Measurement of the Charge Asymmetry in SemileptonicBs0Decays
Bibliographic record
Abstract
We have performed the first direct measurement of the time-integrated flavor untagged charge asymmetry in semileptonic ${B}_{s}^{0}$ decays ${A}_{\mathrm{SL}}^{s,\mathrm{unt}}$ by comparing the decay rate of ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{D}_{s}^{\ensuremath{-}}\ensuremath{\nu}X$, where ${D}_{s}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$, with the charge-conjugate ${\overline{B}}_{s}^{0}$ decay rate. This sample was selected from $1.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected by the D0 experiment in run II of the Fermilab Tevatron collider. We obtain ${A}_{\mathrm{SL}}^{s,\mathrm{unt}}=[1.23\ifmmode\pm\else\textpm\fi{}0.97(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.17(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$. Assuming that $\ensuremath{\Delta}{m}_{s}/{\overline{\ensuremath{\Gamma}}}_{s}\ensuremath{\gg}1$, this result can be translated into a measurement of the $CP$-violating phase in ${B}_{s}^{0}$ mixing: $\ensuremath{\Delta}{\ensuremath{\Gamma}}_{s}/\ensuremath{\Delta}{m}_{s}\mathrm{tan}{\ensuremath{\phi}}_{s}=\phantom{\rule{0ex}{0ex}}[2.45\ifmmode\pm\else\textpm\fi{}1.93(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.35(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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".