Probing Lepton Flavor Violation at Linear Electron-Positron Colliders
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918023513767936 |
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| author | Altmannshofer, Wolfgang Munbodh, Pankaj |
| author_facet | Altmannshofer, Wolfgang Munbodh, Pankaj |
| contents | The production of $τμ$ pairs in electron-positron collisions offers a powerful probe of lepton flavor violation. In this work, we calculate the $e^+ e^- \to τμ$ cross section within the framework of the Standard Model Effective Field Theory, allowing for arbitrary $e^+e^-$ beam polarizations. We then estimate the sensitivities of proposed future linear colliders, ILC and CLIC, to effective lepton flavor-violating interactions. The high center-of-mass energies achievable at these machines provide particularly strong sensitivity to four-fermion operators. Furthermore, the polarization of the $e^+e^-$ beams enables novel tests of the chirality structure of these interactions. We find that our projected sensitivities not only complement but in certain scenarios surpass those achievable with low-energy tau decay measurements at Belle~II. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_11653 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Lepton Flavor Violation at Linear Electron-Positron Colliders Altmannshofer, Wolfgang Munbodh, Pankaj High Energy Physics - Phenomenology The production of $τμ$ pairs in electron-positron collisions offers a powerful probe of lepton flavor violation. In this work, we calculate the $e^+ e^- \to τμ$ cross section within the framework of the Standard Model Effective Field Theory, allowing for arbitrary $e^+e^-$ beam polarizations. We then estimate the sensitivities of proposed future linear colliders, ILC and CLIC, to effective lepton flavor-violating interactions. The high center-of-mass energies achievable at these machines provide particularly strong sensitivity to four-fermion operators. Furthermore, the polarization of the $e^+e^-$ beams enables novel tests of the chirality structure of these interactions. We find that our projected sensitivities not only complement but in certain scenarios surpass those achievable with low-energy tau decay measurements at Belle~II. |
| title | Probing Lepton Flavor Violation at Linear Electron-Positron Colliders |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.11653 |