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Bibliographic record
Abstract
Using a sample of $88.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected with the BABAR detector at the PEP-II storage rings at the Stanford Linear Accelerator Center, we measure the branching fractions of seven color-suppressed B-meson decays: $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0})=[2.9\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.3(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*0}{\ensuremath{\pi}}^{0})=[2.9\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}\ensuremath{\eta})=[2.5\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.3(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*0}\ensuremath{\eta})=[2.6\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}\ensuremath{\omega})=[3.0\ifmmode\pm\else\textpm\fi{}0.3(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*0}\ensuremath{\omega})=[4.2\ifmmode\pm\else\textpm\fi{}0.7(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.9(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\eta}}^{\ensuremath{'}})=[1.7\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ We set the 90% confidence-level upper limit: $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*0}{\ensuremath{\eta}}^{\ensuremath{'}})<2.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ The channels ${B}^{0}\ensuremath{\rightarrow}{D}^{*0}\ensuremath{\eta},$ ${D}^{*0}\ensuremath{\omega},$ and ${D}^{0}{\ensuremath{\eta}}^{\ensuremath{'}}$ are seen with more than five-sigma statistical significance. All of these branching fractions are significantly larger than theoretical expectations based on the ``naive'' factorization model.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.002 |
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".