S_{11}（1535）光耦合的Q^2依赖性和eta电产生中P波共振的证据
Q^2 Dependence of the S_{11}(1535) Photocoupling and Evidence for a P-wave resonance in eta electroproduction
摘要：
在总质心能量$W$ =1.5- 2.3GeV，不变平方动量转移$Q^2$ =0.13- 3.3GeV $^2$的条件下，给出了反应$ep \to e'ηp$的新截面.这个大的运动学范围允许提取有关重子共振的响应函数、光耦合和$ηN$耦合强度的新信息。在$W\sim$ 1.7 GeV处观察到一个尖锐的结构。微分横截面的形状指示持续到高$Q^2$的$P$波共振的存在。对于$S_{11}$（1535）共振，导出了光子耦合振幅的改进值。新数据大大扩展了$Q^2$的覆盖范围，并提供了对所有数据的一致参数化解释。
英文摘要：
New cross sections for the reaction $ep \to e'ηp$ are reported for total center of mass energy $W$=1.5--2.3 GeV and invariant squared momentum transfer $Q^2$=0.13--3.3 GeV$^2$. This large kinematic range allows extraction of new information about response functions, photocouplings, and $ηN$ coupling strengths of baryon resonances. A sharp structure is seen at $W\sim$ 1.7 GeV. The shape of the differential cross section is indicative of the presence of a $P$-wave resonance that persists to high $Q^2$. Improved values are derived for the photon coupling amplitude for the $S_{11}$(1535) resonance. The new data greatly expands the $Q^2$ range covered and an interpretation of all data with a consistent parameterization is provided.
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