Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi></mml:math>Decays to Charmonium States:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">B</mml:mi><mml:mo>→</mml:mo><mml:mi mathvariant="italic">η</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi><mml:mi/><mml:mo>→</mml:mo><mml:mi/><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi><mml:mn>0</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:math>
Bibliographic record
Abstract
In a sample of $9.66\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs collected with the CLEO detector we make the first observation of $B$ decays to an ${\ensuremath{\eta}}_{c}$ and a kaon. We measure branching fractions $B({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}{K}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({0.69}_{\ensuremath{-}0.21}^{+0.26}\ifmmode\pm\else\textpm\fi{}0.08\ifmmode\pm\else\textpm\fi{}0.20)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ and $B(B\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}K\ifmmode^\circ\else\textdegree\fi{})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({1.09}_{\ensuremath{-}0.42}^{+0.55}\ifmmode\pm\else\textpm\fi{}0.12\ifmmode\pm\else\textpm\fi{}0.31)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, where the first error is statistical, the second is systematic, and the third is from the ${\ensuremath{\eta}}_{c}$ branching fraction uncertainty. From these we extract the ${\ensuremath{\eta}}_{c}$ decay constant in the factorization approximation, ${f}_{{\ensuremath{\eta}}_{c}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}335\ifmmode\pm\else\textpm\fi{}75\mathrm{MeV}$. We also search for $B$ decays to a ${\ensuremath{\chi}}_{c0}$ and a kaon. No evidence for a signal is found and we set $90%$ C.L. upper limits: $B({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c0}{K}^{+})<4.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $B(B\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c0}K\ifmmode^\circ\else\textdegree\fi{})<5.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$.
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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 | 0.008 | 0.005 |
| Meta-epidemiology (narrow) | 0.006 | 0.010 |
| Meta-epidemiology (broad) | 0.002 | 0.010 |
| Bibliometrics | 0.002 | 0.006 |
| Science and technology studies | 0.008 | 0.009 |
| Scholarly communication | 0.009 | 0.008 |
| Open science | 0.011 | 0.012 |
| Research integrity | 0.008 | 0.008 |
| Insufficient payload (model declined to judge) | 0.439 | 0.013 |
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".