Search for <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:msup><mml:mi>τ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>τ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> at the <i>BaBar</i> Experiment
Bibliographic record
Abstract
We search for the rare flavor-changing neutral current process ${B}^{+}\ensuremath{\rightarrow}{K}^{+}$${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ using data from the BABAR experiment. The data sample, collected at the center-of-mass energy of the $\mathit{\ensuremath{\Upsilon}}(4S)$ resonance, corresponds to a total integrated luminosity of $424\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ and to $471\ifmmode\times\else\texttimes\fi{}1{0}^{6}\text{ }\text{ }\mathrm{B}\overline{\mathrm{B}}$ pairs. We reconstruct one $B$ meson, produced in the $\mathrm{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}{B}^{+}{B}^{\ensuremath{-}}$ decay, in one of many hadronic decay modes and search for activity compatible with a ${B}^{+}\ensuremath{\rightarrow}{K}^{+}$${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ decay in the rest of the event. Each $\ensuremath{\tau}$ lepton is required to decay leptonically into an electron or muon and neutrinos. Comparing the expected number of background events with the data sample after applying the selection criteria, we do not find evidence for a signal. The resulting upper limit, at the 90% confidence level, is $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}})<2.25\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$.
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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 | 0.005 | 0.003 |
| Meta-epidemiology (narrow) | 0.005 | 0.008 |
| Meta-epidemiology (broad) | 0.003 | 0.010 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.010 | 0.010 |
| Scholarly communication | 0.006 | 0.005 |
| Open science | 0.010 | 0.011 |
| Research integrity | 0.005 | 0.007 |
| Insufficient payload (model declined to judge) | 0.026 | 0.011 |
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".