Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at $\\sqrt{s}=8$ TeV with the ATLAS detector
Bibliographic record
Abstract
Measurements of the top--antitop quark pair production charge asymmetry in the dilepton channel are presented using data corresponding to an integrated luminosity of $20.3$ $\\textrm{fb}^{-1}$ from $pp$ collisions at a center-of-mass energy of $\\sqrt{s} = 8$ TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. Inclusive and differential measurements as a function of the invariant mass, transverse momentum, and longitudinal boost of the $t\\bar{t}$ system are performed both in the full phase space and in a fiducial phase space closely matching the detector acceptance. Two observables are studied: $A^{\\ell\\ell}_{\\textrm{C}}$ based on the selected leptons and $A^{t\\bar{t}}_{\\textrm{C}}$ based on the reconstructed $t\\bar{t}$ final state. The inclusive asymmetries are measured in the full phase space to be $A^{\\ell\\ell}_{\\textrm{C}} = 0.008 \\pm 0.006$ and $A^{t\\bar{t}}_{\\textrm{C}} = 0.021 \\pm 0.016$, which are in agreement with the Standard Model predictions of $A^{\\ell\\ell}_{\\textrm{C}} = 0.0064 \\pm 0.0003 $ and $A^{t\\bar{t}}_{\\textrm{C}} = 0.0111 \\pm 0.0004$.
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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 | 0.000 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".