QCD sum rule study on the charmonium-like states with the exotic quantum number $J^{PC} = 3^{-+}$
Bibliographic record
Abstract
We investigate charmonium-like tetraquark states with the exotic quantum number \( J^{PC} = 3^{-+} \) using QCD sum rules, and obtain the mass of the lowest-lying state to be \( 4.49^{+0.45}_{-0.41} \)~GeV. The construction of relevant tetraquark currents necessitates the explicit introduction of the covariant derivative operator. Our systematic analysis of these interpolating currents reveals the following decay properties: (a) the state readily decays into the \( P \)-wave channels \( [\rho J/\psi] \) and \( [\omega J/\psi] \), but not into the \( [\rho \chi_{c2}] \), \( [\omega \chi_{c2}] \), or \( [J/\psi f_2(1270)] \) channels; and (b) it also decays readily into the \( [D^* \bar{D}_2^*] \) channel, but not into the \( P \)-wave \( [D^* \bar{D}^*] \) channel.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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 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".