First measurement of the muon neutrino charged current single pion production cross section on water with the T2K near detector
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Bibliographic record
Abstract
The T2K off-axis near detector, ND280, is used to make the first differential cross section measurements of muon neutrino charged current single positive pion production on a water target at energies $\ensuremath{\sim}0.8\text{ }\text{ }\mathrm{GeV}$. The differential measurements are presented as a function of the muon and pion kinematics, in the restricted phase space defined by ${p}_{{\ensuremath{\pi}}^{+}}>200\text{ }\text{ }\mathrm{MeV}/c$, ${p}_{\ensuremath{\mu}}>200\text{ }\text{ }\mathrm{MeV}/c$, $\mathrm{cos}({\ensuremath{\theta}}_{{\ensuremath{\pi}}^{+}})>0.3$ and $\mathrm{cos}({\ensuremath{\theta}}_{\ensuremath{\mu}})>0.3$. The total flux integrated ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ charged current single positive pion production cross section on water in the restricted phase space is measured to be $⟨\ensuremath{\sigma}{⟩}_{\ensuremath{\phi}}=4.25\ifmmode\pm\else\textpm\fi{}0.48(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.56(\mathrm{syst})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}40}\text{ }\text{ }{\mathrm{cm}}^{2}/\text{nucleon}$. The total cross section is consistent with the NEUT prediction ($5.03\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}40}\text{ }\text{ }{\mathrm{cm}}^{2}/\text{nucleon}$) and $2\ensuremath{\sigma}$ lower than the GENIE prediction ($7.68\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}40}\text{ }\text{ }{\mathrm{cm}}^{2}/\text{nucleon}$). The differential cross sections are in good agreement with the NEUT generator. The GENIE simulation reproduces well the shapes of the distributions, but overestimates the overall cross section normalization.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it