Precision Tau and Electron Neutral Current Asymmetry Measurements from the Tau Polarization at OPAL
Bibliographic record
Abstract
A measurement of the τ lepton polarization and forward-backward asymmetry near the Z0 resonance using the OPAL detector is described. The measurement is based on analysis of [Formula: see text], [Formula: see text], τ → π (K) ντ, τ → ρ ντ and τ → a1 ντ decays from a sample of 144, 810 e + e - → τ+ τ- candidates corresponding to an integrated luminosity of 151 pb-1. Assuming that the τ lepton decays according to V - A theory, we measure the average τ polarization near [Formula: see text] to be τ> = (-14.11 ± 0.73 ± 0.56)% and the τ polarization forward-backward asymmetry to be [Formula: see text], where the first error is statistical and the second systematic. These results are consistent with the hypothesis of lepton universality and, within the context of the Standard Model, combine to produce [Formula: see text].
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".