格点量子色动力学中\(h_c\)介子的辐射衰变
Radiative decays of the $h_c$ meson from lattice QCD
浏览论文内容
中文总结 AI 辅助
首次在格点量子色动力学中研究\(h_c\)介子到\(\gamma \eta\)和\(\gamma \eta'\)的辐射衰变，采用新技术处理激发态\(h_c\)并分离形状因子，计算衰变率并发现与实验有类似抑制，其形状因子影响未测的Dalitz衰变。
中文摘要 AI 辅助
我们首次在格点量子色动力学中研究\(J^{PC}=1^{+-}\)粲偶素态\(h_c\)到\(\gamma \eta\)和\(\gamma \eta'\)的辐射衰变。这项工作在之前对\(J/\psi\)到相同末态衰变计算的基础上展开，采用新技术来处理处于激发态的\(h_c\)并分离独立的电偶极和纵向形状因子。在三味格点上计算得到的辐射衰变率结果显示相对于实验有抑制，与之前\(J/\psi \to \gamma \eta^{(\prime)}\)计算中观察到的类似。两个形状因子的类时\(Q^2\)依赖性共同影响尚未被实验测量的\(h_c \to \ell^+ \ell^- \eta^{(\prime)}\)的Dalitz衰变。
英文摘要
We explore, for the first time in lattice QCD, the radiative decays to $γη$ and $γη'$ of the $J^{PC}=1^{+-}$ charmonium state, $h_c$. This work expands upon a previous calculation of $J/ψ$ decays to the same final states, incorporating novel technology to access the $h_c$ where it is an excited state and to separate the independent electric dipole and longitudinal form--factors. Results for the radiative decay rates, computed on three-flavor lattices with $m_π\sim $ 391 MeV show a suppression relative to experiment that is similar to that observed in the prior calculation of $J/ψ\to γη^{(\prime)}$. The timelike $Q^2$ dependence of both form--factors together influence the Dalitz decays, $h_c \to \ell^+ \ell^- η^{(\prime)}$, which are as yet unmeasured experimentally.
