Publications: Cross-Sections

Measurements of νμ​-bar and νμ-bar​+νμ​ charged-current cross-sections without detected pions or protons on water and hydrocarbon at a mean anti-neutrino energy of 0.86 GeV

We report measurements of the flux-integrated |νμ-bar​| and |νμ-bar+νμ​| 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 |μ±| 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.

• arXiv preprint: https://arxiv.org/abs/2004.13989
• DOI: https://doi.org/10.1093/ptep/ptab014
• Reference: PTEP 2021 (2021) 4, 043C01
• Data release: https://doi.org/10.5281/zenodo.7065209

First T2K measurement of transverse kinematic imbalance in the muon-neutrino charged-current single-π+ production channel containing at least one proton

This paper reports the first T2K measurement of the transverse kinematic imbalance in the single-π+ production channel of neutrino interactions. We measure the differential cross sections in the muon-neutrino charged-current interaction on hydrocarbon with a single-π+ 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.

• arXiv preprint: https://arxiv.org/abs/2102.03346
• DOI: https://doi.org/10.1103/PhysRevD.103.112009
• Reference: Phys.Rev.D 103 (2021) 11, 112009
• Data release: https://t2k-experiment.org/results/2021_tki_numucc1pinp/

Simultaneous measurement of the muon neutrino charged-current cross section on oxygen and carbon without pions in the final state at T2K

This paper reports the first simultaneous measurement of the double differential muon neutrinocharged-current cross section on oxygen and carbon without pions in the final state as a function ofthe 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 oscillationanalyses.  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-goingmuons. Overall, of the models tested, the result is best described using Local Fermi Gas descriptionsof the nuclear ground state with RPA suppression.

• arXiv preprint: https://arxiv.org/abs/2004.05434
• DOI: https://doi.org/10.1103/PhysRevD.101.112004
• Reference: Phys.Rev.D 101 (2020) 11, 112004

First Measurement of the Charged Current antinumu Double Differential Cross Section on a Water Target without Pions in the final state

This paper reports the first differential measurement of the charged-current muon-antineutrino interaction cross section on water with no pions in the final state. The unfolded flux-averaged measurement using the T2K off-axis near detector is given in double-differential bins of ${\mu }^{+}$ momentum and angle. The integrated cross section in a restricted phase space is $\sigma =(1.11\pm 0.18)\times {10E}^{-}{\mathrm{cm}}^2$ per water molecule. Comparisons with several nuclear models are also presented.

• arXiv preprint: https://arxiv.org/abs/1908.10249
• DOI: https://doi.org/10.1103/PhysRevD.102.012007
• Reference: Phys.Rev.D 102 (2020) 1, 012007

Measurement of the charged-current electron (anti-)neutrino inclusive cross-sections at the T2K off-axis near detector ND280

• arXiv preprint: https://arxiv.org/abs/2002.11986
• DOI: https://doi.org/10.1007/JHEP10(2020)114
• Data release: https://t2k-experiment.org/results/2020_nuecc/
• Reference: JHEP 10 (2020) 114

First combined measurement of the muon neutrino and antineutrino charged-current cross section without pions in the final state at T2K

This paper presents the first combined measurement of the double-differential muon neutrino and antineutrino charged-current cross sections with no pions in the final state on hydrocarbon at the off-axis near detector of the T2K experiment. The data analyzed in this work comprise 5.8×1020 and 6.3×1020 protons on target in neutrino and antineutrino mode respectively, at a beam energy peak of 0.6 GeV. Using the two measured cross sections, the sum, difference and asymmetry were calculated with the aim of better understanding the nuclear effects involved in such interactions. The extracted measurements have been compared with the prediction from different Monte Carlo generators and theoretical models showing that the difference between the two cross sections have interesting sensitivity to nuclear effects. Data release can found

• arXiv preprint: https://arxiv.org/abs/2002.09323
• Data release: https://t2k-experiment.org/results/first-combined-measurement-of-the-muon-neutrino-and-antineutrino-charged-current-cross-section-without-pions-in-the-final-state-at-t2k/
• DOI: https://doi.org/10.1103/PhysRevD.101.112001
• Reference: Phys.Rev.D 101 (2020) 11, 112001

Measurement of the muon neutrino charged-current single $\pi^+$ production on hydrocarbon using the T2K off-axis near detector ND280

We report the measurements of the 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 × 10^20 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 σ = (11.76 +-  0.44 (stat)   +- 2.39 (syst) × 10^-40 cm^2/nucleon. 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.

• arXiv preprint: https://arxiv.org/abs/1909.03936
• Data release: https://t2k-experiment.org/results/data-release-for-measurement-of-the-muon-neutrino-charged-current-single-pi-production-on-hydrocarbon-using-the-t2k-off-axis-near-detector-nd280/
• DOI: https://doi.org/10.1103/PhysRevD.101.012007
• Reference: Phys.Rev.D 101 (2020) 1, 012007

Measurement of neutrino- and antineutrino-oxygen neutral-current quasielastic-like interaction cross sections by detecting nuclear de-excitation gamma-rays at the far detector with Run1-9 FHC and RHC data

• arXiv preprint: https://arxiv.org/abs/1910.09439
• DOI: https://doi.org/10.1103/PhysRevD.100.112009
• Reference: Phys.Rev.D 100 (2019) 11, 112009

Measurement of the muon neutrino charged-current cross sections on water, hydrocarbon and iron, and their ratios, with the T2K on-axis detectors

We report a measurement of the flux-integrated νμ charged-current cross sections on water, hydrocarbon, and iron in the T2K on-axis neutrino beam with a mean neutrino energy of 1.5 GeV. The measured cross sections on water, hydrocarbon, and iron are

σ^{H2O}_{CC}=(0.840±0.010(stat.)+0.10−0.08(syst.))×10−38cm2/nucleon, σ^{CH}_{CC}=(0.817±0.007(stat.)+0.11−0.08(syst.))×10−38cm2/nucleon, and σ^{Fe}_CC=(0.859±0.003(stat.)+0.12−0.10(syst.))×10−38cm2/nucleon,

respectively, for a restricted phase space of induced muons: θμ<45∘ and pμ>0.4 GeV/c in the laboratory frame. The measured cross section ratios are σ^{H2O}_{CC}/σ^{CH}_CC=1.028±0.016(stat.)±0.053(syst.)⁠, σ^{Fe}_{CC}/σ^{H2O}_{CC}=1.023±0.012(stat.)±0.058(syst.)⁠, and σ^{Fe}_{CC}/σ^{CH}_{CC}=1.049±0.010(stat.)±0.043(syst.)⁠. These results, with an unprecedented precision for the measurements of neutrino cross sections on water in the studied energy region, show good agreement with the current neutrino interaction models used in the T2K oscillation analyses.

• arXiv preprint: https://arxiv.org/abs/1904.09611
• DOI: https://doi.org/10.1093/ptep/ptz070
• Reference: PTEP 2019 (2019) 9, 093C02