Structure near the<i>K<sup>−</sup>+ p + p</i>threshold in the in-flight<sup>3</sup>He(<i>K</i><sup>−</sup>, Λ<i>p</i>)<i>n</i>reaction
Bibliographic record
Abstract
To search for an |${\rm S} = -1$| di-baryonic state which decays to |$\Lambda p$|, the |${}^3{\rm He}(K^-,\Lambda p)n_{\rm missing}$| reaction was studied at 1.0 |${\rm GeV}/c$|. Unobserved neutrons were kinematically identified from the missing mass |$M_{X}$| of the |${}^3{\rm He}(K^-,\Lambda p)X$| reaction in order to have a large acceptance for the |$\Lambda pn$| final state. The observed |$\Lambda pn$| events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three-nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the |$\Lambda p$|. To account for the observed peak structure, the simplest S-wave pole was assumed to exist in the reaction channel, having a Breit–Wigner form in energy and with a Gaussian form factor. A minimum |$\chi ^2$| method was applied to deduce its mass, |$M_X = 2355^{+6}_{-8}$| (stat.) |$\pm $|12 (syst.) |${\rm MeV}/c^2$|, and decay width, |$\Gamma _X = 110^{+19}_{-17}$| (stat.) |$\pm $|27 (syst.) |${\rm MeV}/c^2$|, respectively. The form factor parameter |$Q_X \sim $| 400 |${\rm MeV}/c$| implies that the range of the interaction is about 0.5 fm.
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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 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.011 | 0.001 |
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".