Measurement of the photon beam asymmetry in <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>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi mathvariant="normal">Σ</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>8.5</mml:mn></mml:mrow></mml:math> GeV
Bibliographic record
Abstract
We report measurements of the photon beam asymmetry $\mathrm{\ensuremath{\Sigma}}$ for the reaction $\stackrel{P\vec}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}{K}^{+}{\mathrm{\ensuremath{\Sigma}}}^{0}$(1193) using the GlueX spectrometer in Hall D at Jefferson Lab. Data were collected by using a linearly polarized photon beam in the energy range of 8.2--8.8 GeV incident on a liquid hydrogen target. The beam asymmetry $\mathrm{\ensuremath{\Sigma}}$ was measured as a function of the Mandelstam variable $t$, and a single value of $\mathrm{\ensuremath{\Sigma}}$ was extracted for events produced in the $u$ channel. These are the first exclusive measurements of the photon beam asymmetry $\mathrm{\ensuremath{\Sigma}}$ for the reaction in this energy range. For the $t$ channel, the measured beam asymmetry is close to unity over the $t$ range studied, $\ensuremath{-}t=(0.1--1.4)\phantom{\rule{3.33333pt}{0ex}}$($\mathrm{GeV}/{c)}^{2}$, with an average value of $\mathrm{\ensuremath{\Sigma}}=1.00\ifmmode\pm\else\textpm\fi{}0.05$. This agrees with theoretical models that describe the reaction via the natural-parity exchange of the ${K}^{*}$(892) Regge trajectory. A value of $\mathrm{\ensuremath{\Sigma}}=0.41\ifmmode\pm\else\textpm\fi{}\phantom{\rule{3.33333pt}{0ex}}0.09$ is obtained for the $u$ channel integrated up to $\ensuremath{-}u=2.0$ ($\mathrm{GeV}/{c)}^{2}$.
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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 | 0.007 | 0.006 |
| Meta-epidemiology (narrow) | 0.005 | 0.009 |
| Meta-epidemiology (broad) | 0.002 | 0.011 |
| Bibliometrics | 0.002 | 0.006 |
| Science and technology studies | 0.007 | 0.007 |
| Scholarly communication | 0.006 | 0.007 |
| Open science | 0.011 | 0.010 |
| Research integrity | 0.008 | 0.009 |
| Insufficient payload (model declined to judge) | 0.296 | 0.012 |
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".