The transverse nucleon single-spin asymmetry for the semi-inclusive production of photons in lepton-nucleon scattering

Abstract

We study the semi-inclusive production of real, high-$p_T$, isolated photons in unpolarized and polarized lepton-proton collisions, $\ell p\to \ell \gamma X$. 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 $F_{FT}(x,x^{\prime })$ and $G_{FT}(x,x^{\prime })$ in lepton-nucleon scattering experiments.

10 pages, 4 figures

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Cited by in corpus (4)

• Probing Nucleons and Nuclei in High Energy Collisions
• Transverse Nucleon Single-Spin Asymmetry for Single-Inclusive Hadron and Jet Production at NLO Accuracy
• Probing the polarized photon content of the proton in $ep$ collisions at the EIC
• Fragmentation contributions to transverse nucleon spin observables in semi-inclusive deep-inelastic scattering at NLO