Measurement of the hadronic photon structure function F2 at LEP2
Bibliographic record
Abstract
The hadronic structure function of the photon F 2 γ ( x , Q 2 ) is measured as a function of Bjorken x and of the photon virtuality Q 2 using deep-inelastic scattering data taken by the OPAL detector at LEP at e + e − centre-of-mass energies from 183 to 209 GeV. Previous OPAL measurements of the x dependence of F 2 γ are extended to an average Q 2 of 〈 Q 2 〉=780 GeV 2 using data in the kinematic range 0.15< x <0.98. The Q 2 evolution of F 2 γ is studied for 12.1<〈 Q 2 〉<780 GeV 2 using three ranges of x . As predicted by QCD, the data show positive scaling violations in F 2 γ with F 2 γ (Q 2 )/α=(0.08 ± 0.02 +0.05 −0.03 )+(0.13 ± 0.01 +0.01 −0.01 ) ln Q 2 , where Q 2 is in GeV 2 , for the central x region 0.10–0.60. Several parameterisations of F 2 γ are in qualitative agreement with the measurements whereas the quark-parton model prediction fails to describe the data.
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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".