Differential cross section and photon-beam asymmetry for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>γ</mml:mi><mml:mo></mml:mo></mml:mover><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mi>n</mml:mi></mml:mrow></mml:math> reaction at forward <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> angles 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>1.5</mml:mn></mml:mrow></mml:math>–2.95 GeV
Bibliographic record
Abstract
Differential cross sections and photon-beam asymmetries for the $\stackrel{P\vec}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}n$ reaction have been measured for $0.6<cos{\ensuremath{\theta}}_{\ensuremath{\pi}}<1$ and ${E}_{\ensuremath{\gamma}}=1.5\text{--}2.95\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$ at SPring-8/LEPS. The cross sections monotonically decrease as the photon beam energy increases for $\phantom{\rule{0.28em}{0ex}}0.6<cos{\ensuremath{\theta}}_{\ensuremath{\pi}}<0.9$. However, the energy dependence of the cross sections for $0.9<cos{\ensuremath{\theta}}_{\ensuremath{\pi}}<1$ and ${E}_{\ensuremath{\gamma}}=1.5\text{--}2.2\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$ ($W=1.9\text{--}2.2\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$) is different, which may be due to a nucleon or $\mathrm{\ensuremath{\Delta}}$ resonance. The present cross sections agree well with the previous cross sections measured by other groups and show forward peaking, suggesting significant $t$-channel contributions in this kinematical region. The asymmetries are found to be positive, which can be explained by $\ensuremath{\rho}$ exchange in the $t$ channel. Large positive asymmetries in the small-$|t|$ region, where the $\ensuremath{\rho}$-exchange contribution becomes small, could be explained by introducing $\ensuremath{\pi}$-exchange interference with the $s$ channel.
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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 | 0.008 | 0.007 |
| Meta-epidemiology (narrow) | 0.006 | 0.010 |
| Meta-epidemiology (broad) | 0.003 | 0.012 |
| Bibliometrics | 0.003 | 0.006 |
| Science and technology studies | 0.012 | 0.010 |
| Scholarly communication | 0.009 | 0.008 |
| Open science | 0.011 | 0.013 |
| Research integrity | 0.010 | 0.010 |
| Insufficient payload (model declined to judge) | 0.131 | 0.013 |
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".