Search for new light gauge bosons in Higgs boson decays to four-lepton final states inppcollisions ats=8 TeV</mml:…
Bibliographic record
Abstract
This paper presents a search for Higgs bosons decaying to four leptons, either electrons or muons, via one or two light exotic gauge bosons ${Z}_{d}$, $H\ensuremath{\rightarrow}Z{Z}_{d}\ensuremath{\rightarrow}4\ensuremath{\ell}$ or $H\ensuremath{\rightarrow}{Z}_{d}{Z}_{d}\ensuremath{\rightarrow}4\ensuremath{\ell}$. The search was performed using $pp$ collision data corresponding to an integrated luminosity of about $20\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ at the center-of-mass energy of $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$ recorded with the ATLAS detector at the Large Hadron Collider. The observed data are well described by the Standard Model prediction. Upper bounds on the branching ratio of $H\ensuremath{\rightarrow}Z{Z}_{d}\ensuremath{\rightarrow}4\ensuremath{\ell}$ and on the kinetic mixing parameter between the ${Z}_{d}$ and the Standard Model hypercharge gauge boson are set in the range $(1--9)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}5}$ and $(4--17)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}2}$ respectively, at 95% confidence level assuming the Standard Model branching ratio of $H\ensuremath{\rightarrow}Z{Z}^{*}\ensuremath{\rightarrow}4\ensuremath{\ell}$, for ${Z}_{d}$ masses between 15 and 55 GeV. Upper bounds on the effective mass mixing parameter between the $Z$ and the ${Z}_{d}$ are also set using the branching ratio limits in the $H\ensuremath{\rightarrow}Z{Z}_{d}\ensuremath{\rightarrow}4\ensuremath{\ell}$ search, and are in the range $(1.5--8.7)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}4}$ for $15<{m}_{{Z}_{d}}<35\text{ }\text{ }\mathrm{GeV}$. Upper bounds on the branching ratio of $H\ensuremath{\rightarrow}{Z}_{d}{Z}_{d}\ensuremath{\rightarrow}4\ensuremath{\ell}$ and on the Higgs portal coupling parameter, controlling the strength of the coupling of the Higgs boson to dark vector bosons are set in the range $(2--3)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}5}$ and $(1--10)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}4}$ respectively, at 95% confidence level assuming the Standard Model Higgs boson production cross sections, for ${Z}_{d}$ masses between 15 and 60 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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 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 | 0.000 |
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".