Belitsky A V, Ji Xiangdong, Yuan Feng
Department of Physics, University of Maryland, College Park, MD 20742-4111, USA.
Phys Rev Lett. 2003 Aug 29;91(9):092003. doi: 10.1103/PhysRevLett.91.092003. Epub 2003 Aug 27.
We perform a perturbative QCD analysis of the nucleon's Pauli form factor F2(Q2) in the asymptotically large Q2 limit. We find that the leading contribution to F2(Q2) has a 1/Q6 power behavior, consistent with the well-known result in the literature. Its coefficient depends on the leading- and subleading-twist light-cone wave functions of the nucleon, the latter describing the quarks with one unit of orbital angular momentum. We also derive at the logarithmic accuracy the asymptotic scaling F2(Q2)/F(1)(Q2) approximately (log2Q2/Lambda2)/Q2 which describes recent Jefferson Lab data well.
我们在渐近大Q²极限下对核子的泡利形状因子F₂(Q²)进行微扰量子色动力学分析。我们发现，对F₂(Q²)的主导贡献具有1/Q⁶幂次行为，这与文献中的著名结果一致。其系数取决于核子的主导和次主导扭转光锥波函数，后者描述具有一个轨道角动量单位的夸克。我们还在对数精度下推导出渐近标度F₂(Q²)/F₁(Q²)≈(log²Q²/Λ²)/Q²，它能很好地描述最近杰斐逊实验室的数据。
