Heavy-light meson decay constants and hyperfine splittings with the heavy-HISQ method
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912228129636352 |
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| author | Miller, Kerr A. Harrison, Judd Davies, Christine T. H. Smecca, Antonio |
| author_facet | Miller, Kerr A. Harrison, Judd Davies, Christine T. H. Smecca, Antonio |
| contents | We compute ratios between the vector and pseudoscalar, and tensor and vector decay constants, and between hyperfine splittings for $D_{(s)}^{(*)}$ and $B_{(s)}^{(*)}$ mesons. We use the Highly Improved Staggered Quark (HISQ) action for all valence quarks, paired with the second generation MILC $n_f = 2+1+1$ HISQ gluon field configurations. These include light sea quarks with $m_u = m_d \equiv m_l$ going down to the physical values, as well as physically tuned strange and charm sea quarks. We also use a HISQ valence heavy quark, with mass ranging from that of the $c$-quark up to very nearly that of the physical $b$-quark on the finest lattices, allowing us to map out the heavy-quark mass dependence of the decay constant and hyperfine splitting ratios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_06713 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Heavy-light meson decay constants and hyperfine splittings with the heavy-HISQ method Miller, Kerr A. Harrison, Judd Davies, Christine T. H. Smecca, Antonio High Energy Physics - Lattice We compute ratios between the vector and pseudoscalar, and tensor and vector decay constants, and between hyperfine splittings for $D_{(s)}^{(*)}$ and $B_{(s)}^{(*)}$ mesons. We use the Highly Improved Staggered Quark (HISQ) action for all valence quarks, paired with the second generation MILC $n_f = 2+1+1$ HISQ gluon field configurations. These include light sea quarks with $m_u = m_d \equiv m_l$ going down to the physical values, as well as physically tuned strange and charm sea quarks. We also use a HISQ valence heavy quark, with mass ranging from that of the $c$-quark up to very nearly that of the physical $b$-quark on the finest lattices, allowing us to map out the heavy-quark mass dependence of the decay constant and hyperfine splitting ratios. |
| title | Heavy-light meson decay constants and hyperfine splittings with the heavy-HISQ method |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2502.06713 |