基于非微扰调优重夸克作用量的连续谱中的奇特$B_s$介子
Exotic $B_s$ mesons in the continuum from a nonperturbatively-tuned heavy quark action
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中文总结 AI 辅助
本研究采用经神经网络非微扰调优的相对论重夸克作用量，通过格点量子色动力学预测$B_{s0}^*$和$B_{s1}$的结合能，证明其在连续谱极限下仍为深束缚态，并经基准检验获得精确结果。
中文摘要 AI 辅助
本研究利用格点量子色动力学（Lattice QCD）预测了两类$B_s$奇特介子候选态$B_{s0}^*$和$B_{s1}$的质量与结合能。模拟中采用了用于价b夸克的相对论重夸克作用量，该作用量通过神经网络进行了完全非微扰调优，这使得研究人员能够取连续谱极限，并消除了此前利用格点非相对论量子色动力学（Lattice-NRQCD）确定这些态时存在的最大系统误差。本研究是首个通过格点量子色动力学研究证明这些态在连续谱极限下仍处于深束缚态的工作。研究人员通过重现$B$和$B_s$介子的1S超精细分裂实验值，以及$B$与$B_s$介子之间的质量分裂，对所采用的重夸克方法进行了全面基准检验。最终结果显示，$B_{s0}^*$相对于$BK$阈值的结合能为$-65.9(6.0)(3.0)_\text{Iso}$ MeV，$B_{s1}$相对于$B^*K$阈值的结合能为$-60.6(6.6)(3.0)_\text{Iso}(1.0)_\text{GEVP}$ MeV。
英文摘要
In this work we predict the masses and binding energies of two $B_s$ exotic-meson candidates using Lattice QCD, namely the $B_{s0}^*$ and $B_{s1}$. We use a relativistic heavy-quark action for the valence b-quark in our simulations, tuned fully non-perturbatively by a neural network. This allows us to take the continuum limit and eliminates the largest systematic we attributed to our previous determination of these states using Lattice-NRQCD. This is the first Lattice QCD study to show that these states remain deeply bound in the continuum limit. We thoroughly benchmark our heavy-quark approach by reproducing the experimental values of the 1S hyperfine splittings of $B$ and $B_s$ mesons, as well as the mass splitting between the $B$ and $B_s$ mesons. Our final results yield binding energies with respect to the $BK$ and $B^*K$ thresholds of $-65.9(6.0)(3.0)_\text{Iso}$ MeV and $-60.6(6.6)(3.0)_\text{Iso}(1.0)_\text{GEVP}$ MeV for the $B_{s0}^*$ and $B_{s1}$ respectively.
