Distinguishing models with $μ\to e $ observables
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866911759181283328 |
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| author | Ardu, Marco Davidson, Sacha Lavignac, Stéphane |
| author_facet | Ardu, Marco Davidson, Sacha Lavignac, Stéphane |
| contents | Upcoming experiments will improve the reach for the lepton flavour violating (LFV) processes $μ\to e γ$, $μ\to e \bar{e} e$ and $μA \to e A$ by orders of magnitude. We investigate whether this upcoming data could rule out some popular TeV-scale LFV models (the type II seesaw, the inverse seesaw and a scalar leptoquark) using a bottom-up EFT approach involving twelve Wilson coefficients that can in principle all be determined by experimental measurements. In this 12-dimensional coefficient space, each model can only predict points in a specific subspace; for instance, flavour change involving singlet electrons is suppressed in the seesaw models, and the leptoquark induces negligible coefficients for 4-lepton scalar operators. Using the fact that none of these models can populate the whole region accessible to upcoming experiments, we show that $μ\to e$ experiments have the ability to rule them out. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_16897 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Distinguishing models with $μ\to e $ observables Ardu, Marco Davidson, Sacha Lavignac, Stéphane High Energy Physics - Phenomenology Upcoming experiments will improve the reach for the lepton flavour violating (LFV) processes $μ\to e γ$, $μ\to e \bar{e} e$ and $μA \to e A$ by orders of magnitude. We investigate whether this upcoming data could rule out some popular TeV-scale LFV models (the type II seesaw, the inverse seesaw and a scalar leptoquark) using a bottom-up EFT approach involving twelve Wilson coefficients that can in principle all be determined by experimental measurements. In this 12-dimensional coefficient space, each model can only predict points in a specific subspace; for instance, flavour change involving singlet electrons is suppressed in the seesaw models, and the leptoquark induces negligible coefficients for 4-lepton scalar operators. Using the fact that none of these models can populate the whole region accessible to upcoming experiments, we show that $μ\to e$ experiments have the ability to rule them out. |
| title | Distinguishing models with $μ\to e $ observables |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2308.16897 |