The Standard Model partial unification scale as a guide to new physics model building
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arXiv
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| Natura: | Preprint |
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2025
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| _version_ | 1866918426936606720 |
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| author | Masina, Isabella Quiros, Mariano |
| author_facet | Masina, Isabella Quiros, Mariano |
| contents | In the Standard Model, partial unification of the non-Abelian running gauge couplings is achieved at the scale $μ^{SM}_{32} \approx 2.8 \times 10^{16}$ GeV. Elaborating on this fact, we discuss a simple general parametrization for the new physics corrections leading to full unification at some scale $M_X$. We show that for any new physics model such that the corrections to the non-Abelian couplings are equal (or nearly so), $M_X$ is equal (or close to) the partial unification scale $μ^{SM}_{32}$; the latter scales could be disentangled only if the corrections to the non-Abelian couplings are significantly different. We explore how the parametrization works for some relevant models with new physics below $M_X$, as low energy supersymmetry, split supersymmetry, etc. As for models with a desert up to $M_X$, we explore in particular how the parametrization works for string inspired corrections; we find a phenomenologically remarkable possibility for unification at about 100 TeV, suggesting a low string scale, in addition to the more conservative possibility for unification at $μ^{SM}_{32}$; for models with power-low running/threshold corrections, we also outline an interesting connection with the number of fermion families propagating in the bulk. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_21420 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Standard Model partial unification scale as a guide to new physics model building Masina, Isabella Quiros, Mariano High Energy Physics - Phenomenology High Energy Physics - Theory In the Standard Model, partial unification of the non-Abelian running gauge couplings is achieved at the scale $μ^{SM}_{32} \approx 2.8 \times 10^{16}$ GeV. Elaborating on this fact, we discuss a simple general parametrization for the new physics corrections leading to full unification at some scale $M_X$. We show that for any new physics model such that the corrections to the non-Abelian couplings are equal (or nearly so), $M_X$ is equal (or close to) the partial unification scale $μ^{SM}_{32}$; the latter scales could be disentangled only if the corrections to the non-Abelian couplings are significantly different. We explore how the parametrization works for some relevant models with new physics below $M_X$, as low energy supersymmetry, split supersymmetry, etc. As for models with a desert up to $M_X$, we explore in particular how the parametrization works for string inspired corrections; we find a phenomenologically remarkable possibility for unification at about 100 TeV, suggesting a low string scale, in addition to the more conservative possibility for unification at $μ^{SM}_{32}$; for models with power-low running/threshold corrections, we also outline an interesting connection with the number of fermion families propagating in the bulk. |
| title | The Standard Model partial unification scale as a guide to new physics model building |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2510.21420 |