Search for New<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>T</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math>Particles in Final States with Large Jet Multiplicities and Missing Transverse Energy in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>
Bibliographic record
Abstract
We present a search for a new particle ${T}^{\ensuremath{'}}$ decaying to a top quark via ${T}^{\ensuremath{'}}\ensuremath{\rightarrow}t+X$, where $X$ goes undetected. We use a data sample corresponding to $5.7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity of $p\overline{p}$ collisions with $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, collected at Fermilab Tevatron by the CDF II detector. Our search for pair production of ${T}^{\ensuremath{'}}$ is focused on the hadronic decay channel, $p\overline{p}\ensuremath{\rightarrow}{T}^{\ensuremath{'}}{\overline{T}}^{\ensuremath{'}}\ensuremath{\rightarrow}t\overline{t}+X\overline{X}\ensuremath{\rightarrow}bq\overline{q}\overline{b}q\overline{q}+X\overline{X}$. We interpret our results in terms of a model where ${T}^{\ensuremath{'}}$ is an exotic fourth generation quark and $X$ is a dark matter particle. The data are consistent with standard model expectations. We set a limit on the generic production of ${T}^{\ensuremath{'}}{\overline{T}}^{\ensuremath{'}}\ensuremath{\rightarrow}t\overline{t}+X\overline{X}$, excluding the fourth generation exotic quarks ${T}^{\ensuremath{'}}$ at 95% confidence level up to ${m}_{{T}^{\ensuremath{'}}}=400\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ for ${m}_{X}\ensuremath{\le}70\text{ }\text{ }\mathrm{GeV}/{c}^{2}$.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.003 |
| Bibliometrics | 0.004 | 0.006 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.003 | 0.003 |
| Open science | 0.002 | 0.003 |
| Research integrity | 0.003 | 0.002 |
| Insufficient payload (model declined to judge) | 0.264 | 0.172 |
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".