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.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".