The transverse nucleon single-spin asymmetry for the semi-inclusive production of photons in lepton-nucleon scattering
The transverse nucleon single-spin asymmetry for the semi-inclusive production of photons in lepton-nucleon scattering
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DOI：
10.1016/j.physletb.2020.135367
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发表时间：
2019-10
影响因子：
4.4
通讯作者：
W. S. Albaltan;A. Prokudin;M. Schlegel
中科院分区：
文献类型：
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作者：
W. S. Albaltan;A. Prokudin;M. Schlegel
本文研究了非极化和极化轻子-质子碰撞中真实的、高pT、孤立光子的半包含产生.特别地，我们分析了在微扰QCD中的共线扭曲-3形式下的横核子单自旋不对称性到首阶（LO）精度。我们发现这种自旋不对称性是由核子中的夸克-胶子-夸克（qgq）扭3动力学关联通过所谓的软费米子和硬极贡献产生的。因此，这一过程前所未有地允许在轻子-核子散射实验中逐点扫描动力学qgq twist-3矩阵元F F T（x，x′）和G F T（x，x′）的支持。
We study the semi-inclusive production of real, high-p T, isolated photons in unpolarized and polarized lepton-proton collisions, ℓ p→ ℓ γ X. In particular we analyze the transverse nucleon single-spin asymmetry within the collinear twist-3 formalism in perturbative QCD to leading order (LO) accuracy. We find that this spin asymmetry is generated by twist-3 dynamical quark-gluon-quark (qgq) correlations in the nucleon through the so-called soft-fermion and hard pole contributions. Hence, this process unprecedentedly allows for a point-by-point scan of the support of the dynamical qgq twist-3 matrix elements F F T (x, x′) and G F T (x, x′) in lepton-nucleon scattering experiments.