4.4 Article

Gravitational form factors and angular momentum densities in light-front quark-diquark model

Journal

EUROPEAN PHYSICAL JOURNAL A
Volume 53, Issue 12, Pages -

Publisher

SPRINGER
DOI: 10.1140/epja/i2017-12433-0

Keywords

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Funding

  1. Science and Engineering Research Board, a statutory board under Department of Science and Technology, Government of India under the National Post-Doctoral Fellowship [PDF/2016/000722]
  2. China Postdoctoral Science Foundation [2017M623279]
  3. University Grants Commission (UGC), Government of India [F.4-2/2006 (BSR)/PH/16-17/0007]

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We investigate the gravitational form factors (GFFs) and the longitudinal momentum densities (p(+) densities) for proton in a light-front quark-diquark model. The light-front wave functions are constructed from the soft-wall AdS/QCD prediction. The contributions from both the scalar and the axial vector diquarks are considered here. The results are compared with the consequences of a parametrization of nucleon generalized parton distributions (GPDs) in the light of recent MRST measurements of parton distribution functions (PDFs) and a soft-wall AdS/QCD model. The spatial distribution of angular momentum for up and down quarks inside the nucleon has been presented. At the density level, we illustrate different definitions of angular momentum explicitly for an up and down quark in the light-front quark-diquark model inspired by AdS/QCD.

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