The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of 19.7(16.3)×1020 protons on target in (anti)neutrino mode, the analysis finds a 1.9σ exclusion of CP conservation (defined as JCP=0) and a 1.2σ exclusion of the inverted mass ordering. Published by the American Physical Society 2025

We report an updated measurement of the $\nu_{\mu}$-induced, and the first measurement of the $\bar{\nu}_{\mu}$-induced coherent charged pion production cross section on $^{12}C$ nuclei in the T2K experiment. This is measured in a restricted region of the final-state phase space for which $p_{\mu,\pi}>0.2$ GeV, $\cos(\theta_{\mu})>0.8$ and $\cos(\theta_{\pi})>0.6$, and at a mean (anti)neutrino energy of 0.85 GeV using the T2K near detector. The measured $\nu_{\mu}$ CC coherent pion production flux-averaged cross section on $^{12}C$ is $(2.98 \pm 0.37 (stat.) \pm 0.31 (syst.) \substack{ +0.49 \\ -0.00 } \mathrm{ (Q^2\,model)}) \times 10^{-40}~\mathrm{cm}^{2}$. The new measurement of the $\bar{\nu}_{\mu}$-induced cross section on $^{12}{C}$ is $(3.05 \pm 0.71 (stat.) \pm 0.39 (syst.) \substack{ +0.74 \\ -0.00 } \mathrm{(Q^2\,model)}) \times 10^{-40}~\mathrm{cm}^{2}$. The results are compatible with both the NEUT 5.4.0 Berger-Sehgal (2009) and GENIE 2.8.0 Rein-Sehgal (2007) model predictions.

The T2K experiment presents new measurements of neutrino oscillation parameters using 19.7(16.3)× 10^20 protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional 4.7× 10^20 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 ^2θ _13 and the impact of priors on the δ _CP measurement. Both analyses prefer the normal mass ordering and upper octant of sin ^2θ _23 with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on sin ^2θ _13 from reactors, sin ^2θ _23=0.561^+0.021_-0.032 using Feldman–Cousins corrected intervals, and m^2_32=2.494_-0.058^+0.041× 10^-3 eV^2 using constant χ ^2 intervals. The CP-violating phase is constrained to δ _CP=-1.97_-0.70^+0.97 using Feldman–Cousins corrected intervals, and δ _CP=0,π is excluded at more than 90 2σ credible level using a flat prior in δ _CP, and just below 2σ using a flat prior in sinδ _CP. When the external constraint on sin ^2θ _13 is removed, sin ^2θ _13=28.0^+2.8_-6.5× 10^-3, in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.

We report an updated measurement of the nu(mu)-induced, and the first measurement of the (nu) over bar (mu)- induced coherent charged pion production cross section on C-12 nuclei in the Tokai-to-Kamioka experiment. This is measured in a restricted region of the final- state phase space for which p(mu,pi) > 0.2 GeV, cos(theta(mu)) > 0.8 and cos(theta(pi)) > 0.6, and at a mean ( anti)neutrino energy of 0.85 GeVusing the T2K near detector. The measured nu(mu) charged current coherent pion production flux-averaged cross section on C-12 is (2.98 +/- 0.37(stat) +/- 0.31(syst)(-0.00)(+0.49)(Q(2) model)) x 10(-40) cm(2). The new measurement of the (nu) over bar (mu)-induced cross section on C-12 is (3.05 +/- 0.71(stat) +/- 0.39(syst)(-0.00)(+-0.74) (Q(2) model)) x 10(-40) cm(2). The results are compatible with both the NEUT 5.4.0 Berger-Sehgal (2009) and GENIE 2.8.0 Rein-Sehgal (2007) model predictions.

The T2K experiment presents new measurements of neutrino oscillation parameters using 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 4.7×1020 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 sin2θ13 and the impact of priors on the δCP measurement. Both analyses prefer the normal mass ordering and upper octant of sin2θ23 with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on sin2θ13 from reactors, sin2θ23=0.561-0.032+0.021 using Feldman-Cousins corrected intervals, and Δm322=2.494-0.058+0.041×10-3eV2 using constant Δχ2 intervals. The CP-violating phase is constrained to δCP=-1.97-0.70+0.97 using Feldman-Cousins corrected intervals, and δCP=0,π is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than 2σ credible level using a flat prior in δCP, and just below 2σ using a flat prior in sinδCP. When the external constraint on sin2θ13 is removed, sin2θ13=28.0-6.5+2.8×10-3, in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.

