T2K measurements of muon neutrino and antineutrino disappearance using 3.13×10^21 protons on target

Abe, K.; Akhlaq, N.; Akutsu, R.; Ali, A.; Alt, C.; Andreopoulos, C.; Antonova, M.; Aoki, S.; Arihara, T.; Asada, Y.; Ashida, Y.; Atkin, E. T.; Awataguchi, Y.; Barker, G. J.; Barr, G.; Barrow, D.; Batkiewicz-Kwasniak, M.; Beloshapkin, A.; Bench, F.; Berardi, V.; Berns, L.; Bhadra, S.; Blondel, A.; Bolognesi, S.; Bonus, T.; Bourguille, B.; Boyd, S. B.; Bravar, A.; Bravo Berguno, D.; Bronner, C.; Bron, S.; Bubak, A.; Buizza Avanzini, M.; Cao, S.; Cartwright, S. L.; Catanesi, M. G.; Cervera, A.; Cherdack, D.; Christodoulou, G.; Cicerchia, M.; Coleman, J.; Collazuol, G.; Cook, L.; Coplowe, D.; Cudd, A.; De Rosa, G.; Dealtry, T.; Delogu, C. C.; Dennis, S. R.; Densham, C.; Dergacheva, A.; Di Lodovico, F.; Dolan, S.; Doyle, T. A.; Dumarchez, J.; Dunne, P.; Eguchi, A.; Eklund, L.; Emery-Schrenk, S.; Ereditato, A.; Finch, A. J.; Fiorentini, G. A.; Francois, C.; Friend, M.; Fujii, Y.; Fukuda, R.; Fukuda, Y.; Fusshoeller, K.; Giganti, C.; Gonin, M.; Gorin, A.; Guigue, M.; Hadley, D. R.; Hamacher-Baumann, P.; Hartz, M.; Hasegawa, T.; Hassani, S.; Hastings, N. C.; Hayato, Y.; Hiramoto, A.; Hogan, M.; Holeczek, J.; Hong Van, N. T.; Honjo, T.; Iacob, F.; Ichikawa, A. K.; Ikeda, M.; Ishida, T.; Ishitsuka, M.; Iwamoto, K.; Izmaylov, A.; Izumi, N.; Jakkapu, M.; Jamieson, B.; Jenkins, S. J.; Jesus-Valls, C.; Jonsson, P.; Jung, C. K.; Jurj, P. B.; Kabirnezhad, M.; Kakuno, H.; Kameda, J.; Kasetti, S. P.; Kataoka, Y.; Katayama, Y.; Katori, T.; Kearns, E.; Khabibullin, M.; Khotjantsev, A.; Kikawa, T.; Kikutani, H.; King, S.; Kisiel, J.; Kobata, T.; Kobayashi, T.; Koch, L.; Konaka, A.; Kormos, L. L.; Koshio, Y.; Kostin, A.; Kowalik, K.; Kudenko, Y.; Kuribayashi, S.; Kurjata, R.; Kutter, T.; Kuze, M.; Labarga, L.; Lagoda, J.; Lamoureux, M.; Last, D.; Laveder, M.; Lawe, M.; Litchfield, R. P.; Liu, S. L.; Longhin, A.; Ludovici, L.; Lu, X.; Lux, T.; Machado, L. N.; Magaletti, L.; Mahn, K.; Malek, M.; Manly, S.; Maret, L.; Marino, A. D.; Marti-Magro, L.; Maruyama, T.; Matsubara, T.; Matsushita, K.; Mauger, C.; Mavrokoridis, K.; Mazzucato, E.; Mccauley, N.; Mcelwee, J.; Mcfarland, K. S.; Mcgrew, C.; Mefodiev, A.; Mezzetto, M.; Minamino, A.; Mineev, O.; Mine, S.; Miura, M.; Molina Bueno, L.; Moriyama, S.; Mueller, T. A.; Munteanu, L.; Nagai, Y.; Nakadaira, T.; Nakahata, M.; Nakajima, Y.; Nakamura, A.; Nakamura, K.; Nakano, Y.; Nakayama, S.; Nakaya, T.; Nakayoshi, K.; Naseby, C. E. R.; Ngoc, T. V.; Nguyen, V. Q.; Niewczas, K.; Nishimura, Y.; Noah, E.; Nonnenmacher, T. S.; Nova, F.; Nowak, J.; Nugent, J. C.; O'Keeffe, H. M.; O'Sullivan, L.; Odagawa, T.; Ogawa, T.; Okada, R.; Okumura, K.; Okusawa, T.; Owen, R. A.; Oyama, Y.; Palladino, V.; Paolone, V.; Pari, M.; Parker, W. C.; Parsa, S.; Pasternak, J.; Pavin, M.; Payne, D.; Penn, G. C.; Pickering, L.; Pidcott, C.; Pintaudi, G.; Pistillo, C.; Popov, B.; Porwit, K.; Posiadala-Zezula, M.; Pritchard, A.; Quilain, B.; Radermacher, T.; Radicioni, E.; Radics, B.; Ratoff, P. N.; Riccio, C.; Rondio, E.; Roth, S.; Rubbia, A.; Ruggeri, A. C.; Ruggles, C.; Rychter, A.; Sakashita, K.; Sanchez, F.; Santucci, G.; Schloesser, C. M.; Scholberg, K.; Scott, M.; Seiya, Y.; Sekiguchi, T.; Sekiya, H.; Sgalaberna, D.; Shaikhiev, A.; Shaykina, A.; Shiozawa, M.; Shorrock, W.; Shvartsman, A.; Skwarczynski, K.; Smy, M.; Sobczyk, J. T.; Sobel, H.; Soler, F. J. P.; Sonoda, Y.; Spina, R.; Suvorov, S.; Suzuki, A.; Suzuki, S. Y.; Suzuki, Y.; Sztuc, A. A.; Tada, M.; Tajima, M.; Takeda, A.; Takeuchi, Y.; Tanaka, H. K.; Tanihara, Y.; Tani, M.; Teshima, N.; Thompson, L. F.; Toki, W.; Touramanis, C.; Towstego, T.; Tsui, K. M.; Tsukamoto, T.; Tzanov, M.; Uchida, Y.; Vagins, M.; Valder, S.; Vargas, D.; Vasseur, G.; Vilela, C.; Vinning, W. G. S.; Vladisavljevic, T.; Wachala, T.; Walker, J.; Walsh, J. G.; Wang, Y.; Wark, D.; Wascko, M. O.; Weber, A.; Wendell, R.; Wilking, M. J.; Wilkinson, C.; Wilson, J. R.; Wood, K.; Wret, C.; Xia, J.; Yamamoto, K.; Yanagisawa, C.; Yang, G.; Yano, T.; Yasutome, K.; Yershov, N.; Yokoyama, M.; Yoshida, T.; Yu, M.; Zalewska, A.; Zalipska, J.; Zaremba, K.; Zarnecki, G.; Ziembicki, M.; Zito, M.; Zsoldos, S.

doi:10.1103/PhysRevD.103.L011101

We report measurements by the T2K experiment of the parameters θ23 and Δm322, which govern the disappearance of muon neutrinos and antineutrinos in the three-flavor PMNS neutrino oscillation model at T2K's neutrino energy and propagation distance. Utilizing the ability of the experiment to run with either a mainly neutrino or a mainly antineutrino beam, muon-like events from each beam mode are used to measure these parameters separately for neutrino and antineutrino oscillations. Data taken from 1.49×1021 protons on target (POT) in neutrino mode and 1.64×1021 POT in antineutrino mode are used. The best-fit values obtained by T2K were sin2(θ23)=0.51-0.07+0.06(0.43-0.05+0.21) and Δm322=2.47-0.09+0.08(2.50-0.13+0.18)×10-3 eV2/c4 for neutrinos (antineutrinos). No significant differences between the values of the parameters describing the disappearance of muon neutrinos and antineutrinos were observed. An analysis using an effective two-flavor neutrino oscillation model where the sine of the mixing angle is allowed to take nonphysical values larger than 1 is also performed to check the consistency of our data with the three-flavor model. Our data were found to be consistent with a physical value for the mixing angle.