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arXiv 1907.06960hep-phnucl-th
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再论T奇横动量相关部分子分布与广义部分子分布的模型关系

Revisiting model relations between T-odd transverse-momentum dependent parton distributions and generalized parton distributions

B. Pasquini, S. Rodini, A. Bacchetta

摘要:

我们重新审视广义部分子分布之间的联系,在碰撞参量空间和T奇效应的单自旋不对称性的半包含深非弹性过程。我们表明,非平凡的关系只能在非常特定的条件下建立,通常只有在模型中实现,描述强子作为两体束缚系统,并涉及一个螺旋度守恒耦合之间的规范玻色子和观众系统。这些模型的例子是标量双夸克旁观者模型或核子的夸克靶模型,以及在福克空间展开中最低阶的π介子的相对论模型。

英文摘要:

We revisit the connection between generalized parton distributions in impact parameter space and T-odd effects in single spin asymmetries of the semi-inclusive deep inelastic process. We show that nontrivial relations can be established only under very specific conditions, typically realized only in models that describe hadrons as two-body bound systems and involving a helicity-conserving coupling between the gauge boson and the spectator system. Examples of these models are the the scalar-diquark spectator model or the quark-target model for the nucleon, and relativistic models for the pion at the lowest order in the Fock-space expansion.

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