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 sin2 theta 23 and Delta m232 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 x 1021 and 1.63 x 1021 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.

This paper reports the first measurement of muon neutrino charged-current interactions without pions in the final state using multiple detectors with correlated energy spectra at T2K. The data was collected on hydrocarbon targets using the off-axis T2K near detector (ND280) and the on-axis T2K near detector (INGRID) with neutrino energy spectra peaked at 0.6 GeV and 1.1 GeV respectively. The correlated neutrino flux presents an opportunity to reduce the impact of the flux uncertainty and to study the energy dependence of neutrino interactions. The extracted double-differential cross sections are compared to several Monte Carlo neutrino-nucleus interaction event generators showing the agreement between both detectors individually and with the correlated result.

Abstract The T2K experiment presents new measurements of neutrino oscillation parameters using $$19.7(16.3)\times 10^{20}$$ 19.7 ( 16.3 ) × 10 20 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 × 10 20 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 $$\sin ^2\theta _{13}$$ sin 2 θ 13 and the impact of priors on the $$\delta _{\textrm{CP}}$$ δ CP measurement. Both analyses prefer the normal mass ordering and upper octant of $$\sin ^2\theta _{23}$$ sin 2 θ 23 with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on $$\sin ^2\theta _{13}$$ sin 2 θ 13 from reactors, $$\sin ^2\theta _{23}=0.561^{+0.021}_{-0.032}$$ sin 2 θ 23 = 0 . 561 - 0.032 + 0.021 using Feldman–Cousins corrected intervals, and $$\varDelta {}m^2_{32}=2.494_{-0.058}^{+0.041}\times 10^{-3}~\text {eV}^2$$ Δ m 32 2 = 2 . 494 - 0.058 + 0.041 × 10 - 3 eV 2 using constant $$\varDelta \chi ^{2}$$ Δ χ 2 intervals. The CP-violating phase is constrained to $$\delta _{\textrm{CP}}=-1.97_{-0.70}^{+0.97}$$ δ CP = - 1 . 97 - 0.70 + 0.97 using Feldman–Cousins corrected intervals, and $$\delta _{\textrm{CP}}=0,\pi $$ δ CP = 0 , π is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than $$2\sigma $$ 2 σ credible level using a flat prior in $$\delta _{\textrm{CP}},$$ δ CP , and just below $$2\sigma $$ 2 σ using a flat prior in $$\sin \delta _{\textrm{CP}}.$$ sin δ CP . When the external constraint on $$\sin ^2\theta _{13}$$ sin 2 θ 13 is removed, $$\sin ^2\theta _{13}=28.0^{+2.8}_{-6.5}\times 10^{-3},$$ sin 2 θ 13 = 28 . 0 - 6.5 + 2.8 × 10 - 3 , in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.

The T2K experiment widely uses plastic scintillator as a target for neutrino interactions and an active medium for the measurement of charged particles produced in neutrino interactions at its near detector complex. Over 10 years of operation the measured light yield recorded by the scintillator based subsystems has been observed to degrade by 0.9--2.2\% per year. Extrapolation of the degradation rate through to 2040 indicates the recorded light yield should remain above the lower threshold used by the current reconstruction algorithms for all subsystems. This will allow the near detectors to continue contributing to important physics measurements during the T2K-II and Hyper-Kamiokande eras. Additionally, work to disentangle the degradation of the plastic scintillator and wavelength shifting fibres shows that the reduction in light yield can be attributed to the ageing of the plastic scintillator.

