Higher twist parton distributions from light-cone wave functions

Abstract

We explore the possibility to construct higher-twist parton distributions in a nucleon at some low reference scale from convolution integrals of the light-cone wave functions (WFs). To this end we introduce simple models for the four-particle nucleon WFs involving three valence quarks and a gluon with total orbital momentum zero, and estimate their normalization (WF at the origin) using QCD sum rules. We demonstrate that these WFs provide one with a reasonable description of both polarized and unpolarized gluon parton densities at large values of Bjorken variable x > 0.5. Twist-three parton distributions are then constructed as convolution integrals of qqqg and usual three-quark WFs. The cases of the polarized structure function g_2(x,Q^2) and single transverse spin asymmetries are considered in detail. We find that the so-called gluon-pole contribution to twist-three distributions relevant for single spin asymmetry vanishes in this model, but is generated perturbatively at higher scales by the evolution, in the spirit of GRV parton distributions.

22 pages, 11 figures

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• The Spin Structure of the Nucleon
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• Extraction of the Sivers function from SIDIS, Drell-Yan, and $W^{\pm }/Z$ boson production data with TMD evolution
• Impact of hadronic and nuclear corrections on global analysis of spin-dependent parton distributions
• Nucleon Form Factors and Distribution Amplitudes in QCD
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• Measurements of $d_2^n$ and $A_1^n$: Probing the neutron spin structure
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• Revealing Color Forces with Transverse Polarized Electron Scattering
• Transverse single-spin asymmetries in $p^{\uparrow }p\to \gamma X$ from quark-gluon-quark correlations in the proton
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• Analysis of the double-spin asymmetry A_LT in inelastic nucleon-nucleon collisions
• QCD factorization for twist-three axial-vector parton quasidistributions
• Collinear parton distributions and the structure of the nucleon sea in a light-front meson-cloud model
• Target mass corrections and higher twist effects in polarized deep-inelastic scattering
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• Twist-four Corrections to Parity-Violating Electron-Deuteron Scattering
• Higher Twists
• Transverse Nucleon Single-Spin Asymmetry for Single-Inclusive Hadron and Jet Production at NLO Accuracy
• Baryon octet distribution amplitudes in Wandzura-Wilczek approximation
• Double-spin asymmetry $A_{LT}^{\cos {\varphi }_S}$ in semi-inclusive DIS at CLAS12 and EIC within the collinear framework
• Nucleon spin structure functions, considering target mass correction and higher twist effects at the NNLO accuracy and their transverse momentum dependence
• Light-cone distribution amplitudes of the nucleon and $\Delta$ baryon