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Bibliographic record
Abstract
We perform a time-dependent amplitude analysis of ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays to extract the $CP$ violation parameters of ${f}_{0}(980){K}_{S}^{0}$ and ${\ensuremath{\rho}}^{0}(770){K}_{S}^{0}$ and the direct $CP$ asymmetry of ${K}^{*+}(892){\ensuremath{\pi}}^{\ensuremath{-}}$. The results are obtained from a data sample of $(383\ifmmode\pm\else\textpm\fi{}3)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ decays, collected with the BABAR detector at the PEP-II asymmetric--energy $B$ factory at SLAC. We find two solutions, with an equivalent goodness-of-fit. Including systematic and Dalitz plot model uncertainties, the combined confidence interval for values of the $CP$ parameter ${\ensuremath{\beta}}_{\mathrm{eff}}$ in ${B}^{0}$ decays to ${f}_{0}(980){K}_{S}^{0}$ is $18\ifmmode^\circ\else\textdegree\fi{}<{\ensuremath{\beta}}_{\mathrm{eff}}<76\ifmmode^\circ\else\textdegree\fi{}$ at 95% confidence level (C.L). $CP$ conservation in ${B}^{0}$ decays to ${f}_{0}(980){K}_{S}^{0}$ is excluded at 3.5 standard deviations including systematic uncertainties. For ${B}^{0}$ decays to ${\ensuremath{\rho}}^{0}(770){K}_{S}^{0}$, the combined confidence interval is $\ensuremath{-}9\ifmmode^\circ\else\textdegree\fi{}<{\ensuremath{\beta}}_{\mathrm{eff}}<57\ifmmode^\circ\else\textdegree\fi{}$ at 95% C.L. In decays to ${K}^{*+}(892){\ensuremath{\pi}}^{\ensuremath{-}}$ we measure the direct $CP$ asymmetry to be ${A}_{CP}=\ensuremath{-}0.20\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.02$. The measured phase difference (including ${B}^{0}{\overline{B}}^{0}$ mixing) between decay amplitudes of ${B}^{0}\ensuremath{\rightarrow}{K}^{*+}(892){\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{K}^{*\ensuremath{-}}(892){\ensuremath{\pi}}^{+}$, excludes the interval $\ensuremath{-}137\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\Delta}\ensuremath{\Phi}({K}^{*+}(892){\ensuremath{\pi}}^{\ensuremath{-}})<\ensuremath{-}5\ifmmode^\circ\else\textdegree\fi{}$ at 95% C.L.
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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 | 0.003 | 0.003 |
| Meta-epidemiology (narrow) | 0.002 | 0.004 |
| Meta-epidemiology (broad) | 0.002 | 0.004 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.004 | 0.004 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.003 | 0.003 |
| Insufficient payload (model declined to judge) | 0.010 | 0.003 |
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".