ALP contribution to the Strong CP problem
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866916456441053184 |
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| author | Enguita, Victor Gavela, Belen Grinstein, Benjamin Quilez, Pablo |
| author_facet | Enguita, Victor Gavela, Belen Grinstein, Benjamin Quilez, Pablo |
| contents | We compute the one-loop contribution to the $\barθ$-parameter of an axion-like particle (ALP) with CP-odd derivative couplings. Its contribution to the neutron electric dipole moment is shown to be orders of magnitude larger than that stemming from the one-loop ALP contributions to the up- and down-quark electric and chromoelectric dipole moments. This strongly improves existing bounds on ALP-fermion CP-odd interactions, and also sets limits on previously unconstrained couplings. The case of a general singlet scalar is analyzed as well. In addition, we explore how the bounds are modified in the presence of a Peccei-Quinn symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_12133 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | ALP contribution to the Strong CP problem Enguita, Victor Gavela, Belen Grinstein, Benjamin Quilez, Pablo High Energy Physics - Phenomenology We compute the one-loop contribution to the $\barθ$-parameter of an axion-like particle (ALP) with CP-odd derivative couplings. Its contribution to the neutron electric dipole moment is shown to be orders of magnitude larger than that stemming from the one-loop ALP contributions to the up- and down-quark electric and chromoelectric dipole moments. This strongly improves existing bounds on ALP-fermion CP-odd interactions, and also sets limits on previously unconstrained couplings. The case of a general singlet scalar is analyzed as well. In addition, we explore how the bounds are modified in the presence of a Peccei-Quinn symmetry. |
| title | ALP contribution to the Strong CP problem |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2403.12133 |