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Twist-2 generalized transverse-momentum dependent parton distributions and the spin/orbital structure of the nucleon

Abstract : Generalized transverse-momentum dependent parton distributions (GTMDs) encode the most general parton structure of hadrons. Here we focus on two twist-2 GTMDs which are denoted by $F_{1,4}$ and $G_{1,1}$ in parts of the literature. As already shown previously, both GTMDs have a close relation to orbital angular momentum of partons inside a hadron. However, recently even the mere existence of $F_{1,4}$ and $G_{1,1}$ has been doubted. We explain why this claim does not hold. We support our model-independent considerations by calculating the two GTMDs in the scalar diquark model and in the quark-target model, where we also explicitly check the relation to orbital angular momentum. In addition, we compute $F_{1,4}$ and $G_{1,1}$ at large transverse momentum in perturbative Quantum Chromodynamics and show that they are nonzero.
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http://hal.in2p3.fr/in2p3-00992880
Contributor : Sophie Heurteau <>
Submitted on : Monday, May 19, 2014 - 2:07:10 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:32 PM

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K. Kanazawa, C. Lorcé, A. Metz, B. Pasquini, M. Schlegel. Twist-2 generalized transverse-momentum dependent parton distributions and the spin/orbital structure of the nucleon. Physical Review D, American Physical Society, 2014, 90 (1), pp. 014028. ⟨10.1103/PhysRevD.90.014028⟩. ⟨in2p3-00992880⟩

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