Measurement of the mesonic decay branch of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>K</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:math> quasibound state
Bibliographic record
Abstract
We conducted measurements of ${K}^{\ensuremath{-}}+^{3}\mathrm{He}\ensuremath{\rightarrow}\ensuremath{\pi}YN+{N}^{\ensuremath{'}}$ reactions using a $1\phantom{\rule{4pt}{0ex}}\mathrm{GeV}/c\phantom{\rule{4pt}{0ex}}{K}^{\ensuremath{-}}$-beam, with the objective of understanding the broad decay width of $\overline{K}NN$ (approximately twice as broad as that of $\mathrm{\ensuremath{\Lambda}}(1405)$ considered to be the $\overline{K}N$ quasibound state). We successfully reproduced distributions of the $\ensuremath{\pi}YN$ invariant mass and momentum transfer for $\ensuremath{\pi}YN$ using model-fitting functions for $\overline{K}NN$ formation and quasifree $\overline{K}$ absorption (${\mathrm{QF}}_{\overline{K}\ensuremath{-}\mathrm{abs}}$) processes. The model can describe the experimental data quite well, and four $\overline{K}NN\ensuremath{\rightarrow}\ensuremath{\pi}YN$ cross sections were obtained. The results indicate that mesonic decay is the dominant decay branch of $\overline{K}NN$. The results also suggest that ${\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\pi}\mathrm{\ensuremath{\Lambda}}N}\ensuremath{\approx}{\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\pi}\mathrm{\ensuremath{\Sigma}}N}$, which indicates that the ${I}_{\overline{K}N}=1$ absorption channel, in addition to the ${I}_{\overline{K}N}=0$ absorption channel, substantially contributes to the $\overline{K}NN$ decay, making the $\overline{K}NN$ state approximately twice as unstable as $\mathrm{\ensuremath{\Lambda}}$(1405).
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How this classification was reachedexpand
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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.041 | 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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
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".