Measurement of the absolute branching fractions for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>D</mml:mi><mml:mi>s</mml:mi><mml:mo>−</mml:mo></mml:msubsup><mml:mo>→</mml:mo><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msub><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>ℓ</mml:mi></mml:msub></mml:math>and extraction of the decay constant<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>f</mml:mi><mml:msub><mml:mi>D</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:msub></mml:math>
Bibliographic record
Abstract
The absolute branching fractions for the decays ${D}_{s}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}}$ ($\ensuremath{\ell}=e$, $\ensuremath{\mu}$, or $\ensuremath{\tau}$) are measured using a data sample corresponding to an integrated luminosity of $521\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected at center-of-mass energies near 10.58 GeV with the BABAR detector at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ collider at SLAC. The number of ${D}_{s}^{\ensuremath{-}}$ mesons is determined by reconstructing the recoiling system $DKX\ensuremath{\gamma}$ in events of the type ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}DKX{D}_{s}^{*\ensuremath{-}}$, where ${D}_{s}^{*\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{\ensuremath{-}}\ensuremath{\gamma}$ and $X$ represents additional pions from fragmentation. The ${D}_{s}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\ell}}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ events are detected by full or partial reconstruction of the recoiling system $DKX\ensuremath{\gamma}\ensuremath{\ell}$. The branching fraction measurements are combined to determine the ${D}_{s}^{\ensuremath{-}}$ decay constant ${f}_{{D}_{s}}=(258.6\ifmmode\pm\else\textpm\fi{}6.4\ifmmode\pm\else\textpm\fi{}7.5)\text{ }\text{ }\mathrm{MeV}$, where the first uncertainty is statistical and the second is systematic.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.046 | 0.016 |
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".