Left-Handed Physics is not right for EDMs
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918104401969152 |
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| author | Ardu, Marco Davidson, Sacha Valori, Nicola |
| author_facet | Ardu, Marco Davidson, Sacha Valori, Nicola |
| contents | Heavy New Physics models with lepton flavour-changing interactions are motivated by neutrino masses, and generically induce dipole interactions for leptons, which can be flavour-changing ($l_j\to l_i γ$) or flavour-diagonal (magnetic and electric dipole moments(edms)). We focus on models with complex couplings, and where the singlet Standard Model leptons ($\{e_R^i\}$) do not interact with the New Physics. In such models, edms are calculated to arise at two loops, despite that complex amplitudes for $l_j\to l_i γ$ appear at one loop. We explore whether the extra loop suppression of edms survives flavour basis rotations that could be induced by flavour-changing NP contributions to the charged lepton mass matrix. We show that one-loop edms vanish in both the mass and Yukawa eigenstate bases. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_19421 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Left-Handed Physics is not right for EDMs Ardu, Marco Davidson, Sacha Valori, Nicola High Energy Physics - Phenomenology Heavy New Physics models with lepton flavour-changing interactions are motivated by neutrino masses, and generically induce dipole interactions for leptons, which can be flavour-changing ($l_j\to l_i γ$) or flavour-diagonal (magnetic and electric dipole moments(edms)). We focus on models with complex couplings, and where the singlet Standard Model leptons ($\{e_R^i\}$) do not interact with the New Physics. In such models, edms are calculated to arise at two loops, despite that complex amplitudes for $l_j\to l_i γ$ appear at one loop. We explore whether the extra loop suppression of edms survives flavour basis rotations that could be induced by flavour-changing NP contributions to the charged lepton mass matrix. We show that one-loop edms vanish in both the mass and Yukawa eigenstate bases. |
| title | Left-Handed Physics is not right for EDMs |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.19421 |