Hyper-Kamiokande (HK) is the next generation underground water Cherenkov detector that builds on the highly successful Super-Kamiokande (SK) experiment. The 260,000-ton detector has an 8.4 times larger fiducial volume than its predecessor. HK's low energy threshold combined with the very large fiducial volume make the detector unique; HK is expected to acquire an unprecedented exposure of 3.8 Mton-year over a period of 20 years starting in 2027. It has an extremely diverse science program including long-baseline neutrino oscillation measurements, nucleon decay searches, atmospheric neutrinos, neutrinos from the sun and supernova explosions, and neutrinos from other astrophysical origins. Like DUNE, the flagship project of the U.S. high-energy physics program, HK measures fundamental properties of neutrinos such as the search for leptonic CP violation and neutrino physics beyond the Standard Model.

We report measurements of the flux-integrated (nu) over bar (mu) and (nu) over bar (mu) + nu(mu) charged-current cross -sections on water and hydrocarbon targets using the T2K anti-neutrino beam with a mean beam energy of 0.86 GeV. The signal is defined as the (anti -)neutrino charged-current interaction with one induced mu(+/-) and no detected charged pion or proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton Module. The phase space of muons is restricted to the high-detection efficiency region, p(mu) > 400 MeV/c and theta(mu) < 30 degrees, in the laboratory frame. An absence of pions and protons in the detectable phase spaces of p(pi) > 200 MeV/c, theta(pi) < 70 degrees and p(p) > 600 MeV/c, theta(p) < 70 degrees is required. In this paper, both the <(nu)over bar>(mu), cross-sections and (nu) over bar (mu) + nu(mu), cross-sections on water and hydrocarbon targets and their ratios are provided by using the D'Agostini unfolding method. The results of the integrated (nu) over bar (mu), cross-section measurements over this phase space are sigma(H2O) = (1.082 +/- 0.068(stat.)(+0.145)(-0.128)(syst.)) x 10(-39) cm(2)/nucleon, sigma(CH) = (1.096 +/- 0.054 (stat.)(+0.132)(-0.117)(syst.)) x 10(-39) cm(2) /nucleon, and sigma(H2O)/sigma(CH) = 0.987 +/- 0.078 (stat.)(+0.093)(-0.090)(syst.). The (nu) over bar (mu), + nu(mu), cross-section is sigma(H2O) = (1.155 +/- 0.064(stat.)(+0.148)(-0.129)(syst.)) x 10(-39) cm(2)/nucleon, sigma(CH) = (1.159 +/- 0.049(stat.)(+0.129)(-0.115)(syst.)) x 10(-39) cm(2)/nucleon, and sigma(H2O)/sigma(CH) = 0.996 +/- 0.069(stat.)(+0.083)(-0.078)(syst.).

This paper reports the first T2K measurement of the transverse kinematic imbalance in the single-$\pi^+$ production channel of neutrino interactions. We measure the differential cross sections in the muon-neutrino charged-current interaction on hydrocarbon with a single $\pi^+$ and at least one proton in the final state, at the ND280 off-axis near detector of the T2K experiment. The extracted cross sections are compared to the predictions from different neutrino-nucleus interaction event generators. Overall, the results show a preference for models which have a more realistic treatment of nuclear medium effects including the initial nuclear state and final-state interactions.

We report measurements of the flux-integrated ν̅_μ and ν̅_μ+ν_μ charged-current cross-sections on water and hydrocarbon targets using the T2K anti-neutrino beam, with a mean neutrino energy of 0.86 GeV. The signal is defined as the (anti-)neutrino charged-current interaction with one induced μ^± and no detected charged pion nor proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton module. The phase space of muons is restricted to the high-detection efficiency region, p_μ>400 MeV/c and θ_μ<30^∘, in the laboratory frame. Absence of pions and protons in the detectable phase space of "p_π>200 MeV/c and θ_π<70^∘", and "p_ p>600 MeV/c and θ_ p<70^∘" is required. In this paper, both of the ν̅_μ cross-sections and ν̅_μ+ν_μ cross-sections on water and hydrocarbon targets, and their ratios are provided by using D'Agostini unfolding method. The results of the integrated ν̅_μ cross-section measurements over this phase space are σ_ H_2O = (1.082±0.068( stat.)^+0.145_-0.128( syst.)) × 10^-39 cm^2/nucleon, σ_ CH = (1.096±0.054( stat.)^+0.132_-0.117( syst.)) × 10^-39 cm^2/nucleon, and σ_ H_2O/σ_ CH = 0.987±0.078( stat.)^+0.093_-0.090( syst.). The ν̅_μ+ν_μ cross-section is σ_ H_2O = (1.155±0.064( stat.)^+0.148_-0.129( syst.)) × 10^-39 cm^2/nucleon, σ_ CH = (1.159±0.049( stat.)^+0.129_-0.115( syst.)) × 10^-39 cm^2/nucleon, and σ_ H_2O/σ_ CH = 0.996±0.069( stat.)^+0.083_-0.078( syst.).

