Strong C P violation and large- N c spin-flavor symmetry
We revisit the contribution of the QCD θ ¯ term to the C P -violating pion-nucleon couplings and the nucleon electric dipole moment in a combined large- N c and chiral perturbation theory framework. In particular, we approach this issue through the emergent spin-flavor symmetry of the baryon sector...
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| Veröffentlicht in: | Physical review. D Jg. 112; H. 9 |
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| 1. Verfasser: | |
| Format: | Journal Article |
| Sprache: | Englisch |
| Veröffentlicht: |
01.11.2025
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| ISSN: | 2470-0010, 2470-0029 |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | We revisit the contribution of the QCD θ ¯ term to the C P -violating pion-nucleon couplings and the nucleon electric dipole moment in a combined large- N c and chiral perturbation theory framework. In particular, we approach this issue through the emergent spin-flavor symmetry of the baryon sector at large but finite N c . We obtain good agreement with previous analyses for the pion-nucleon couplings and show that the large- N c framework indicates that tree-level contributions to the electric dipole moment possibly play a dominant role. The spin-flavor symmetry also enables us to provide novel constraints on C P -violating pion- Δ couplings, as well as the Δ electric dipole moment and Δ N transition moment. |
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| ISSN: | 2470-0010 2470-0029 |
| DOI: | 10.1103/1jb4-tqpn |