论文标题
搜索$ k_l^0 \ to xx $，$ x \toγγ$的深色粒子的生产$ x $ $ x $
Search for the Pair Production of Dark Particles $X$ with $K_L^0 \to XX$, $X \to γγ$
论文作者
论文摘要
我们首次使用$ k_l^0 \ to xx $的黑暗粒子$ x $ $ x $的搜索，并使用Koto实验收集的数据将$ x $衰减到两个光子中。在40-110 mev/c $^2 $和210-240 MEV/C $^2 $的质量范围内未观察到信号。 This sets upper limits on the branching fractions as $\mathcal{B}(K_L^0 \to XX)$ $<$ (1-4) $\times$ 10$^{-7}$ and $\mathcal{B}(K_L^0 \to XX)$ $<$ (1-2) $\times$ 10$^{-6}$ at the 90% confidence level for the two群众区域分别。
We present the first search for the pair production of dark particles $X$ via $K_L^0\to XX$ with $X$ decaying into two photons using the data collected by the KOTO experiment. No signal was observed in the mass range of 40 - 110 MeV/c$^2$ and 210 - 240 MeV/c$^2$. This sets upper limits on the branching fractions as $\mathcal{B}(K_L^0 \to XX)$ $<$ (1-4) $\times$ 10$^{-7}$ and $\mathcal{B}(K_L^0 \to XX)$ $<$ (1-2) $\times$ 10$^{-6}$ at the 90% confidence level for the two mass regions, respectively.