K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, 33 M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E.T. Atkin, Y. Awataguchi, G.J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, 12 S. Bolognesi, T. Bonus, B. Bourguille, S.B. Boyd, A. Bravar, D. Bravo Berguño, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, S. Cao, S.L. Cartwright, M.G. Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, M. Cicerchia, ∗ J. Coleman, G. Collazuol, L. Cook, 27 D. Coplowe, A. Cudd, G. De Rosa, T. Dealtry, C.C. Delogu, S.R. Dennis, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, D. Douqa, T.A. Doyle, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, A.J. Finch, G. Fiorillo, C. Francois, M. Friend, † Y. Fujii, † R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, M. Gonin, A. Gorin, M. Grassi, M. Guigue, D.R. Hadley, P. Hamacher-Baumann, D.A. Harris, M. Hartz, 27 T. Hasegawa, † S. Hassani, N.C. Hastings, Y. Hayato, 27 A. Hiramoto, M. Hogan, J. Holeczek, N.T. Hong Van, 26 T. Honjo, F. Iacob, A.K. Ichikawa, M. Ikeda, T. Ishida, † M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S.J. Jenkins, C. Jesús-Valls, P. Jonsson, C.K. Jung, ‡ P.B. Jurj, M. Kabirnezhad, H. Kakuno, J. Kameda, S.P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, E. Kearns, 27, ‡ 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, L. Labarga, J. Lagoda, M. Lamoureux, D. Last, M. Laveder, M. Lawe, R.P. Litchfield, S.L. Liu, A. Longhin, L. Ludovici, X. Lu, T. Lux, L.N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A.D. Marino, L. Marti-Magro, 27 T. Maruyama, † T. Matsubara, K. Matsushita, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K.S. McFarland, C. McGrew, A. Mefodiev, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, ‡ L. Molina Bueno, S. Moriyama, ‡ Th.A. Mueller, L. Munteanu, Y. Nagai, T. Nakadaira, † M. Nakahata, 27 Y. Nakajima, A. Nakamura, K. Nakamura, 15, † Y. Nakano, S. Nakayama, 27 T. Nakaya, 27 K. Nakayoshi, † C.E.R. Naseby, T.V. Ngoc, ¶ V.Q. Nguyen, K. Niewczas, Y. Nishimura, E. Noah, T.S. Nonnenmacher, F. Nova, J. Nowak, J.C. Nugent, H.M. O’Keeffe, L. O’Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, 27 T. Okusawa, R.A. Owen, Y. Oyama, † V. Palladino, V. Paolone, M. Pari, W.C. Parker, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G.C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, ∗∗ K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P.N. Ratoff, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A.C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, † F. Sánchez, G. Santucci, C.M. Schloesser, K. Scholberg, ‡ M. Scott, Y. Seiya, †† T. Sekiguchi, † H. Sekiya, 27, ‡ D. Sgalaberna, A. Shaikhiev, A. Shaykina, M. Shiozawa, 27 W. Shorrock, A. Shvartsman, K. Skwarczynski, M. Smy, J.T. Sobczyk, H. Sobel, 27 F.J.P. Soler, Y. Sonoda, R. Spina, S. Suvorov, 50 A. Suzuki, S.Y. Suzuki, † Y. Suzuki, A.A. Sztuc, M. Tada, † M. Tajima, A. Takeda, Y. Takeuchi, 27 H.K. Tanaka, ‡ Y. Tanihara, M. Tani, N. Teshima, L.F. Thompson, W. Toki, C. Touramanis, T. Towstego, K.M. Tsui, T. Tsukamoto, † M. Tzanov, Y. Uchida, M. Vagins, 4 S. Valder, D. Vargas, G. Vasseur, C. Vilela, W.G.S. Vinning, T. Vladisavljevic, T. Wachala, J. Walker, J.G. Walsh, Y. Wang, D. Wark, 41 M.O. Wascko, A. Weber, 41 R. Wendell, ‡ M.J. Wilking, C. Wilkinson, J.R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, †† C. Yanagisawa, ‡‡ G. Yang, T. Yano, K. Yasutome, N. Yershov, M. Yokoyama, ‡ T. Yoshida, Y. Yoshimoto, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, M. Zito, and S. Zsoldos

