UdeM-GPP-TH-04-121 McGill 11/04 Measuring New-Physics Parameters in B Penguin Decays
Bibliographic record
Abstract
We examine new-physics (NP) effects in B decays with large ¯b → ¯s penguin amplitudes. Decays involving ¯b → ¯ d penguins are assumed to be unaffected. We consider a model-independent parametrization of such NP. We argue that NP rescattering is negligible relative to that of the standard model. This allows us to describe the NP effects in terms of effective amplitudes Aqq (q = u, d, s, c) and corresponding weak NP phases Φqq. We then consider pairs of neutral B decays which are related by flavour SU(3) in the standard model. One receives a large ¯b → ¯s penguin component and has a NP contribution. The other has a ¯b → ¯ d penguin amplitude and is unaffected by NP. The time-dependent measurement of these two decays allows the measurement of the NP parameters Aqq NP and Φqq. Knowledge of these parameters allows us to rule out many NP models and thus partially identify the new physics.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.029 | 0.005 |
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".