论文标题
搜索$η$ MESIC $^3 $ HE在$ pd \ rightarrow dpπ^{0} $与wasa-at-at-cosy设施的反应
Search for the $η$ mesic $^3$He in the $pd\rightarrow d p π^{0}$ reaction with the WASA-at-COSY facility
论文作者
论文摘要
$ pd \ rightarrow $ $ dpπ^{0} $反应的激发功能是通过wasa-at-at-cosy实验测量的，目的是搜索$^{3} \ hSpace {-0.03cm} \ hspace {-0.03cm} \ mbox {he} $ - $ hum $ n $η$η$ n $ mesic nuclei。在附近的$η$ Meson生产的测量是使用坡道质子梁进行的。进行数据分析和解释是为了假设$η$ - 米斯氦通过形成中间n $^{*} $（1535）共振而衰减。在激发函数中未观察到$η$ - 墨西核的直接信号。我们确定了$ pd \ rightarrow $ $ $（^{3} \ hspace {-0.03cm} \ mbox {he} $ - $η）_ {bundArw} \ rightArrow $ $ $ dpπ^{0} $。它的边界状态在13 nb至24 nb之间，宽度在$γ\（5,50）$ MEV范围内。
The excitation function for the $pd\rightarrow$ $d p π^{0}$ reaction has been measured by WASA-at-COSY experiment with the aim of searching for $^{3}\hspace{-0.03cm}\mbox{He}$-$η$ mesic nuclei. The measurement in the vicinity of $η$ meson production was performed using a ramped proton beam. The data analysis and interpretation was carried out with the assumption that the $η$-mesic Helium decays via the formation of an intermediate N$^{*}$(1535) resonance. No direct signal of the $η$-mesic nucleus is observed in the excitation function. We determine a new improved upper limit for the total cross section for the bound state production and decay in the $pd\rightarrow$ $(^{3}\hspace{-0.03cm}\mbox{He}$-$η)_{bound} \rightarrow$ $d p π^{0}$ process. It varies between 13 nb to 24 nb for the bound state with width in the range $Γ\in (5,50)$ MeV.
