Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>Λ</mml:mi></mml:math>from threshold to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:mrow></mml:msub></mml:mrow><mml:mo>=</mml:mo><mml:mn>750</mml:mn><mml:mn/><mml:mi/><mml:mi mathvariant="normal">MeV</mml:mi><mml:mo>/</mml:mo><mml:mi>c</mml:mi></mml:math>
Bibliographic record
Abstract
The results of a search for ${K}^{\ensuremath{-}}\stackrel{\ensuremath{\rightarrow}}{p}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\Lambda}$ (where the $3{\ensuremath{\pi}}^{0}$'s are not from $\ensuremath{\eta}$-meson decay) are presented. The data were obtained with the Crystal Ball spectrometer at eight beam momenta from 514 to $750\mathrm{MeV}/c.$ For the six beam momenta below ${p}_{{K}^{\ensuremath{-}}}=714\mathrm{MeV}/c,$ no signal was found; the 90% C.L. upper limit obtained for the ${K}^{\ensuremath{-}}\stackrel{\ensuremath{\rightarrow}}{p}3{\ensuremath{\pi}}^{0}\ensuremath{\Lambda}$ total cross section ${\ensuremath{\sigma}}_{t}$ varies between 2 and $7\ensuremath{\mu}\mathrm{b}.$ This small upper limit is indicative that spontaneous ${\ensuremath{\pi}}^{0}$ emission is insignificant, since the ${K}^{\ensuremath{-}}\stackrel{\ensuremath{\rightarrow}}{p}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\Lambda}$ threshold is at ${p}_{{K}^{\ensuremath{-}}}=397\mathrm{MeV}/c.$ A signal was observed only at ${p}_{{K}^{\ensuremath{-}}}=750\mathrm{MeV}/c,$ with ${\ensuremath{\sigma}}_{t}=25\ifmmode\pm\else\textpm\fi{}7\ensuremath{\mu}\mathrm{b}.$ These results can be explained only if triple ${\ensuremath{\pi}}^{0}$ production goes predominantly by hyperon resonance deexcitation, ${K}^{\ensuremath{-}}\stackrel{\ensuremath{\rightarrow}}{p}{\ensuremath{\Sigma}}^{*}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\Lambda}}^{*}.$ There are several candidates for the ${\ensuremath{\Sigma}}^{*}$ but only one for the ${\ensuremath{\Lambda}}^{*},$ namely, the $\ensuremath{\Lambda}(1520){\frac{3}{2}}^{\ensuremath{-}},$ as the threshold for ${K}^{\ensuremath{-}}\stackrel{\ensuremath{\rightarrow}}{p}{\ensuremath{\pi}}^{0}\ensuremath{\Lambda}(1520)$ is at ${p}_{{K}^{\ensuremath{-}}}=704\mathrm{MeV}/c.$
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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 | 0.008 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.003 |
| Bibliometrics | 0.006 | 0.006 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.006 | 0.010 |
| Open science | 0.004 | 0.005 |
| Research integrity | 0.004 | 0.003 |
| Insufficient payload (model declined to judge) | 0.668 | 0.659 |
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".