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Bibliographic record
Abstract
We measure the time-dependent $CP$ asymmetry in the radiative-penguin decay ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}\ensuremath{\gamma}$, using a sample of $471\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\mathrm{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}B\overline{B}$ events recorded with the BABAR detector at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ storage ring at SLAC. Using events with ${m}_{K\ensuremath{\pi}\ensuremath{\pi}}<1.8\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, we measure the branching fractions of ${B}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}\ensuremath{\gamma}$ and ${B}^{0}\ensuremath{\rightarrow}{K}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}\ensuremath{\gamma}$, the branching fractions of the kaonic resonances decaying to ${K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, as well as the overall branching fractions of the ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{K}^{+}\ensuremath{\gamma}$, ${B}^{+}\ensuremath{\rightarrow}{K}^{*0}{\ensuremath{\pi}}^{+}\ensuremath{\gamma}$ and $S$-wave ${B}^{+}\ensuremath{\rightarrow}(K\ensuremath{\pi}{)}_{0}^{*0}{\ensuremath{\pi}}^{+}\ensuremath{\gamma}$ components. For events from the $\ensuremath{\rho}$ mass band, we measure the $CP$-violating parameters ${\mathcal{S}}_{{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}}=0.14\ifmmode\pm\else\textpm\fi{}0.25\ifmmode\pm\else\textpm\fi{}0.03$ and ${\mathcal{C}}_{{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}}=\ensuremath{-}0.39\ifmmode\pm\else\textpm\fi{}0.2{0}_{\ensuremath{-}0.02}^{+0.03}$, where the first uncertainties are statistical and the second are systematic. We extract from this measurement the time-dependent $CP$ asymmetry related to the $CP$ eigenstate ${\ensuremath{\rho}}^{0}{K}_{S}^{0}$ and obtain ${\mathcal{S}}_{{K}_{S}^{0}\ensuremath{\rho}\ensuremath{\gamma}}=\ensuremath{-}0.18\ifmmode\pm\else\textpm\fi{}0.3{2}_{\ensuremath{-}0.05}^{+0.06}$, which provides information on the photon polarization in the underlying $b\ensuremath{\rightarrow}s\ensuremath{\gamma}$ transition.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.044 | 0.006 |
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".