Measurements of the Absolute Branching Fractions of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:msub><mml:mi>X</mml:mi><mml:mrow><mml:mi>c</mml:mi><mml:mover accent="true"><mml:mi>c</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:mrow></mml:msub></mml:math>
Bibliographic record
Abstract
A study of the two-body decays ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{X}_{c\overline{c}}{K}^{\ifmmode\pm\else\textpm\fi{}}$, where ${X}_{c\overline{c}}$ refers to one charmonium state, is reported by the BABAR Collaboration using a data sample of $424\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The absolute determination of branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found for the decay ${B}^{+}\ensuremath{\rightarrow}X(3872){K}^{+}$ at the $3\ensuremath{\sigma}$ level. The absolute branching fraction $\mathcal{B}[{B}^{+}\ensuremath{\rightarrow}X(3872){K}^{+}]=[2.1\ifmmode\pm\else\textpm\fi{}0.6(\text{stat})\ifmmode\pm\else\textpm\fi{}0.3(\text{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ is measured for the first time. It follows that $\mathcal{B}[X(3872)\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}]=(4.1\ifmmode\pm\else\textpm\fi{}1.3)%$, supporting the hypothesis of a molecular component for this resonance.
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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 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.023 | 0.005 |
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".