$F_K/F_π$ as a precision test of a new four flavor Domain Wall Fermion action
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910198807920640 |
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| author | Hudspith, Renwick J. Garron, Nicolas Hall, Zack Hanlon, Andrew Monge-Camacho, Henry Morningstar, Colin Nicholson, Amy Pefkou, Dimitra A. Richardson, Thomas R. Romero-López, Fernando Salg, Miguel Smith, Wyatt A. Vranas, Pavlos Walker-Loud, André Wang, Bigeng |
| author_facet | Hudspith, Renwick J. Garron, Nicolas Hall, Zack Hanlon, Andrew Monge-Camacho, Henry Morningstar, Colin Nicholson, Amy Pefkou, Dimitra A. Richardson, Thomas R. Romero-López, Fernando Salg, Miguel Smith, Wyatt A. Vranas, Pavlos Walker-Loud, André Wang, Bigeng |
| contents | We present a new set of lattice QCD ensembles with four flavors of smeared Möbius Domain Wall Fermions with good chiral symmetry and small fifth-dimensional extent. A modest amount of computing resources was sufficient to generate 30 publicly-available ensembles spanning five lattice spacings and a broad range of pion masses down to physical. To scrutinize our action we determine $F_{K^{\pm}}/F_{π^{\pm}} = 1.1962(34)$, a key quantity for precision CKM unitarity tests, heralding a future of inexpensive high-precision calculations of hadronic observables with chiral fermions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_06560 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | $F_K/F_π$ as a precision test of a new four flavor Domain Wall Fermion action Hudspith, Renwick J. Garron, Nicolas Hall, Zack Hanlon, Andrew Monge-Camacho, Henry Morningstar, Colin Nicholson, Amy Pefkou, Dimitra A. Richardson, Thomas R. Romero-López, Fernando Salg, Miguel Smith, Wyatt A. Vranas, Pavlos Walker-Loud, André Wang, Bigeng High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory We present a new set of lattice QCD ensembles with four flavors of smeared Möbius Domain Wall Fermions with good chiral symmetry and small fifth-dimensional extent. A modest amount of computing resources was sufficient to generate 30 publicly-available ensembles spanning five lattice spacings and a broad range of pion masses down to physical. To scrutinize our action we determine $F_{K^{\pm}}/F_{π^{\pm}} = 1.1962(34)$, a key quantity for precision CKM unitarity tests, heralding a future of inexpensive high-precision calculations of hadronic observables with chiral fermions. |
| title | $F_K/F_π$ as a precision test of a new four flavor Domain Wall Fermion action |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2605.06560 |