中子外$π^0$电产生截面的Rosenbluth分离
Rosenbluth separation of the $π^0$ Electroproduction Cross Section off the Neutron
摘要：
我们报告的第一个纵向/横向分离的深虚拟独家$π^0$电生产截面的中子和相干氘核。相应的四个结构函数$dσ_L/dt$，$dσ_T/dt$，$dσ_{LT}/dt$和$dσ_{TT}/dt$提取作为一个功能的动量转移到反冲系统在$Q^2$ =1.75 GeV $^2$和$x_B$ =0.36。发现$ed \to edπ^0$横截面与理论模型预期的小值兼容。$en \to enπ^0$截面显示出对横向极化光子响应的优势，并且与基于核子横向GPD的计算结果吻合得很好。结合这些结果与以前的测量$π^0$电生产的质子，我们提出了一个味道分解的$u$和$d$夸克贡献的截面。
英文摘要：
We report the first longitudinal/transverse separation of the deeply virtual exclusive $π^0$ electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions $dσ_L/dt$, $dσ_T/dt$, $dσ_{LT}/dt$ and $dσ_{TT}/dt$ are extracted as a function of the momentum transfer to the recoil system at $Q^2$=1.75 GeV$^2$ and $x_B$=0.36. The $ed \to edπ^0$ cross sections are found compatible with the small values expected from theoretical models. The $en \to enπ^0$ cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity GPDs of the nucleon. By combining these results with previous measurements of $π^0$ electroproduction off the proton, we present a flavor decomposition of the $u$ and $d$ quark contributions to the cross section.
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