从飞行中$K^-$与氦-3反应的半包前向中子能谱中寻找深度束缚态$K^-pp$
Search for the deeply bound $K^-pp$ state from the semi-inclusive forward-neutron spectrum in the in-flight $K^-$ reaction on helium-3
摘要：
在J-PARC强子实验设备中，使用1 GeV/ $c$的5.3 $\times$ $10^9$ K介子，通过飞行中的$^3$ He（$K^-,n)$）反应进行了搜索$K^-pp$结合态的实验。在$θ_{n}^{lab}=0^\circ$的半包容中子丢失质谱中，在对应于$K^-pp$结合能大于80 MeV的区域中没有观察到显著的峰，其中在不同反应中的$Λp$终态中已经报道了凸起结构。假设状态各向同性衰变为$Λp$，在95%置信水平下，对于20、60和100 MeV的自然宽度，产生截面上与质量有关的上限分别确定为30- 180、70- 250和100- 270 $μ$ b/sr。
英文摘要：
An experiment to search for the $K^-pp$ bound state was performed via the in-flight $^3$He($K^-,n)$ reaction using 5.3 $\times$ $10^9$ kaons at 1 GeV/$c$ at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at $θ_{n}^{lab}=0^\circ$, no significant peak was observed in the region corresponding to $K^-pp$ binding energy larger than 80 MeV, where a bump structure has been reported in the $Λp$ final state in different reactions. Assuming the state to be isotropically decaying into $Λp$, mass-dependent upper limits on the production cross section were determined to be 30--180, 70--250, and 100--270 $μ$b/sr, for the natural widths of 20, 60, and 100 MeV, respectively, at 95\% confidence level.
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