Exclusive <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> electroproduction off the proton from low to high <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>−</mml:mo><mml:mi>t</mml:mi></mml:mrow></mml:math>
Bibliographic record
Abstract
Background: Measurements of exclusive meson production are a useful tool in the study of hadronic structure. In particular, one can discern the relevant degrees of freedom at different distance scales through these studies.Purpose: To study the transition between nonperturbative and perturbative quantum chromodynamics as the square of four-momentum transfer to the struck proton, $\ensuremath{-}t$, is increased.Method: Cross sections for the $^{1}\mathrm{H}(e,{e}^{\ensuremath{'}}{\ensuremath{\pi}}^{+})n$ reaction were measured over the $\ensuremath{-}t$ range of 0.272 to 2.127 ${\mathrm{GeV}}^{2}$ with limited azimuthal coverage at fixed beam energy of 4.709 GeV, ${Q}^{2}$ of 2.4 ${\mathrm{GeV}}^{2}$, and $W$ of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall C.Results: The $\ensuremath{-}t$ dependence of the measured ${\ensuremath{\pi}}^{+}$ electroproduction cross section generally agrees with prior data from JLab Halls B and C. The data are consistent with a Regge amplitude-based theoretical model but show poor agreement with a generalized parton distribution--based model.Conclusion: The agreement of cross sections with prior data implies small contribution from the interference terms, and the confirmation of the change in $t$ slopes between the low- and high-$\ensuremath{-}t$ regions previously observed in photoproduction indicates the changing nature of the electroproduction reaction in our kinematic regime.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.108 | 0.031 |
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".