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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2411.13497 |
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| _version_ | 1866908685121355776 |
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| author | Delzanno, Filippo Fuyuto, Kaori Gonzàlez-Solís, Sergi Mereghetti, Emanuele |
| author_facet | Delzanno, Filippo Fuyuto, Kaori Gonzàlez-Solís, Sergi Mereghetti, Emanuele |
| contents | We study current experimental bounds on charged lepton flavor violating (CLFV) $μ$-$e$ interactions in the model-independent framework of the Standard Model Effective Field Theory (SMEFT). Assuming a generic flavor structure in the quark sector, we consider the contributions of CLFV operators to low-energy observables, including $μ\to eγ$ and $μ\to e$ conversion for quark-flavor conserving operators and CLFV meson decays for quark-flavor violating operators. At high energy, we consider limits on CLFV decays of the Higgs and Z bosons and of the top quark, and obtain bounds on operators with light quarks by recasting searches for production of $eμ$ pairs in $pp$ collisions at the Large Hadron Collider (LHC). We connect observables at low- and high-energy by taking into account renormalization group running and matching between CLFV operators. We also discuss the sensitivity of the future Electron-Ion Collider, where the prospective bounds are derived by imposing simple cuts on final state particles. We find that, in a single operator scenario, bounds on purely leptonic operators are dominated by $μ\rightarrow e γ$ and $μ\rightarrow e$ conversion. Semileptonic operators with down-type quarks are also dominantly constrained by low-energy observables, while LHC searches lead the bounds on up-type quark-flavor violating operators. Taking simplified multiple-coupling scenarios, we show that it is easy to evade the strongest low-energy bounds from spin-independent $μ\rightarrow e$ conversion, and that collider searches are competitive and complementary to constraints from spin-dependent $μ\rightarrow e$ conversion and other low-energy probes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_13497 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Global analysis of $μ\to e$ interactions in the SMEFT Delzanno, Filippo Fuyuto, Kaori Gonzàlez-Solís, Sergi Mereghetti, Emanuele High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory We study current experimental bounds on charged lepton flavor violating (CLFV) $μ$-$e$ interactions in the model-independent framework of the Standard Model Effective Field Theory (SMEFT). Assuming a generic flavor structure in the quark sector, we consider the contributions of CLFV operators to low-energy observables, including $μ\to eγ$ and $μ\to e$ conversion for quark-flavor conserving operators and CLFV meson decays for quark-flavor violating operators. At high energy, we consider limits on CLFV decays of the Higgs and Z bosons and of the top quark, and obtain bounds on operators with light quarks by recasting searches for production of $eμ$ pairs in $pp$ collisions at the Large Hadron Collider (LHC). We connect observables at low- and high-energy by taking into account renormalization group running and matching between CLFV operators. We also discuss the sensitivity of the future Electron-Ion Collider, where the prospective bounds are derived by imposing simple cuts on final state particles. We find that, in a single operator scenario, bounds on purely leptonic operators are dominated by $μ\rightarrow e γ$ and $μ\rightarrow e$ conversion. Semileptonic operators with down-type quarks are also dominantly constrained by low-energy observables, while LHC searches lead the bounds on up-type quark-flavor violating operators. Taking simplified multiple-coupling scenarios, we show that it is easy to evade the strongest low-energy bounds from spin-independent $μ\rightarrow e$ conversion, and that collider searches are competitive and complementary to constraints from spin-dependent $μ\rightarrow e$ conversion and other low-energy probes. |
| title | Global analysis of $μ\to e$ interactions in the SMEFT |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2411.13497 |