavour mixing<sup>12</sup>. Here we carry out the first joint analysis of datasets from NOvA<sup>13</sup> and T2K<sup>14</sup>, the two currently operating long-baseline neutrino oscillation experiments (hundreds of kilometres of neutrino travel distance), taking advantage of our complementary experimental designs and setting new constraints on several neutrino sector parameters. This analysis provides new precision on the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Δ</mml:mi> <mml:msubsup><mml:mrow><mml:mi>m</mml:mi></mml:mrow> <mml:mrow><mml:mn>32</mml:mn></mml:mrow> <mml:mrow><mml:mn>2</mml:mn></mml:mrow> </mml:msubsup> </mml:mrow> </mml:math> mass difference, finding <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2.4</mml:mn> <mml:msubsup><mml:mrow><mml:mn>3</mml:mn></mml:mrow> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>0.03</mml:mn></mml:mrow> <mml:mrow><mml:mo>+</mml:mo> <mml:mn>0.04</mml:mn></mml:mrow> </mml:msubsup> <mml:mo>×</mml:mo> <mml:mn>1</mml:mn> <mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>3</mml:mn></mml:mrow> </mml:msup> <mml:mspace></mml:mspace> <mml:msup><mml:mrow><mml:mi>eV</mml:mi></mml:mrow> <mml:mrow><mml:mn>2</mml:mn></mml:mrow> </mml:msup> </mml:mrow> </mml:math> in the normal ordering and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>-</mml:mo> <mml:mn>2.4</mml:mn> <mml:msubsup><mml:mrow><mml:mn>8</mml:mn></mml:mrow> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>0.04</mml:mn></mml:mrow> <mml:mrow><mml:mo>+</mml:mo> <mml:mn>0.03</mml:mn></mml:mrow> </mml:msubsup> <mml:mo>×</mml:mo> <mml:mn>1</mml:mn> <mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>3</mml:mn></mml:mrow> </mml:msup> <mml:mspace></mml:mspace> <mml:msup><mml:mrow><mml:mi>eV</mml:mi></mml:mrow> <mml:mrow><mml:mn>2</mml:mn></mml:mrow> </mml:msup> </mml:mrow> </mml:math> in the inverted ordering, as well as a 3σ interval on δ<sub>CP</sub> of [-1.38π, 0.30π] in the normal ordering and [-0.92π, -0.04π] in the inverted ordering. The data show no strong preference for either mass ordering, but notably, if inverted ordering were assumed true within the three-flavour mixing model, then our results would provide evidence of CP symmetry violation in the lepton sector.

NatureVol. 646(8086)
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