Search for decays of the Higgs boson into scalar particles decaying into four or six b quarks using pp collisions at (Formula presented) = 13 TeV with the ATLAS detector
Bibliographic record
Abstract
A search for exotic decays of the Higgs boson \( H \) into new scalar or pseudoscalar particles that subsequently decay into \( b \)-quarks is presented. The search considers \( Z H \) production with several decay scenarios for the Higgs boson; first to a pair of identical scalars, \( H \rightarrow 2a \rightarrow 4b \), second to a pair of scalars with different masses (\( m_{a1} < m_{a2} \)), either directly, \( H \rightarrow a_1 a_2 \rightarrow 4b \), or via a longer decay chain, \( H \rightarrow a_1 a_2 \rightarrow 3a_1 \rightarrow 6b \). The analysis uses proton-proton collision data at \( \sqrt{s} = 13 \text{ TeV} \) collected with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of \( 140 \text{ fb}^{-1} \). No significant excess above the Standard Model prediction is observed. The search sets upper limits at 95% confidence level on the ratio of the Higgs boson production cross section to the SM prediction times the branching ratio of Higgs bosons decaying into \( 4b \) or \( 6b \), between 4% and 25% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow 2a \rightarrow 4b) \), between 24% and 38% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow a_1 a_2 \rightarrow 4b) \), and between 10% and 20% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow a_1 a_2 \rightarrow 3a_1 \rightarrow 6b) \), depending on the masses of the scalar particles.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".