$f_K/f_π$ in iso-symmetric QCD and the CKM matrix unitarity
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| Format: | Preprint |
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2025
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| _version_ | 1866914536003469312 |
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| author | Conigli, Alessandro Frison, Julien Sáez, Alejandro |
| author_facet | Conigli, Alessandro Frison, Julien Sáez, Alejandro |
| contents | We present lattice results for $f_K/f_π$ in the iso-symmetric limit of pure QCD (isoQCD) with $N_f=2+1$ flavours, along with a determination of $|V_{us}|/|V_{ud}|$ and a study on the unitarity of the first row of the Cabibbo-Kobayashi-Maskawa (CKM) matrix after introducing strong isospin-breaking and QED effects. The results obtained are based on a combination of a Wilson unitary action and the mixed-action setup introduced in arXiv:2309.14154, arXiv:2510.20450. The combination of the two regularisations enables a more precise control over the continuum-limit extrapolation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_19294 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $f_K/f_π$ in iso-symmetric QCD and the CKM matrix unitarity Conigli, Alessandro Frison, Julien Sáez, Alejandro High Energy Physics - Lattice High Energy Physics - Phenomenology We present lattice results for $f_K/f_π$ in the iso-symmetric limit of pure QCD (isoQCD) with $N_f=2+1$ flavours, along with a determination of $|V_{us}|/|V_{ud}|$ and a study on the unitarity of the first row of the Cabibbo-Kobayashi-Maskawa (CKM) matrix after introducing strong isospin-breaking and QED effects. The results obtained are based on a combination of a Wilson unitary action and the mixed-action setup introduced in arXiv:2309.14154, arXiv:2510.20450. The combination of the two regularisations enables a more precise control over the continuum-limit extrapolation. |
| title | $f_K/f_π$ in iso-symmetric QCD and the CKM matrix unitarity |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.19294 |