Supernovae are among the most magnificent events in the observable universe. They produce many of the chemical elements necessary for life to exist and their remnants---neutron stars and black holes---are interesting astrophysical objects in their own right. However, despite millennia of observations and almost a century of astrophysical study, the explosion mechanism of supernovae is not yet well understood. Hyper-Kamiokande is a next-generation neutrino detector that will be able to observe the neutrino flux from the next galactic supernova in unprecedented detail. In this thesis, I investigate how well such an observation would allow us to reconstruct the explosion mechanism. I develop a high-precision supernova event generator and use a detailed detector simulation and event reconstruction to explore Hyper-Kamiokande's response to five supernova models simulated by different groups around the world. I show that 300 neutrino events in Hyper-Kamiokande---corresponding to a supernova at a distance of at least 60 kpc---are sufficient to distinguish between these models with high accuracy. These findings indicate that, once the next galactic supernova happens, Hyper-Kamiokande will be able to determine details of the supernova explosion mechanism.

We report measurements by the T2K experiment of the parameters $\theta_23$ and $\Delta m^2_{32}$ which govern the disappearance of muon neutrinos and antineutrinos in the three-flavor PMNSneutrino 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 $1.49\times 10^{21}$ protons on target (POT) in neutrino mode and $1.64\times 10^21$ POT in antineutrino mode are used. Assuming the normal neutrino mass ordering the best-fit values obtained by T2K were $\sin^2\theta_{23}=0.51^{+0.06}_{-0.07}$ $(0.43^{+0.21}_{-0.05})$ and $\Delta m^2_{32}=2.47^{+0.08}_{-0.09} (2.50^{+0.18}_{-0.13})$ $eV^2/c^4$. 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-flavour neutrino oscillation model where the sine of the mixing angle is allowed to take non-physical 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.

