Updated T2K measurements of muon neutrino and antineutrino disappearance using <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>3.6</mml:mn><mml:mo>×</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mn>10</mml:mn></mml:mrow><mml:mrow><mml:mn>21</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:mrow></mml:math> protons on target
K. Abe, N. Akhlaq, R. Akutsu, A. Ali, S. Alonso Monsalve, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Yosuke Ashida, E. T. Atkin, M. Barbi, Gareth J. Barker, G. Barr, D. Barrow, M. Batkiewicz, F. Bench, V. Berardi, L. Berns, S. Bhadra, Adrien Blanchet, A. Blondel, S. Bolognesi, T. Bonus, S. Bordoni, S. Boyd, A. Bravar, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, J. A. Caballero, N. F. Calabria, S. Cao, D Carabadjac, A. J. Carter, S. L. Cartwright, M. P. Casado, M. G. Catanesi, A. Cervera, J. Chakrani, D. Cherdack, P. S. Chong, G. Christodoulou, A. Chvirova, M. Cicerchia, J. P. Coleman, G. Collazuol, L. Cook, A. Cudd, C. Dalmazzone, T. Daret, Yu. I. Davydov, A. De Roeck, G. De Rosa, T. Dealtry, Claudia Caterina 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, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M Feltre, A.J. Finch, G. A. Fiorentini Aguirre, G. Fiorillo, M. D. Fitton, J. M. Franco-Patino, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, K. Fusshoeller, L. Giannessi, C. Giganti, V. Glagolev, M. Gonin, J. Gonzalez-Rosa, E. A. G. Goodman, A. Gorin, M. Grassi, M. Guigue, D. R. Hadley, Jennifer Haigh, P. Hamacher-Baumann, D. A. Harris
Abstract
Muon neutrino and antineutrino disappearance probabilities are identical in the standard three-flavor neutrino oscillation framework, but $CPT$ violation and nonstandard interactions can violate this symmetry. In this work we report the measurements of ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{23}$ and $\mathrm{\ensuremath{\Delta}}{m}_{32}^{2}$ independently for neutrinos and antineutrinos. The aforementioned symmetry violation would manifest as an inconsistency in the neutrino and antineutrino oscillation parameters. The analysis discussed here uses a total of $1.97\ifmmode\times\else\texttimes\fi{}{10}^{21}$ and $1.63\ifmmode\times\else\texttimes\fi{}{10}^{21}$ protons on target taken with a neutrino and antineutrino beam respectively, and benefits from improved flux and cross section models, new near-detector samples and more than double the data reducing the overall uncertainty of the result. No significant deviation is observed, consistent with the standard neutrino oscillation picture.