Exclusive rare Higgs decays into lepton pair plus one light hadron, such as $h\to {\rho }^0(\omega )\ell \overline{\ell }$, $h\to {\pi }^0\ell \overline{\ell }$, $h\to {\pi }^{+}(K^{+}){\ell }^{-}{\overline{\nu }}_{\ell }$, and $h\to {\rho }^{+}(K^{⁎+}){\ell }^{-}{\overline{\nu }}_{\ell }$, have been explored in the standard model. Decay amplitudes are dominantly from the Higgs couplings to gauge bosons and to charged leptons, and their branching ratios are predicted in the range of ${10}^{-8}\sim {10}^{-5}$. We have also analyzed the differential dilepton invariant mass and angular distributions of $h\to {\rho }^0{\ell }^{+}{\ell }^{-}$ decays. It will be challenging to search for these rare processes. Nevertheless, experimental studies of them, in particular, $h\to {\rho }^0{\ell }^{+}{\ell }^{-}$ with $\ell =e,\mu$, might be interesting both to help deepen our understanding of the standard model and to probe new physics beyond the standard model in the future high-precision experiments.

独家稀有的希格斯衰变成轻子对加上一个轻强子，例如 $H\to {\rho }^0（\omega ）\ell \overline{\ell }$， $H\to {\pi }^0\ell \overline{\ell }$， $H\to {\pi }^{+}（{ķ}^{+}）{\ell }^{-}{\overline{\nu }}_{\ell }$， 和 $H\to {\rho }^{+}（{ķ}^{⁎+}）{\ell }^{-}{\overline{\nu }}_{\ell }$，已在标准模型中进行了探讨。衰减幅度主要是从希格斯耦合器到规范玻色子和带电轻子，并且它们的分支比预计在的范围内。${10}^{-8}〜{10}^{-5}$。我们还分析了微分Dilepton不变质量和角分布$H\to {\rho }^0{\ell }^{+}{\ell }^{-}$衰变。寻找这些罕见的过程将具有挑战性。尽管如此，对它们的实验研究尤其如此，$H\to {\rho }^0{\ell }^{+}{\ell }^{-}$ 和 $\ell =Ë，\mu$，这可能有助于我们加深对标准模型的理解，并在将来的高精度实验中探索标准模型之外的新物理现象。