论文标题
Pionium作为$ k \toπν\barν$衰减中的虚假事件的来源
Pionium as a source of false events in the $K\toπν\barν$ decays
论文作者
论文摘要
我们建议，最终状态下具有向锥子和先锋（$π^+π^ - $ atom）的kaons的衰减模式可能构成尚未被视为非常罕见的衰减$ k \toπν\barν$的背景。实际上，先锋的一部分可能在衰减到两个$π^0 $ s之前逃脱衰减区域（在激发率的情况下为$π^0π^0γ$）。为了说明这种背景的重要性，我们表明它甚至可以在某些假设下解释出意外的$ k_l $衰减事件，该事件出现在Koto实验中。
We suggest that the decay modes of kaons with a pion and a pionium ($π^+π^-$ atom) in the final state can constitute a not yet considered background to the very rare decay $K\toπν\barν$. In fact, a part of pioniums may escape the decay region before decaying into two $π^0$s (or to $π^0π^0γ$ in the case of excited pionium). To illustrate the importance of this background, we show that it may even explain, under some assumptions, the unexpected $K_L$ decay events that appeared in the KOTO experiment.
