Third-Family Quark-Lepton Unification and Electroweak Precision Tests
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| Format: | Preprint |
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2023
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| _version_ | 1866915433582428160 |
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| author | Allwicher, Lukas Isidori, Gino Lizana, Javier M. Selimovic, Nudzeim Stefanek, Ben A. |
| author_facet | Allwicher, Lukas Isidori, Gino Lizana, Javier M. Selimovic, Nudzeim Stefanek, Ben A. |
| contents | We analyze the compatibility of the hypothesis of third-family quark-lepton unification at the TeV scale with electroweak precision data, lepton flavor universality tests, and high-$p_T$ constraints. We work within the framework of the UV complete flavor non-universal 4321 gauge model, which is matched at one loop to the Standard Model Effective Field Theory. For consistency, all electroweak precision observables are also computed at one loop within the effective field theory. At tree level, the most sizeable corrections are to $W\rightarrow τν_τ$ and $Z \to ν_τν_τ$ due to integrating out a pseudo-Dirac singlet fermion required by the model for neutrino mass generation. At loop level, the new colored states of the model generate large flavor-universal contributions to the electroweak precision observables via leading- and next-to-leading log running effects, yielding a significant improvement in the electroweak fit (including an increase in the $W$-boson mass). These effects cannot be decoupled if the model addresses the charged-current $B$-meson anomalies. Overall, we find good compatibility between the data sets, while simultaneously satisfying all low- and high-energy constraints. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2302_11584 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Third-Family Quark-Lepton Unification and Electroweak Precision Tests Allwicher, Lukas Isidori, Gino Lizana, Javier M. Selimovic, Nudzeim Stefanek, Ben A. High Energy Physics - Phenomenology High Energy Physics - Experiment We analyze the compatibility of the hypothesis of third-family quark-lepton unification at the TeV scale with electroweak precision data, lepton flavor universality tests, and high-$p_T$ constraints. We work within the framework of the UV complete flavor non-universal 4321 gauge model, which is matched at one loop to the Standard Model Effective Field Theory. For consistency, all electroweak precision observables are also computed at one loop within the effective field theory. At tree level, the most sizeable corrections are to $W\rightarrow τν_τ$ and $Z \to ν_τν_τ$ due to integrating out a pseudo-Dirac singlet fermion required by the model for neutrino mass generation. At loop level, the new colored states of the model generate large flavor-universal contributions to the electroweak precision observables via leading- and next-to-leading log running effects, yielding a significant improvement in the electroweak fit (including an increase in the $W$-boson mass). These effects cannot be decoupled if the model addresses the charged-current $B$-meson anomalies. Overall, we find good compatibility between the data sets, while simultaneously satisfying all low- and high-energy constraints. |
| title | Third-Family Quark-Lepton Unification and Electroweak Precision Tests |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2302.11584 |