First measurement of differential cross sections and photon beam asymmetries for photoproduction of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>f</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>980</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> meson decaying into <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:mrow></mml:math> at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>E</mml:mi><mml:mi>γ</mml:mi></mml:msub><mml:mo><</mml:mo><mml:mn>2.4</mml:mn></mml:mrow></mml:math> GeV
Bibliographic record
Abstract
For the first time, differential cross sections and photon beam asymmetries were measured for the reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}{f}_{0}(980)p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}p$ by using a linearly polarized photon beam up to $2.4\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$ and a liquid hydrogen target. The ${f}_{0}$(980) photoproduction signal was clearly observed owing to the absence of contributions from vector-meson photoproduction. The results indicate the $t$-channel exchange of vector mesons as a mechanism of the ${f}_{0}(980)$ photoproduction at ${E}_{\ensuremath{\gamma}}\ensuremath{\approx}2.1\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$, putting constraints on the nature of ${f}_{0}(980)$.
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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 | 0.009 | 0.008 |
| Meta-epidemiology (narrow) | 0.005 | 0.009 |
| Meta-epidemiology (broad) | 0.002 | 0.011 |
| Bibliometrics | 0.003 | 0.007 |
| Science and technology studies | 0.010 | 0.010 |
| Scholarly communication | 0.007 | 0.007 |
| Open science | 0.010 | 0.012 |
| Research integrity | 0.008 | 0.009 |
| Insufficient payload (model declined to judge) | 0.336 | 0.008 |
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; both teacher heads 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".