When CP requires $\barθ=0$, not $\barθ=π$
Fuente:
arXiv
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| Autor principal: | |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866908451343433728 |
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| author | Vecchi, Luca |
| author_facet | Vecchi, Luca |
| contents | Imposing CP or P forces the QCD topological angle to be either $\barθ=0$ or $\barθ=π$. However, only the former is phenomenologically viable. This implies that the assumption of CP or P alone cannot provide a framework for unambiguously solving the Strong CP problem. We show that $\barθ=0$ is naturally selected when the assumption of CP is combined with the hypothesis that the Standard Model is embedded in a suitable gauge group. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_10680 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | When CP requires $\barθ=0$, not $\barθ=π$ Vecchi, Luca High Energy Physics - Phenomenology High Energy Physics - Theory Imposing CP or P forces the QCD topological angle to be either $\barθ=0$ or $\barθ=π$. However, only the former is phenomenologically viable. This implies that the assumption of CP or P alone cannot provide a framework for unambiguously solving the Strong CP problem. We show that $\barθ=0$ is naturally selected when the assumption of CP is combined with the hypothesis that the Standard Model is embedded in a suitable gauge group. |
| title | When CP requires $\barθ=0$, not $\barθ=π$ |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2507.10680 |