标题： 矢量夸克环状物的希格斯辐射衰变的二环QCD修正 显示英文标题

标题： Two-loop QCD corrections to Higgs radiative decay to vector quarkonium

摘要： 通过希格斯玻色子辐射衰变产生$J/\psi$可能是一个干净的通道，用于提取魅夸克的雅可比耦合。 我们使用优化的非相对论量子色动力学（NRQCD）方法计算$H\rightarrow J/\psi(\Upsilon)+\gamma$的两环QCD修正。 我们计算直接通道中的 ${\cal O}(\alpha_s^2)$ 校正，其中希格斯粒子直接耦合到 $c\bar{c}$，以及间接通道中的 ${\cal O}(\alpha_s)$ 校正， {\it 例如}，$H\to\gamma^*\gamma$ 然后是虚光子碎片化 into $J/\psi$。 考虑到直接通道和间接通道之间的破坏性干涉，我们迄今为止对希格斯玻色子辐射衰变到矢量夸克结合态，$\mathcal{B}(H\rightarrow J/\psi+\gamma) = 3.27_{-0.07}^{+0.30}{}^{+0.06}_{-0.06}{}_{-0.13}^{+0.13}\times 10^{-6}$和$\mathcal{B}(H\rightarrow \Upsilon+\gamma)= 1.34_{-0.31}^{+0.75}{}^{+0.25}_{-0.20}{}^{+0.05}_{-0.05}\times 10^{-8}$的预测最为准确。 显示英文摘要

摘要： The exclusive production of $J/\psi$ through Higgs boson radiative decay may serve a clean channel to extracting the charm quark Yukawa coupling. We calculate the two-loop QCD corrections to $H\rightarrow J/\psi(\Upsilon)+\gamma$ using an optimized nonrelativistic QCD (NRQCD) approach. We compute the ${\cal O}(\alpha_s^2)$ correction in the direct channel, where Higgs directly couples to $c\bar{c}$, as well as the ${\cal O}(\alpha_s)$ correction in the indirect channel, {\it viz.}, $H\to\gamma^*\gamma$ followed by the virtual photon fragmentation into $J/\psi$. Incorporating the destructive interference between the direct and indirect channels, we present to date the most accurate predictions for Higgs boson radiative decay into vector quarkonium, $\mathcal{B}(H\rightarrow J/\psi+\gamma) = 3.27_{-0.07}^{+0.30}{}^{+0.06}_{-0.06}{}_{-0.13}^{+0.13}\times 10^{-6}$, and $\mathcal{B}(H\rightarrow \Upsilon+\gamma)= 1.34_{-0.31}^{+0.75}{}^{+0.25}_{-0.20}{}^{+0.05}_{-0.05}\times 10^{-8}$.