Search for vectorlikeBquarks in events with one isolated lepton, missing transverse momentum, and jets ats=8 TeV</mml:math…
Bibliographic record
Abstract
A search has been performed for pair production of heavy vectorlike down-type ($B$) quarks. The analysis explores the lepton-plus-jets final state, characterized by events with one isolated charged lepton (electron or muon), significant missing transverse momentum, and multiple jets. One or more jets are required to be tagged as arising from $b$ quarks, and at least one pair of jets must be tagged as arising from the hadronic decay of an electroweak boson. The analysis uses the full data sample of $pp$ collisions recorded in 2012 by the ATLAS detector at the LHC, operating at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of $20.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. No significant excess of events is observed above the expected background. Limits are set on vectorlike $B$ production, as a function of the $B$ branching ratios, assuming the allowable decay modes are $B\ensuremath{\rightarrow}Wt/Zb/Hb$. In the chiral limit with a branching ratio of 100% for the decay $B\ensuremath{\rightarrow}Wt$, the observed (expected) 95% C.L. lower limit on the vectorlike $B$ mass is 810 GeV (760 GeV). In the case where the vectorlike $B$ quark has branching ratio values corresponding to those of an $SU(2)$ singlet state, the observed (expected) 95% C.L. lower limit on the vectorlike $B$ mass is 640 GeV (505 GeV). The same analysis, when used to investigate pair production of a colored, charge $5/3$ exotic fermion ${T}_{5/3}$, with subsequent decay ${T}_{5/3}\ensuremath{\rightarrow}Wt$, sets an observed (expected) 95% C.L. lower limit on the ${T}_{5/3}$ mass of 840 GeV (780 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) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".