Bibliographic record
Abstract
This thesis presents a study of inclusive production of charmonium mesons at the U (4S) resonance ( s = 10.58 GeV) and in the continuum up to 50 MeV below the resonance. The full dataset of BABAR Run 1 (an integrated luminosity of 23.3 fb-1) is used in the analysis. The branching fractions of B mesons to J/ y , y (2S), cc1 and cc2 are measured: BB→J/yX = (1.044 +/- 0.013 +/- 0.035)%, BB→y2S X = (0.274 +/- 0.020 +/- 0.029)%, BB→cc1X = (0.378 +/- 0.034 +/- 0.026)% and BB→cc2X < 0.21%. By equating the y (2S) production rates calculated using the y (2S) → ℓ+ℓ- final state to those using y (2S) → pi+pi- J/ y , we obtain competitive measurements of the y (2S) → ℓ+ℓ- branching fractions: By2S →e+e- = (0.815 +/- 0.090 +/- 0.090)% and By2S →m+m- = (0.700 +/- 0.083 +/- 0.093)%. The cross-section for J/ y production in e+e - annihilation in the continuum is measured to be: se+e-→J/yX = (2.47 +/- 0.21 +/- 0.20) pb. This cross-section excludes J/ y mesons from B decays, two-photon or initial state radiation processes. An upper limit on the inclusive non-BB¯ J/ y decays of the U (4S) is set at BU4S →J/yX < 5.1 x 10-4, for J/ y with the center of mass momentum above 2 GeV/c. The helicity, the center of mass production angle distribution and the center of mass momentum distribution of the reconstructed J/ y mesons are presented.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| 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".