$S^\prime_4$ Quark Flavour Model in the Vicinity of the Fixed Point $τ= i\infty$
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arXiv
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| Format: | Preprint |
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2026
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| author | Petcov, S. T. Tanimoto, M. |
| author_facet | Petcov, S. T. Tanimoto, M. |
| contents | We study in the bottom-up framework the possibility to generate the quark mass hierarchies without fine-tuning, the quark mixing and CP-violation (CPV) in a flavour model with $S^\prime_4$ modular symmetry having minimal number of parameters. The model is considered in the vicinity of the fixed point $τ_\text{T}= i\infty$, $τ_\text{vev} \sim τ_\text{T}$, $τ_\text{vev}$ being the vacuum expectation value (VEV) of the modulus $τ$, which allows to explain the hierarchies of the quark masses. The ten quark observables are described by nine real parameters. The CP-symmetry is broken explicitly since, as is well known, reproducing the observed CPV in the quark sector in the case of spontaneous breaking of CP-symmetry by $τ_\text{vev}$ is highly problematic in the class of minimal modular quark flavour models (explaining the quark mass hierarchies without fine-tuning) of the type we consider. We perform a statistical analysis of the model and show that it is phenomenologically viable and consistent, in particular, with the ``inclusive'' decay data on the $|V_{ub}|$ and $|V_{cb}|$ elements of the CKM matrix and, in the case of a very high scale of supersymmetry breaking, with the current ``average'' experimental values of $|V_{ub}|$ and $|V_{cb}|$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_04529 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | $S^\prime_4$ Quark Flavour Model in the Vicinity of the Fixed Point $τ= i\infty$ Petcov, S. T. Tanimoto, M. High Energy Physics - Phenomenology High Energy Physics - Theory We study in the bottom-up framework the possibility to generate the quark mass hierarchies without fine-tuning, the quark mixing and CP-violation (CPV) in a flavour model with $S^\prime_4$ modular symmetry having minimal number of parameters. The model is considered in the vicinity of the fixed point $τ_\text{T}= i\infty$, $τ_\text{vev} \sim τ_\text{T}$, $τ_\text{vev}$ being the vacuum expectation value (VEV) of the modulus $τ$, which allows to explain the hierarchies of the quark masses. The ten quark observables are described by nine real parameters. The CP-symmetry is broken explicitly since, as is well known, reproducing the observed CPV in the quark sector in the case of spontaneous breaking of CP-symmetry by $τ_\text{vev}$ is highly problematic in the class of minimal modular quark flavour models (explaining the quark mass hierarchies without fine-tuning) of the type we consider. We perform a statistical analysis of the model and show that it is phenomenologically viable and consistent, in particular, with the ``inclusive'' decay data on the $|V_{ub}|$ and $|V_{cb}|$ elements of the CKM matrix and, in the case of a very high scale of supersymmetry breaking, with the current ``average'' experimental values of $|V_{ub}|$ and $|V_{cb}|$. |
| title | $S^\prime_4$ Quark Flavour Model in the Vicinity of the Fixed Point $τ= i\infty$ |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2601.04529 |