Measurements of electroweak W$^{±}$Z boson pair production in association with two jets in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector
Bibliographic record
Abstract
A bstract Measurements of integrated and differential cross-sections for electroweak W ± Z production in association with two jets ( W ± Zjj ) in proton-proton collisions are presented. The data collected by the ATLAS detector at the Large Hadron Collider from 2015 to 2018 at a centre-of-mass energy of $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV are used, corresponding to an integrated luminosity of 140 fb − 1 . The W ± Zjj candidate events are reconstructed using leptonic decay modes of the gauge bosons. Events containing three identified leptons, either electrons or muons, and two jets are selected. Processes involving pure electroweak W ± Zjj production at Born level are separated from W ± Zjj production involving a strong coupling. The measured integrated fiducial cross-section of electroweak W ± Zjj production per lepton flavour is $$ {\sigma}_{WZjj- EW\to {\ell}^{\prime}\nu \mathcal{ll} jj} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mtext>WZjj</mml:mtext> <mml:mo>−</mml:mo> <mml:mi>EW</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>ℓ</mml:mi> <mml:mo>′</mml:mo> </mml:msup> <mml:mi>ν</mml:mi> <mml:mi>ll</mml:mi> <mml:mi>jj</mml:mi> </mml:mrow> </mml:msub> </mml:math> = 0 . 368 ± 0 . 037 (stat . ) ± 0 . 059 (syst . ) ± 0 . 003 (lumi . ) fb, where ℓ and ℓ ′ are either an electron or a muon. Respective cross-sections of electroweak and strong W ± Zjj production are measured separately for events with exactly two jets or with more than two jets, and in three bins of the invariant mass of the two jets. The inclusive W ± Zjj production cross-section, without separating electroweak and strong production, is also measured to be $$ {\sigma}_{WZjj\to {\ell}^{\prime}\nu \mathcal{ll} jj} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mtext>WZjj</mml:mtext> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>ℓ</mml:mi> <mml:mo>′</mml:mo> </mml:msup> <mml:mi>ν</mml:mi> <mml:mi>ll</mml:mi> <mml:mi>jj</mml:mi> </mml:mrow> </mml:msub> </mml:math> = 1 . 462 ± 0 . 063 (stat . ) ± 0 . 118 (syst . ) ± 0 . 012 (lumi . ) fb, per lepton flavour. The inclusive W ± Zjj production cross-section is measured differentially for several kinematic observables. Finally, the measurements are used to constrain anomalous quartic gauge couplings by extracting 95% confidence level intervals on dimension-8 operators.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 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".