论文标题
质子的横向自旋总和
Transverse spin sum rule of the proton
论文作者
论文摘要
具有任意动量的质子的横向偏振状态不是横向角动量算子的特征态。后者不与QCD哈密顿官通勤。但是，状态横向动量的期望值是明确的，并且与粒子的能量成比例地生长。根据QCD角动量结构分析质子的横向自旋含量。特别是，我们重新确认，通用的Parton分布$ H+E $提供了无限动量框架中夸克和胶子的横向轨道角动量密度。
The transversely-polarized state of a proton with arbitrary momentum is not an eigenstate of transverse angular momentum operator. The latter does not commute with the QCD Hamiltonian. However, the expectation value of the transverse angular momentum in the state is well-defined and grows proportionally to the energy of the particle. The transverse spin content of the proton is analyzed in terms of the QCD angular momentum structure. In particular, we reconfirm that the generalized parton distributions $H+E$ provide transverse orbital angular momentum densities of quarks and gluons in the infinite momentum frame.
