Search for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4430</mml:mn><mml:msup><mml:mo stretchy="false">)</mml:mo><mml:mo>−</mml:mo></mml:msup></mml:math>at<i>BABAR</i>
Bibliographic record
Abstract
We report the results of a search for $Z(4430{)}^{\ensuremath{-}}$ decay to $J/\ensuremath{\psi}{\ensuremath{\pi}}^{\ensuremath{-}}$ or $\ensuremath{\psi}(2S){\ensuremath{\pi}}^{\ensuremath{-}}$ in ${B}^{\ensuremath{-},0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{\ensuremath{-}}{K}^{0,+}$ and ${B}^{\ensuremath{-},0}\ensuremath{\rightarrow}\ensuremath{\psi}(2S){\ensuremath{\pi}}^{\ensuremath{-}}{K}^{0,+}$ decays. The data were collected with the BABAR detector at the SLAC PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider operating at center-of-mass energy 10.58 GeV, and the sample corresponds to an integrated luminosity of $413\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. Each $K{\ensuremath{\pi}}^{\ensuremath{-}}$ mass distribution exhibits clear ${K}^{*}(892)$ and ${K}_{2}^{*}(1430)$ signals, and the efficiency-corrected spectrum is well described by a superposition of the associated Breit-Wigner intensity distributions, together with an $S$-wave contribution obtained from the LASS $I=1/2$ $K{\ensuremath{\pi}}^{\ensuremath{-}}$ scattering amplitude measurements. Each $K{\ensuremath{\pi}}^{\ensuremath{-}}$ angular distribution varies significantly in structure with $K{\ensuremath{\pi}}^{\ensuremath{-}}$ mass, and is represented in terms of low-order Legendre polynomial moments. We find that each $J/\ensuremath{\psi}{\ensuremath{\pi}}^{\ensuremath{-}}$ or $\ensuremath{\psi}(2S){\ensuremath{\pi}}^{\ensuremath{-}}$ mass distribution is well described by the reflection of the measured $K{\ensuremath{\pi}}^{\ensuremath{-}}$ mass and angular distribution structures. We see no significant evidence for a $Z(4430{)}^{\ensuremath{-}}$ signal for any of the processes investigated, neither in the total $J/\ensuremath{\psi}{\ensuremath{\pi}}^{\ensuremath{-}}$ or $\ensuremath{\psi}(2S){\ensuremath{\pi}}^{\ensuremath{-}}$ mass distribution, nor in the corresponding distributions for the regions of $K{\ensuremath{\pi}}^{\ensuremath{-}}$ mass for which observation of the $Z(4430{)}^{\ensuremath{-}}$ signal was reported. We obtain branching-fraction upper limits $\mathcal{B}({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{Z}^{\ensuremath{-}}{\overline{K}}^{0},{Z}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{\ensuremath{-}})<1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{Z}^{\ensuremath{-}}{K}^{+},{Z}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{\ensuremath{-}})<0.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, $\mathcal{B}({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{Z}^{\ensuremath{-}}{\overline{K}}^{0},{Z}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\psi}(2S){\ensuremath{\pi}}^{\ensuremath{-}})<4.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{Z}^{\ensuremath{-}}{K}^{+},{Z}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\psi}(2S){\ensuremath{\pi}}^{\ensuremath{-}})<3.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ at 95% confidence level, where the $Z(4430{)}^{\ensuremath{-}}$ mass and width have been fixed to the reported central values.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.124 | 0.081 |
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".