论文标题
连贯的$π^0π^0 d $光生生效的二骨光谱的证据
Evidence of a dibaryon spectrum in coherent $π^0π^0 d$ photoproduction at forward deuteron angles
论文作者
论文摘要
相干反应，$γd\rightArrowπ^0π^0 d $通过ELSA的BGood实验从阈值到2850 \，MEV的质量中心。进行了完整的运动学重建，最终的状态杜特龙在前部光谱仪中确定，$π^0 $在中央BGO橄榄球球中衰减。差分横截面的强度超过了相干光生物模型可以描述的，而是支持Elph协作报告的三个等iSoscalar dibaryon候选者，分别为2.38、2.47和2.63 \，GEV/C $^2 $。在$ d^*（2380）$ d^*（2380）$中质量能量中，还观察到$π^0π^0 $不变质量的低质量增强，这与ABC效应是一致的。在较高的质量能量中，$π^0 d $不变的质量在2114 \，Mev/c $^2 $中的狭窄峰值，宽度为20 \，Mev/c $^2 $支持一种顺序的两二巴里亚衰减机制。
The coherent reaction, $γd \rightarrow π^0π^0 d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850\,MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and $π^0$ decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction and instead supports the three isoscalar dibaryon candidates reported by the ELPH collaboration at 2.38, 2.47 and 2.63\,GeV/c$^2$. A low mass enhancement in the $π^0π^0$ invariant mass is also observed at the $d^*(2380)$ centre-of-mass energy which is consistent with the ABC effect. At higher centre-of-mass energies, a narrow peak in the $π^0 d$ invariant mass at 2114\,MeV/c$^2$ with a width of 20\,MeV/c$^2$ supports a sequential two-dibaryon decay mechanism.