K. Abe, J. Adam, H. Aihara, 23 C. Andreopoulos, 27 S. Aoki, A. Ariga, S. Assylbekov, D. Autiero, M. Barbi, G.J. Barker, G. Barr, P. Bartet-Friburg, M. Bass, M. Batkiewicz, F. Bay, V. Berardi, B.E. Berger, 23 S. Berkman, S. Bhadra, F.d.M. Blaszczyk, A. Blondel, S. Bolognesi, S. Bordoni, S.B. Boyd, D. Brailsford, A. Bravar, C. Bronner, N. Buchanan, R.G. Calland, J. Caravaca Rodŕıguez, S.L. Cartwright, R. Castillo, M.G. Catanesi, A. Cervera, D. Cherdack, N. Chikuma, G. Christodoulou, A. Clifton, J. Coleman, S.J. Coleman, G. Collazuol, K. Connolly, L. Cremonesi, A. Dabrowska, I. Danko, R. Das, S. Davis, P. de Perio, G. De Rosa, T. Dealtry, 36 S.R. Dennis, 45 C. Densham, D. Dewhurst, F. Di Lodovico, S. Di Luise, S. Dolan, O. Drapier, K. Duffy, J. Dumarchez, S. Dytman, M. Dziewiecki, S. Emery-Schrenk, A. Ereditato, L. Escudero, C. Ferchichi, T. Feusels, A.J. Finch, G.A. Fiorentini, M. Friend, ∗ Y. Fujii, ∗ Y. Fukuda, A.P. Furmanski, V. Galymov, A. Garcia, S. Giffin, C. Giganti, K. Gilje, D. Goeldi, T. Golan, M. Gonin, N. Grant, D. Gudin, D.R. Hadley, L. Haegel, A. Haesler, M.D. Haigh, P. Hamilton, D. Hansen, T. Hara, M. Hartz, 51 T. Hasegawa, ∗ N.C. Hastings, T. Hayashino, Y. Hayato, 23 C. Hearty, † R.L. Helmer, M. Hierholzer, J. Hignight, A. Hillairet, A. Himmel, T. Hiraki, S. Hirota, J. Holeczek, S. Horikawa, F. Hosomi, K. Huang, A.K. Ichikawa, K. Ieki, M. Ieva, M. Ikeda, J. Imber, J. Insler, T.J. Irvine, T. Ishida, ∗ T. Ishii, ∗ E. Iwai, K. Iwamoto, K. Iyogi, A. Izmaylov, 22 A. Jacob, B. Jamieson, M. Jiang, S. Johnson, J.H. Jo, P. Jonsson, C.K. Jung, ‡ M. Kabirnezhad, A.C. Kaboth, T. Kajita, ‡ H. Kakuno, J. Kameda, Y. Kanazawa, D. Karlen, 51 I. Karpikov, T. Katori, E. Kearns, 23, ‡ M. Khabibullin, A. Khotjantsev, D. Kielczewska, T. Kikawa, A. Kilinski, J. Kim, S. King, J. Kisiel, P. Kitching, T. Kobayashi, ∗ L. Koch, T. Koga, A. Kolaceke, A. Konaka, A. Kopylov, L.L. Kormos, A. Korzenev, Y. Koshio, ‡ W. Kropp, H. Kubo, Y. Kudenko, § R. Kurjata, T. Kutter, J. Lagoda, I. Lamont, E. Larkin, M. Laveder, M. Lawe, M. Lazos, T. Lindner, C. Lister, R.P. Litchfield, A. Longhin, J.P. Lopez, L. Ludovici, L. Magaletti, K. Mahn, M. Malek, S. Manly, A.D. Marino, J. Marteau, J.F. Martin, P. Martins, S. Martynenko, T. Maruyama, ∗ V. Matveev, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, K.S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, P. Mijakowski, C.A. Miller, A. Minamino, O. Mineev, A. Missert, M. Miura, ‡ S. Moriyama, ‡ Th.A. Mueller, A. Murakami, M. Murdoch, S. Murphy, J. Myslik, T. Nakadaira, ∗ M. Nakahata, 23 K.G. Nakamura, K. Nakamura, 14, ∗ S. Nakayama, ‡ T. Nakaya, 23 K. Nakayoshi, ∗ C. Nantais, C. Nielsen, M. Nirkko, K. Nishikawa, ∗ Y. Nishimura, J. Nowak, H.M. O’Keeffe, R. Ohta, ∗ K. Okumura, 23 T. Okusawa, W. Oryszczak, S.M. Oser, T. Ovsyannikova, R.A. Owen, Y. Oyama, ∗ V. Palladino, J.L. Palomino, V. Paolone, D. Payne, O. Perevozchikov, J.D. Perkin, Y. Petrov, L. Pickard, E.S. Pinzon Guerra, C. Pistillo, P. Plonski, E. Poplawska, B. Popov, ¶ M. Posiadala-Zezula, J.-M. Poutissou, R. Poutissou, P. Przewlocki, B. Quilain, E. Radicioni, P.N. Ratoff, M. Ravonel, M.A.M. Rayner, A. Redij, M. Reeves, E. Reinherz-Aronis, C. Riccio, P.A. Rodrigues, P. Rojas, E. Rondio, S. Roth, A. Rubbia, D. Ruterbories, A. Rychter, R. Sacco, K. Sakashita, ∗ F. Sánchez, F. Sato, E. Scantamburlo, K. Scholberg, ‡ S. Schoppmann, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, ∗ H. Sekiya, 23, ‡ D. Sgalaberna, R. Shah, 36 F. Shaker, D. Shaw, M. Shiozawa, 23 S. Short, Y. Shustrov, P. Sinclair, B. Smith, M. Smy, J.T. Sobczyk, H. Sobel, 23 M. Sorel, L. Southwell, P. Stamoulis, J. Steinmann, B. Still, Y. Suda, A. Suzuki, K. Suzuki, S.Y. Suzuki, ∗ Y. Suzuki, 23 R. Tacik, 51 M. Tada, ∗ S. Takahashi, A. Takeda, Y. Takeuchi, 23 H.K. Tanaka, ‡ H.A. Tanaka, † M.M. Tanaka, ∗ D. Terhorst, R. Terri, L.F. Thompson, A. Thorley, S. Tobayama, W. Toki, T. Tomura, Y. Totsuka,∗∗ C. Touramanis, T. Tsukamoto, ∗ M. Tzanov, Y. Uchida, A. Vacheret, M. Vagins, 5 G. Vasseur, T. Wachala, K. Wakamatsu, C.W. Walter, ‡ D. Wark, 36 W. Warzycha, M.O. Wascko, A. Weber, 36 R. Wendell, ‡ R.J. Wilkes, M.J. Wilking, C. Wilkinson, Z. Williamson, J.R. Wilson, R.J. Wilson, T. Wongjirad, Y. Yamada, ∗ K. Yamamoto, C. Yanagisawa, †† T. Yano, S. Yen, N. Yershov, M. Yokoyama, ‡ J. Yoo, K. Yoshida, T. Yuan, M. Yu, A. Zalewska, J. Zalipska, L. Zambelli, ∗ K. Zaremba, M. Ziembicki, E.D. Zimmerman, M. Zito, and J. Żmuda

