Observation and study of the baryonic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>-meson decays<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mo>*</mml:mo><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:msup><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mo stretchy="false">(</mml:mo><mml:mi>π</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:mi>π</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>
Bibliographic record
Abstract
We present results for $B$-meson decay modes involving a charm meson, protons, and pions using $455\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs recorded by the BaBar detector at the SLAC PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. The branching fractions are measured for the following ten decays: ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}p\overline{p}$, ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*0}p\overline{p}$, ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{+}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*+}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{*0}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*0}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{+}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$, and ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{*+}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$. The four ${B}^{\ensuremath{-}}$ and the two five-body ${\overline{B}}^{0}$ modes are observed for the first time. The four-body modes are enhanced compared to the three- and the five-body modes. In the three-body modes, the $M(p\overline{p})$ and $M({D}^{(*)0}p)$ invariant-mass distributions show enhancements near threshold values. In the four-body mode ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{+}p\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}$, the $M(p{\ensuremath{\pi}}^{\ensuremath{-}})$ distribution shows a narrow structure of unknown origin near $1.5\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. The distributions for the five-body modes, in contrast to the others, are similar to the expectations from uniform phase-space predictions.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 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 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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".