Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Asymmetry in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:mtext>−</mml:mtext><mml:msup><mml:mrow><mml:mover accent="true"><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mo accent="true" stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Mixing with Inclusive Dilepton Events
Bibliographic record
Abstract
We present a measurement of the asymmetry ${A}_{CP}$ between same-sign inclusive dilepton samples ${\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{+}$ and ${\ensuremath{\ell}}^{\ensuremath{-}}{\ensuremath{\ell}}^{\ensuremath{-}}$ ($\ensuremath{\ell}=e$, $\ensuremath{\mu}$) from semileptonic $B$ decays in $\mathrm{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}B\overline{B}$ events, using the complete data set recorded by the BABAR experiment near the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance, corresponding to $471\ifmmode\times\else\texttimes\fi{}1{0}^{6}$ $B\overline{B}$ pairs. The asymmetry ${A}_{CP}$ allows comparison between the mixing probabilities $\mathcal{P}({\overline{B}}^{0}\ensuremath{\rightarrow}{B}^{0})$ and $\mathcal{P}({B}^{0}\ensuremath{\rightarrow}{\overline{B}}^{0})$, and therefore probes $CP$ and $T$ violation. The result, ${A}_{CP}=[\ensuremath{-}3.9\ifmmode\pm\else\textpm\fi{}3.5(\text{stat})\ifmmode\pm\else\textpm\fi{}1.9(\text{syst})]\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}3}$, is consistent with the standard model expectation.
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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 | 0.003 | 0.016 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.006 | 0.010 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.233 | 0.142 |
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".