Pole position of Λ(1405) measured in d(K−,n)πΣ reactions
Bibliographic record
Abstract
We measured a set of π ± Σ ∓ , π 0 Σ 0 , and π − Σ 0 invariant mass spectra below and above the K ¯ N mass threshold in K − -induced reactions on deuteron . The measured π Σ mass spectral shape is well reproduced via the two-step mechanism, i . e ., a neutron knocked out at a forward angle from a deuteron by an incident K − , with the K ¯ recoiled backward reacting with the residual nucleon to produce π and Σ. We deduced the S -wave K ¯ N → π Σ and K ¯ N → K ¯ N scattering amplitudes in the isospin 0 channel in the framework of a K ¯ N and π Σ coupled channel. We find that a resonance pole corresponding to Λ ( 1405 ) is located at 1417.7 − 7.4 + 6.0 (fitting errors) − 1.0 + 1.1 (systematic errors) + [ − 26.1 − 7.9 + 6.0 (fitting errors) − 2.0 + 1.7 (systematic errors)] i MeV/ c 2 , closer to the K ¯ N mass threshold than the value determined by the Particle Data Group.
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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 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".