用GAMS-$4π$装置测量$π^{-}$和$K^{-}$光束中的$η$-PDMATHAAB混合角
Measurement of the $η$ -$η'$ mixing angle in $π^{-}$ and $K^{-}$ beams with GAMS-$4π$ Setup
摘要：
本文给出了用$π^{-}$和$K^{-}$束进行电荷交换反应产生的$η'$、$η$介子的混合角测量结果。当$η'$、$η$介子在非奇异（NS）-奇异（S）夸克基中描述时，$π^{-}$和$K^{-}$光束允许研究介子波函数的$|η_{q}>$和$|η_{s}>$部分。在$π^{-}$束中$t'=0$（GeV/c）$^{2}$处的截面比为$R_π(η'/η)= 0.56 \pm 0.04$，导致混合角$ϕ_{P} = (36.8 \pm 1.)^{o} $。对于$K^{-}$光束，比率为$R_{K}(η'/η)= 1.30 \pm 0.16$。发现$η'$中的胶子含量为$\sin^{2}ψ_{G}= 0.15 \pm 0.06$。实验用GAMS-4 $π$装置进行。
英文摘要：
The results of mixing angle measurement for $η'$, $η$ mesons generated in charge exchange reactions with $π^{-}$ and $K^{-}$ beams are preseneted. When the $η'$, $η$ mesons are described in nonstrange(NS)--strange(S) quark basis the $π^{-}$ and $K^{-}$ beams allow to study $|η_{q}>$ and $|η_{s}>$ parts of the meson wave function. The cross section ratio at $t'=0$ (GeV/c)$^{2}$ in the $π^{-}$ beam is $R_π(η'/η)= 0.56 \pm 0.04$, results in mixing angle $ϕ_{P} = (36.8 \pm 1.)^{o} $. For $K^{-}$ beam the ratio is $R_{K}(η'/η)= 1.30 \pm 0.16$. It was found that gluonium content in $η'$ is $\sin^{2}ψ_{G}= 0.15 \pm 0.06$. The experiment was carried out with GAMS-4$π$ Setup.
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