论文标题
从硬独占$π^+$ eartro-upproduction of gpd制度中的质子的质子中的结构函数比$σ_{lt'}/σ_{0} $的结构函数比率的多维研究
A multidimensional study of the structure function ratio $σ_{LT'}/σ_{0}$ from hard exclusive $π^+$ electro-production off protons in the GPD regime
论文作者
论文摘要
结构函数比率的多维提取$σ_{lt'}/σ_{0} $从硬性$ \ vec {e} p \ to e^\ primenπ^+$反应上方上方的硬性$ \ vec {e} p \ to e^\ primenπ^+$。这项研究是基于光束旋转不对称测量的，使用液体 - 氢靶标上的10.6 GEV入射电子束和杰斐逊实验室的CLAS12光谱仪进行。这些测量值集中于非常向前的制度（$ t/q^{2} $ $ \ ll $ 1），在Valence制度中具有$ x_ {b} $宽的运动范围（0.17 $ <$ x_ $ x_ {b} $ $ $ $ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ 0.55） GEV $^{2} $。结果及其与理论模型基于广义分布的比较证明了对手性gpd的敏感性以及核子的直接相关张量电荷。此外，将数据与高光子虚拟上的regge形式主义的扩展进行了比较。发现Regge模型在低$ Q^{2} $上提供了更好的描述，而GPD模型更合适，在高$ q^{2} $上。
A multidimensional extraction of the structure function ratio $σ_{LT'}/σ_{0}$ from the hard exclusive $\vec{e} p \to e^\prime n π^+$ reaction above the resonance region has been performed. The study was done based on beam-spin asymmetry measurements using a 10.6 GeV incident electron beam on a liquid-hydrogen target and the CLAS12 spectrometer at Jefferson Lab. The measurements focus on the very forward regime ($t/Q^{2}$ $\ll$ 1) with a wide kinematic range of $x_{B}$ in the valence regime (0.17 $<$ $x_{B}$ $<$ 0.55), and virtualities $Q^{2}$ ranging from 1.5 GeV$^{2}$ up to 6 GeV$^{2}$. The results and their comparison to theoretical models based on Generalized Parton Distributions demonstrate the sensitivity to chiral-odd GPDs and the directly related tensor charge of the nucleon. In addition, the data is compared to an extension of a Regge formalism at high photon virtualities. It was found that the Regge model provides a better description at low $Q^{2}$, while the GPD model is more appropriate at high $Q^{2}$.
