Measurement of Higgs boson production in the diphoton decay channel inppcollisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
Bibliographic record
Abstract
A measurement of the production processes of the recently discovered Higgs boson is performed in the two-photon final state using $4.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of proton-proton collisions data at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ and $20.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ at $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$ collected by the ATLAS detector at the Large Hadron Collider. The number of observed Higgs boson decays to diphotons divided by the corresponding Standard Model prediction, called the signal strength, is found to be $\ensuremath{\mu}=1.17\ifmmode\pm\else\textpm\fi{}0.27$ at the value of the Higgs boson mass measured by ATLAS, ${m}_{H}=125.4\text{ }\text{ }\mathrm{GeV}$. The analysis is optimized to measure the signal strengths for individual Higgs boson production processes at this value of ${m}_{H}$. They are found to be ${\ensuremath{\mu}}_{\mathrm{ggF}}=1.32\ifmmode\pm\else\textpm\fi{}0.38$, ${\ensuremath{\mu}}_{\mathrm{VBF}}=0.8\ifmmode\pm\else\textpm\fi{}0.7$, ${\ensuremath{\mu}}_{WH}=1.0\ifmmode\pm\else\textpm\fi{}1.6$, ${\ensuremath{\mu}}_{ZH}={0.1}_{\ensuremath{-}0.1}^{+3.7}$, and ${\ensuremath{\mu}}_{t\overline{t}H}={1.6}_{\ensuremath{-}1.8}^{+2.7}$, for Higgs boson production through gluon fusion, vector-boson fusion, and in association with a $W$ or $Z$ boson or a top-quark pair, respectively. Compared with the previously published ATLAS analysis, the results reported here also benefit from a new energy calibration procedure for photons and the subsequent reduction of the systematic uncertainty on the diphoton mass resolution. No significant deviations from the predictions of the Standard Model are found.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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) | 0.002 | 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 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".