Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties
Bibliographic record
Abstract
We present new measurements of the inclusive forward-backward $t\overline{t}$ production asymmetry, ${A}_{\mathrm{FB}}$, and its dependence on several properties of the $t\overline{t}$ system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, corresponding to an integrated luminosity of $9.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. We measure the asymmetry using the rapidity difference $\ensuremath{\Delta}y={y}_{t}\ensuremath{-}{y}_{\overline{t}}$. Parton-level results are derived, yielding an inclusive asymmetry of $0.164\ifmmode\pm\else\textpm\fi{}0.047(\mathrm{stat}+\mathrm{syst})$. We establish an approximately linear dependence of ${A}_{\mathrm{FB}}$ on the top-quark pair mass ${M}_{t\overline{t}}$ and the rapidity difference $|\ensuremath{\Delta}y|$ at detector and parton levels. Assuming the standard model, the probabilities to observe the measured values or larger for the detector-level dependencies are $7.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ and $2.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ for ${M}_{t\overline{t}}$ and $|\ensuremath{\Delta}y|$ respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the $t\overline{t}$ system at the detector level. These results are consistent with previous lower-precision measurements and provide additional quantification of the functional dependencies of the asymmetry.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".