Neutron Lifetime and Axial Coupling Connection
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Bibliographic record
Abstract
Experimental studies of neutron decay, $n\ensuremath{\rightarrow}pe\overline{\ensuremath{\nu}}$, exhibit two anomalies. The first is a 8.6(2.1) s, roughly $4\ensuremath{\sigma}$ difference between the average beam measured neutron lifetime, ${\ensuremath{\tau}}_{n}^{\mathrm{beam}}=888.0(2.0)\text{ }\text{ }\mathrm{s}$, and the more precise average trapped ultracold neutron determination, ${\ensuremath{\tau}}_{n}^{\mathrm{trap}}=879.4(6)\text{ }\text{ }\mathrm{s}$. The second is a $5\ensuremath{\sigma}$ difference between the pre2002 average axial coupling, ${g}_{A}$, as measured in neutron decay asymmetries ${g}_{A}^{\mathrm{pre}2002}=1.2637(21)$, and the more recent, post2002, average ${g}_{A}^{\mathrm{post}2002}=1.2755(11)$, where, following the UCNA Collaboration division, experiments are classified by the date of their most recent result. In this Letter, we correlate those ${\ensuremath{\tau}}_{n}$ and ${g}_{A}$ values using a (slightly) updated relation ${\ensuremath{\tau}}_{n}(1+3{g}_{A}^{2})=5172.0(1.1)\text{ }\text{ }\mathrm{s}$. Consistency with that relation and better precision suggest ${\ensuremath{\tau}}_{n}^{\text{favored}}=879.4(6)\text{ }\text{ }\mathrm{s}$ and ${g}_{A}^{\text{favored}}=1.2755(11)$ as preferred values for those parameters. Comparisons of ${g}_{A}^{\text{favored}}$ with recent lattice QCD and muonic hydrogen capture results are made. A general constraint on exotic neutron decay branching ratios, $<0.27%$, is discussed and applied to a recently proposed solution to the neutron lifetime puzzle.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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