Observation and measurement of Higgs boson decays toWW*with the ATLAS detector
Bibliographic record
Abstract
We report the observation of Higgs boson decays to $W{W}^{*}$ based on an excess over background of 6.1 standard deviations in the dilepton final state, where the Standard Model expectation is 5.8 standard deviations. Evidence for the vector-boson fusion (VBF) production process is obtained with a significance of 3.2 standard deviations. The results are obtained from a data sample corresponding to an integrated luminosity of $25\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ from $\sqrt{s}=7$ and 8 TeV $pp$ collisions recorded by the ATLAS detector at the LHC. For a Higgs boson mass of 125.36 GeV, the ratio of the measured value to the expected value of the total production cross section times branching fraction is $1.0{9}_{\ensuremath{-}0.15}^{+0.16}{(\mathrm{stat})}_{\ensuremath{-}0.14}^{+0.17}(\text{syst})$. The corresponding ratios for the gluon fusion and vector-boson fusion production mechanisms are $1.02\ifmmode\pm\else\textpm\fi{}0.19{(\mathrm{stat})}_{\ensuremath{-}0.18}^{+0.22}(\text{syst})$ and $1.2{7}_{\ensuremath{-}0.40}^{+0.44}{(\mathrm{stat})}_{\ensuremath{-}0.21}^{+0.30}(\text{syst})$, respectively. At $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$, the total production cross sections are measured to be $\ensuremath{\sigma}(gg\ensuremath{\rightarrow}H\ensuremath{\rightarrow}W{W}^{*})=4.6\ifmmode\pm\else\textpm\fi{}0.9{(\mathrm{stat})}_{\ensuremath{-}0.7}^{+0.8}(\text{syst})\text{ }\text{ }\mathrm{pb}$ and $\ensuremath{\sigma}(\mathrm{V}\mathrm{B}\mathrm{F} H\ensuremath{\rightarrow}W{W}^{*})=0.5{1}_{\ensuremath{-}0.15}^{+0.17}{(\mathrm{stat})}_{\ensuremath{-}0.08}^{+0.13}(\text{syst})\text{ }\text{ }\mathrm{pb}$. The fiducial cross section is determined for the gluon-fusion process in exclusive final states with zero or one associated jet.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".