Tag der mundlichen Prufung: 02.07.2004
Bibliographic record
Abstract
iThe pion-nucleon sigma term, which is an important parameter in chiral perturbation theory and a measure of explicit chiral symmetry breaking of QCD due to non-vanishing current quark masses, can be extracted from elas-tic p scattering data using partial wave analyses and dispersion relations. However, results of recent analyses yield a very large value for the sigma term, which leads to problems with the interpretation. Since the quality of the database on which the extraction is based is crucial for the result and there are known problems with incompatible measurements and scarce low energy data available, a new experiment was carried out within the CHAOS collab-oration. Using the CHAOS detector and a newly developed range telescope covering the extreme forward scattering angles, dierential cross sections in p elastic scattering were measured at 19.9, 25.8, 32.0, 37.1, 43.3, 57.0 and 67.0 MeV pion kinetic energy at the TRIUMF meson factory in Vancouver, Canada. The CHAOS detector consists of tracking chambers and particle identi cation counters in a vertical magnetic eld geometry. This experi-
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.005 | 0.003 |
| Open science | 0.002 | 0.004 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.603 | 0.649 |
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; the direct Gemma label and the distilled Codex classifier 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".