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Bibliographic record
Abstract
The beauty to up quark coupling constant $|{V}_{ub}|$ can be extracted from $B\ensuremath{\rightarrow}\ensuremath{\rho}{e}^{+}{\ensuremath{\nu}}_{e}$ combined with the form factors for $D\ensuremath{\rightarrow}{K}^{*}{e}^{+}{\ensuremath{\nu}}_{e}$ and $B\ensuremath{\rightarrow}V{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ and $D\ensuremath{\rightarrow}\ensuremath{\rho}{e}^{+}{\ensuremath{\nu}}_{e}$. Using the entire CLEO-c $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}D\overline{D}$ event sample, corresponding to an integrated luminosity of $818\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ and approximately $5.4\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $D\overline{D}$ events, we measure the form factors for the decays ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{\ensuremath{-}}{e}^{+}{\ensuremath{\nu}}_{e}$ and ${D}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{e}^{+}{\ensuremath{\nu}}_{e}$ for the first time and the branching fractions with improved precision. A four-dimensional unbinned maximum likelihood fit determines the form factor ratios to be $V(0)/{A}_{1}(0)=1.48\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.05$ and ${A}_{2}(0)/{A}_{1}(0)=0.83\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.04$. Assuming Cabibbo-Kobayashi-Maskawa unitarity, the known $D$ meson lifetimes, and our measured branching fractions we obtain the form factor normalizations ${A}_{1}(0)$, ${A}_{2}(0)$, and $V(0)$. We also present a measurement of the branching fraction for ${D}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{e}^{+}{\ensuremath{\nu}}_{e}$ with improved precision.
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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 | 0.011 | 0.008 |
| Meta-epidemiology (narrow) | 0.008 | 0.014 |
| Meta-epidemiology (broad) | 0.004 | 0.015 |
| Bibliometrics | 0.004 | 0.009 |
| Science and technology studies | 0.013 | 0.011 |
| Scholarly communication | 0.012 | 0.010 |
| Open science | 0.017 | 0.014 |
| Research integrity | 0.012 | 0.014 |
| Insufficient payload (model declined to judge) | 0.222 | 0.014 |
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; both teacher heads agree on what is shown here.
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".