Observable detail · PARTICLE
δ_CP
leptonic CP-violating phase
| Prediction | π/3 = 60° |
|---|---|
| Measured | 65.5° |
| Residual | 5.5° / 3.6σ |
| Status | soft |
| Source paper | DCT-SM-01 · 10.5281/zenodo.20032825 |
Mechanism
Polytope ansatz δ_CP = π/3 from the Z_3 coset structure of the 600-cell vertex set. SM leading-log running 7°–12° from the unification scale to the experimental scale brackets the 5.5° residual.
Derivation
Polytope ansatz δ_CP = π/3 from the Z_3 coset structure of the 600-cell vertex set. SM leading-log running 7°–12° from the unification scale to the experimental scale brackets the 5.5° residual.
The closed-form prediction is
$$ \text{predicted} = π/3 = 60° $$against the measurement 65.5°, giving residual 5.5° / 3.6σ.
Python verification
The verification script for this observable is delta_CP_loop_running.py. Run it with python3 delta_CP_loop_running.py to reproduce the canonical DCT result against the public-archive measurement source listed above (T2K + NOvA combined (2024); PDG 2024.).
References
- PDG 2024
- T2K Collaboration 2024
- Source paper: DCT-SM-01 · 10.5281/zenodo.20032825
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