Comparison of the mixed-fermion-action Effects using different fermion and gauge actions with 2+1 and 2+1+1 flavors
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912938091085824 |
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| author | Zhang, Zun-Xian Cai, Mengchu Hu, Bolun Jiang, Xiangyu Meng, Xiao-Lan Yang, Yi-Bo Zhao, Dian-Jun |
| author_facet | Zhang, Zun-Xian Cai, Mengchu Hu, Bolun Jiang, Xiangyu Meng, Xiao-Lan Yang, Yi-Bo Zhao, Dian-Jun |
| contents | The leading-order low-energy constant $Δ_{\rm mix}$ in mixed-action chiral perturbation theory is calculated using $2+1+1$-flavor gauge ensembles with HISQ fermions and a tadpole-improved Symanzik gauge action at four lattice spacings $a \in [0.048, 0.111]$ fm. By comparing our results to those from different actions and a $2+1$-flavor case, We find that the fermion action has the dominant impact, the gauge action has a secondary but measurable effect, and the contribution from charm quark loops is negligible within our current uncertainties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_19265 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Comparison of the mixed-fermion-action Effects using different fermion and gauge actions with 2+1 and 2+1+1 flavors Zhang, Zun-Xian Cai, Mengchu Hu, Bolun Jiang, Xiangyu Meng, Xiao-Lan Yang, Yi-Bo Zhao, Dian-Jun High Energy Physics - Lattice The leading-order low-energy constant $Δ_{\rm mix}$ in mixed-action chiral perturbation theory is calculated using $2+1+1$-flavor gauge ensembles with HISQ fermions and a tadpole-improved Symanzik gauge action at four lattice spacings $a \in [0.048, 0.111]$ fm. By comparing our results to those from different actions and a $2+1$-flavor case, We find that the fermion action has the dominant impact, the gauge action has a secondary but measurable effect, and the contribution from charm quark loops is negligible within our current uncertainties. |
| title | Comparison of the mixed-fermion-action Effects using different fermion and gauge actions with 2+1 and 2+1+1 flavors |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2512.19265 |