This paper reports the first simultaneous measurement of the double differential muon neutrino charged-current cross section on oxygen and carbon without pions in the final state as a function of the outgoing muon kinematics, made at the ND280 off-axis near detector of the T2K experiment. The ratio of the oxygen and carbon cross sections is also provided to help validate various models' ability to extrapolate between carbon and oxygen nuclear targets, as is required in T2K oscillation analyses. The data are taken using a neutrino beam with an energy spectrum peaked at 0.6 GeV. The extracted measurement is compared with the prediction from different Monte Carlo neutrino-nucleus interaction event generators, showing particular model separation for very forward-going muons. Overall, of the models tested, the result is best described using Local Fermi Gas descriptions of the nuclear ground state with RPA suppression.

Abstract The electron (anti-)neutrino component of the T2K neutrino beam constitutes the largest background in the measurement of electron (anti-)neutrino appearance at the far detector. The electron neutrino scattering is measured directly with the T2K off-axis near detector, ND280. The selection of the electron (anti-)neutrino events in the plastic scintillator target from both neutrino and anti-neutrino mode beams is discussed in this paper. The flux integrated single differential charged-current inclusive electron (anti-)neutrino cross-sections, dσ/dp and dσ/d cos(θ), and the total cross-sections in a limited phase-space in momentum and scattering angle (p > 300 MeV/c and θ ≤ 45°) are measured using a binned maximum likelihood fit and compared to the neutrino Monte Carlo generator predictions, resulting in good agreement.

We report the measurements of single and double differential cross section of muon neutrino charged-current interactions on carbon with a single positively charged pion in the final state at the T2K off-axis near detector using $5.56\times10^{20}$ protons on target. The analysis uses data control samples for the background subtraction and the cross section signal, defined as a single negatively charged muon and a single positively charged pion exiting from the target nucleus, is extracted using an unfolding method. The model dependent cross section, integrated over the T2K off-axis neutrino beam spectrum peaking at $0.6$~GeV, is measured to be $\sigma = (11.76 \pm 0.44 \text{(stat)} \pm 2.39 \text{(syst)}) \times 10^{-40} \text{cm}^2$~$\text{nucleon}^{-1}$. Various differential cross sections are measured, including the first measurement of the Adler angles for single charged pion production in neutrino interactions with heavy nuclei target.