High-$E_{\rm T}$ isolated-photon plus jets production in $pp$ collisions at $\sqrt s=$ 8 TeV with the ATLAS detector
Bibliographic record
Abstract
CERN-LHC. Measurements of the cross section for prompt photon plus jet production in proton-proton collisions at a centre-of-mass energy of 8 TeV with 20.2/fb of data collected in 2012. The photon is required to have a transverse energy above 130 GeV and absolute value of pseudorapity |etaGamma|<2.37, excluding the region 1.37<|etaGamma|<1.56. The photon isolation is ensured by requiring the transverse energy around a cone of radius R=0.4 around the photon to be less than 10 GeV. At particle level it is the sum of transverse energy from all particles, except for muons, neutrinos and the photon itself. At parton level it is the sum of energy from all coloured partons. Jets are reconstructed using the anti-kt algorithm with radius parameter R=0.6 and required to have the jet rapidity in the range |yjet|<4.4 and the distance between the jet and the photon DeltaR(gamma jet)>1. The requirements on the jet transverse momenta depend on the sample and are as follows. Photon+1jet sample (tables 1 and 2): pTjet1 > 100 GeV. Photon+1jet sample (tables 3 to 13): pTjet1 > 100 GeV, |yjet1| < 2.37, |costhetastar| < 0.83 and |etaGamma + yjet1| < 2.37 and mgammajet1 > 467 GeV. Photon+2jet sample (tables 14 to 17): pTjet1 > 100 GeV and pTjet2 > 65 GeV. Photon+2jet sample (tables 18 and 20): pTjet1 > 100 GeV, pTjet2 > 65 GeV and 130 < ETGamma < 300 GeV. Photon+2jet sample (tables 19 and 21): pTjet1 > 100 GeV, pTjet2 > 65 GeV and ETGamma > 300 GeV. Photon+2jet sample (table 22): pTjet1 > 130 GeV, pTjet2 > 50 GeV, Delta R(gamma jet1) > 3, 1 < Delta R(jet1 jet2) < 1.5 and |etajet1| < 2.37. Photon+2jet sample (table 23): pTjet1 > 130 GeV, pTjet2 > 50 GeV, Delta R(gamma jet1) > 3, 1 < Delta R(gamma jet2) < 1.5, |etajet1| < 2.37 and pTjet2 < ETGamma. Photon+2jet sample (table 24): ratio of cross sections in tables 22 and 23. Photon+3jet sample (tables 25 to 29): pTjet1 > 100 GeV, pTjet2 > 65 GeV and pTjet3 > 50 GeV. Photon+3jet sample (tables 30, 32 and 34): pTjet1 > 100 GeV, pTjet2 > 65 GeV, pTjet3 > 50 GeV and 130 < ETGamma < 300 GeV. Photon+3jet sample (tables 31, 33 and 35): pTjet1 > 100 GeV, pTjet2 > 65 GeV, pTjet3 > 50 GeV and ETGamma > 300 GeV.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.009 | 0.002 |
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 source (direct Gemma or distilled Codex), 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".