Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mi>μ</mml:mi></mml:msub></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>μ</mml:mi></mml:msub></mml:math> charged current inclusive cross sections and their ratio with the T2K off-axis near detector
Bibliographic record
Abstract
We report a measurement of cross section $\ensuremath{\sigma}({\ensuremath{\nu}}_{\ensuremath{\mu}}+\text{nucleus}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}+X)$ and the first measurements of the cross section $\ensuremath{\sigma}({\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}+\text{nucleus}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}+X)$ and their ratio $R(\frac{\ensuremath{\sigma}(\overline{\ensuremath{\nu}})}{\ensuremath{\sigma}(\ensuremath{\nu})})$ at (anti) neutrino energies below 1.5 GeV. We determine the single momentum bin cross section measurements, averaged over the T2K $\overline{\ensuremath{\nu}}/\ensuremath{\nu}$-flux, for the detector target material (mainly carbon, oxygen, hydrogen and copper) with phase space restricted laboratory frame kinematics of ${\ensuremath{\theta}}_{\ensuremath{\mu}}<32\ifmmode^\circ\else\textdegree\fi{}$ and ${p}_{\ensuremath{\mu}}>500\text{ }\text{ }\mathrm{MeV}/c$. The results are $\ensuremath{\sigma}(\overline{\ensuremath{\nu}})=(0.900\ifmmode\pm\else\textpm\fi{}0.029(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.088(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}39}$ and $\ensuremath{\sigma}(\ensuremath{\nu})=(2.41\ifmmode\pm\else\textpm\fi{}0.022(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.231(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}39}$ in units of ${\mathrm{cm}}^{2}/\mathrm{nucleon}$ and $R(\frac{\ensuremath{\sigma}(\overline{\ensuremath{\nu}})}{\ensuremath{\sigma}(\ensuremath{\nu})})=0.373\ifmmode\pm\else\textpm\fi{}0.012(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.015(\mathrm{syst})$.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.024 | 0.008 |
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".