Ortho-Para Transition Rate in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi></mml:math>-Molecular Hydrogen and the Proton’s Induced Pseudoscalar Coupling<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>g</mml:mi><mml:mi>p</mml:mi></mml:msub></mml:math>
Why this work is in the frame
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Bibliographic record
Abstract
We report a measurement of the ortho-para transition rate in the $p\ensuremath{\mu}p$ molecule. The experiment was conducted at TRIUMF via the measurement of the time dependence of the 5.2 MeV neutrons from muon capture in liquid hydrogen. The measurement yielded an ortho-para rate ${\ensuremath{\Lambda}}_{\mathrm{op}}=(11.1\ifmmode\pm\else\textpm\fi{}1.7\ifmmode\pm\else\textpm\fi{}\genfrac{}{}{0}{}{0.9}{0.6})\ifmmode\times\else\texttimes\fi{}{10}^{4}\text{ }\text{ }{\mathrm{s}}^{\ensuremath{-}1}$, which is substantially larger than the earlier result of Bardin et al. The result has striking implications for the proton's induced pseudoscalar coupling ${g}_{p}$, changing the value of ${g}_{p}$ obtained from the most precise ordinary muon capture measurement from $10.6\ifmmode\pm\else\textpm\fi{}2.7$ to $0.8\ifmmode\pm\else\textpm\fi{}2.8$, and from the sole radiative muon capture measurement from $12.2\ifmmode\pm\else\textpm\fi{}1.1$ to $10.6\ifmmode\pm\else\textpm\fi{}1.2$, bringing the latter result closer to theoretical predictions.
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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 | 0.003 | 0.000 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.001 | 0.002 |
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