Decay of the rho and a1 mesons on the lattice using distillation
Bibliographic record
Abstract
We extract the P-wave ππ phase shift for five values of pion relative momenta, which gives information on the ρ resonance.The Breit-Wigner formula describes the ππ phase shift dependence nicely and we extract m ρ = 792(7)(8) MeV and the coupling g ρππ = 5.13(20) at our m π = 266 MeV.We extract the P-wave scattering length a ππ l=1 = 0.082(10)(3) fm 3 from the state with the lowest pion relative momenta.We also determine the S-wave ρπ phase shift for two values of relative momenta, which provides parameters of the lowest axial resonance a 1 (1260).Using the Breit-Wigner fit we extract m a1 = 1.44(4)GeV and the coupling g a 1 ρπ = 1.1(3)GeV.From the lowest state we also extract the ρπ scattering length a ρπ l=0 = 0.23(12) fm for our m π .The simulation is performed using one N f = 2 ensemble of gauge configurations with cloverimproved Wilson quarks.The phase shifts are determined from the lowest two energy-levels, which are obtained by the variational analysis with a number of quark-antiquark and mesonmeson interpolators.The correlation functions are calculated using the distillation method with the Laplacian Heaviside (LapH) smearing of quarks.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 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".