光子和质子极化的$\vecγ \vec{p}\rightarrow ηp$的新数据及其对$N^* \to Nη$衰变的意义
New data on $\vecγ \vec{p}\rightarrow ηp$ with polarized photons and protons and their implications for $N^* \to Nη$ decays
摘要：
测量了质子光生$η$介子过程中的偏振观测量$T, E, P, H$和$G$，光子能量从阈值到$W=2400\,$ MeV（$T$）、2280 MeV（$E$）、1620 MeV（$P, H$）或1820 MeV（$G$），几乎覆盖了整个立体角。将数据与SAID、MAID、JüBo和BnGa分波分析的预测进行比较。BnGa方法中的一个重新拟合，包括进一步的数据，得到了核子共振的$Nη$衰变的精确分支比。发现$N(1650)1/2^-$的$Nη$ -分支比为$0.33\pm 0.04$，这显著地减少了两个最低质量$J^P=1/2^-$ -共振的大的和有争议的$Nη$ -分支比差异.
英文摘要：
The polarization observables $T, E, P, H$, and $G$ in photoproduction of $η$ mesons off protons are measured for photon energies from threshold to $W=2400\,$MeV ($T$), 2280 MeV ($E$), 1620 MeV ($P, H$), or 1820 MeV ($G$), covering nearly the full solid angle. The data are compared to predictions from the SAID, MAID, JüBo, and BnGa partial-wave analyses. A refit within the BnGa approach including further data yields precise branching ratios for the $Nη$ decay of nucleon resonances. A $Nη$-branching ratio of $0.33\pm 0.04$ for $N(1650)1/2^-$ is found, which reduces the large and controversially discussed $Nη$-branching ratio difference of the two lowest mass $J^P=1/2^-$-resonances significantly.
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