Measurement of CP asymmetry in D0→K−K+ decays
Why this work is in the frame
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Bibliographic record
Abstract
A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D 0 → K − K + is performed using pp collision data, corresponding to an integrated luminosity of 3 fb − 1 , collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D ⁎ + → D 0 π + and D ⁎ − → D ‾ 0 π − decays. The time-integrated CP asymmetry A CP ( K − K + ) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D 0 → K − π + , D + → K − π + π + and D + → K ‾ 0 π + decays used as calibration channels. It is found to be A CP ( K − K + ) = ( 0.14 ± 0.15 (stat) ± 0.10 (syst) ) % . A combination of this result with previous LHCb measurements yields A CP ( K − K + ) = ( 0.04 ± 0.12 (stat) ± 0.10 (syst) ) % , A CP ( π − π + ) = ( 0.07 ± 0.14 (stat) ± 0.11 (syst) ) % . These are the most precise measurements from a single experiment. The result for A CP ( K − K + ) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it