Measurement of upsilon production in 7 TeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math>collisions at ATLAS
Bibliographic record
Abstract
Using $1.8\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $pp$ collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of $\mathit{\ensuremath{\Upsilon}}(1\mathrm{S},2\mathrm{S},3\mathrm{S})$ mesons. $\mathit{\ensuremath{\Upsilon}}$ mesons are reconstructed using the dimuon decay mode. Total production cross sections for ${p}_{\mathrm{T}}<70\text{ }\text{ }\mathrm{GeV}$ and in the rapidity interval $|{y}^{\mathit{\ensuremath{\Upsilon}}}|<2.25$ are measured to be, $8.01\ifmmode\pm\else\textpm\fi{}0.02\ifmmode\pm\else\textpm\fi{}0.36\ifmmode\pm\else\textpm\fi{}0.31\text{ }\text{ }\mathrm{nb}$, $2.05\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.12\ifmmode\pm\else\textpm\fi{}0.08\text{ }\text{ }\mathrm{nb}$, and $0.92\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.04\text{ }\text{ }\mathrm{nb}$, respectively, with uncertainties separated into statistical, systematic, and luminosity measurement effects. In addition, differential cross section times dimuon branching fractions for $\mathit{\ensuremath{\Upsilon}}(1\mathrm{S})$, $\mathit{\ensuremath{\Upsilon}}(2\mathrm{S})$, and $\mathit{\ensuremath{\Upsilon}}(3\mathrm{S})$ as a function of $\mathit{\ensuremath{\Upsilon}}$ transverse momentum ${p}_{\mathrm{T}}$ and rapidity are presented. These cross sections are obtained assuming unpolarized production. If the production polarization is fully transverse or longitudinal with no azimuthal dependence in the helicity frame, the cross section may vary by approximately $\ifmmode\pm\else\textpm\fi{}20%$. If a nontrivial azimuthal dependence is considered, integrated cross sections may be significantly enhanced by a factor of 2 or more. We compare our results to several theoretical models of $\mathit{\ensuremath{\Upsilon}}$ meson production, finding that none provide an accurate description of our data over the full range of $\mathit{\ensuremath{\Upsilon}}$ transverse momenta accessible with this data set.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".