Continuum-Limit HQET LCDAs from Lattice QCD for Tightening B Decay Uncertainties
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Han, Xue-Ying Gao, Hao-Fei Hua, Jun Ji, Xiangdong Jiang, Xiangyu Lü, Cai-Dian Schäfer, Andreas Tan, Jin-Xin Wang, Ji-Hao Wang, Wei Xu, Ji Yang, Yi-Bo Zhang, Fu-Wei Zhang, Jian-Hui Zhang, Jia-Lu Zhang, Mu-Hua Zhang, Qi-An Zhao, Shuai |
| author_facet | Han, Xue-Ying Gao, Hao-Fei Hua, Jun Ji, Xiangdong Jiang, Xiangyu Lü, Cai-Dian Schäfer, Andreas Tan, Jin-Xin Wang, Ji-Hao Wang, Wei Xu, Ji Yang, Yi-Bo Zhang, Fu-Wei Zhang, Jian-Hui Zhang, Jia-Lu Zhang, Mu-Hua Zhang, Qi-An Zhao, Shuai |
| contents | Heavy meson HQET light-cone distribution amplitudes (LCDAs) are critical for precision predictions of $B$ meson weak decays, but currently are one of dominant theoretical uncertainties that obscure interpretations of $B$ anomalies and CP-violating measurements. Building on the established HQLaMET framework, supplemented by lattice QCD calculations of the OPE moments, we present a precise lattice QCD calculation of HQET LCDAs by employing multi-ensemble simulations for continuum and physical pion mass extrapolation, quantifying comprehensive systematic errors, and validating results through OPE moment cross-validation. Details of the lattice calculations are provided in a companion paper \cite{HeavymesonDA_long_paper}. Our final results for key inverse moments (at $μ=1$ GeV) are $λ_B=0.340(20)$ GeV and $σ_B^{(1)}=1.685(63)$, with the total uncertainty reduced by a factor of three relative to the previous analysis. These results can greatly reduce the uncertainty in the $B \to K^*$ form factors in the large-recoil region. This work resolves the long-standing bottleneck in first-principles predictions of heavy meson LCDAs, advancing precision flavor physics to new frontiers. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_10946 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Continuum-Limit HQET LCDAs from Lattice QCD for Tightening B Decay Uncertainties Han, Xue-Ying Gao, Hao-Fei Hua, Jun Ji, Xiangdong Jiang, Xiangyu Lü, Cai-Dian Schäfer, Andreas Tan, Jin-Xin Wang, Ji-Hao Wang, Wei Xu, Ji Yang, Yi-Bo Zhang, Fu-Wei Zhang, Jian-Hui Zhang, Jia-Lu Zhang, Mu-Hua Zhang, Qi-An Zhao, Shuai High Energy Physics - Lattice High Energy Physics - Phenomenology Heavy meson HQET light-cone distribution amplitudes (LCDAs) are critical for precision predictions of $B$ meson weak decays, but currently are one of dominant theoretical uncertainties that obscure interpretations of $B$ anomalies and CP-violating measurements. Building on the established HQLaMET framework, supplemented by lattice QCD calculations of the OPE moments, we present a precise lattice QCD calculation of HQET LCDAs by employing multi-ensemble simulations for continuum and physical pion mass extrapolation, quantifying comprehensive systematic errors, and validating results through OPE moment cross-validation. Details of the lattice calculations are provided in a companion paper \cite{HeavymesonDA_long_paper}. Our final results for key inverse moments (at $μ=1$ GeV) are $λ_B=0.340(20)$ GeV and $σ_B^{(1)}=1.685(63)$, with the total uncertainty reduced by a factor of three relative to the previous analysis. These results can greatly reduce the uncertainty in the $B \to K^*$ form factors in the large-recoil region. This work resolves the long-standing bottleneck in first-principles predictions of heavy meson LCDAs, advancing precision flavor physics to new frontiers. |
| title | Continuum-Limit HQET LCDAs from Lattice QCD for Tightening B Decay Uncertainties |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.10946 |