基本双介子聚变中的ABC效应--观察到一种新的共振？
ABC Effect in Basic Double-Pionic Fusion --- Observation of a new resonance?
摘要：
我们报告的高统计测量的基本双介子聚变反应$pn \to dπ^0π^0$在所谓的ABC效应，一个显着的低质量增强的$ππ$不变的质谱的能量区域。使用COSY的WASA检测器进行测量。数据揭示了ABC效应与积分截面中的洛伦兹形能量依赖性相关。观测值与$pn$和$ΔΔ$系统中的$I(J^P) =0(3^+)$共振一致。必要的进一步测试的共振解释进行了讨论。
英文摘要：
We report on a high-statistics measurement of the basic double pionic fusion reaction $pn \to dπ^0π^0$ over the energy region of the so-called ABC effect, a pronounced low-mass enhancement in the $ππ$-invariant mass spectrum. The measurements were performed with the WASA detector setup at COSY. The data reveal the ABC effect to be associated with a Lorentzian shaped energy dependence in the integral cross section. The observables are consistent with a resonance with $I(J^P) =0(3^+)$ in both $pn$ and $ΔΔ$ systems. Necessary further tests of the resonance interpretation are discussed.
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