Measurement of double-differential muon neutrino charged-current interactions on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>without pions in the final state using the T2K off-axis beam
Bibliographic record
Abstract
We report the measurement of muon neutrino charged-current interactions on carbon without pions in the final state at the T2K beam energy using $5.734\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target. For the first time the measurement is reported as a flux-integrated, double-differential cross section in muon kinematic variables ($\mathrm{cos}{\ensuremath{\theta}}_{\ensuremath{\mu}}$, ${p}_{\ensuremath{\mu}}$), without correcting for events where a pion is produced and then absorbed by final state interactions. Two analyses are performed with different selections, background evaluations and cross-section extraction methods to demonstrate the robustness of the results against biases due to model-dependent assumptions. The measurements compare favorably with recent models which include nucleon-nucleon correlations but, given the present precision, the measurement does not distinguish among the available models. The data also agree with Monte Carlo simulations which use effective parameters that are tuned to external data to describe the nuclear effects. The total cross section in the full phase space is $\ensuremath{\sigma}=(0.417\ifmmode\pm\else\textpm\fi{}0.047(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.005(\mathrm{stat}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}38}\text{ }\text{ }{\mathrm{cm}}^{2}\text{ }{\text{nucleon}}^{\ensuremath{-}1}$ and the cross section integrated in the region of phase space with largest efficiency and best signal-over-background ratio ($\mathrm{cos}{\ensuremath{\theta}}_{\ensuremath{\mu}}>0.6$ and ${p}_{\ensuremath{\mu}}>200\text{ }\text{ }\mathrm{MeV}$) is $\ensuremath{\sigma}=(0.202\ifmmode\pm\else\textpm\fi{}0.036(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.003(\mathrm{stat}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}38}\text{ }\text{ }{\mathrm{cm}}^{2}\text{ }{\text{nucleon}}^{\ensuremath{-}1}$.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.009 | 0.001 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".