Inclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="italic">Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup></mml:math>production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>annihilations at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>10.54</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></mml:math>and in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">Υ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>decays
Bibliographic record
Abstract
We present measurements of the total production rates and momentum distributions of the charmed baryon ${\mathit{\ensuremath{\Lambda}}}_{c}^{+}$ in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{\text{hadrons}}$ at a center-of-mass energy of 10.54 GeV and in $\mathit{\ensuremath{\Upsilon}}(4S)$ decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ events, allowing direct studies of $c$-quark fragmentation. We measure a momentum distribution for ${\mathit{\ensuremath{\Lambda}}}_{c}^{+}$ baryons that differs significantly from those measured previously for charmed mesons. Comparing with a number of models, we find none that can describe the distribution completely. We measure an average scaled momentum of $⟨{x}_{p}⟩=0.574\ifmmode\pm\else\textpm\fi{}0.009$ and a total rate of ${N}_{\mathit{\ensuremath{\Lambda}}c}^{q\overline{q}}=0.057\ifmmode\pm\else\textpm\fi{}0.002(\mathrm{exp}.)\ifmmode\pm\else\textpm\fi{}0.015(\mathrm{BF})\text{ }\text{ }{\mathit{\ensuremath{\Lambda}}}_{c}^{+}$ per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, $p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$. In $\mathit{\ensuremath{\Upsilon}}(4S)$ decays we measure a total rate of ${N}_{\mathit{\ensuremath{\Lambda}}c}^{\mathit{\ensuremath{\Upsilon}}}=0.091\ifmmode\pm\else\textpm\fi{}0.006(\mathrm{exp}.)\ifmmode\pm\else\textpm\fi{}0.024(\mathrm{BF})$ per $\mathit{\ensuremath{\Upsilon}}(4S)$ decay, and find a much softer momentum distribution than expected from $B$ decays into a ${\mathit{\ensuremath{\Lambda}}}_{c}^{+}$ plus an antinucleon and one to three pions.
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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 | 0.002 | 0.005 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.003 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.010 | 0.009 |
| Open science | 0.004 | 0.005 |
| Research integrity | 0.004 | 0.005 |
| Insufficient payload (model declined to judge) | 0.531 | 0.583 |
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".