https://doi.org/10.1140/epja/i2017-12433-0
Regular Article - Theoretical Physics
Gravitational form factors and angular momentum densities in light-front quark-diquark model
1
Department of Physics, Indian Institute of Technology Kanpur, 208016, Kanpur, India
2
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
3
Department of Physical Sciences, I K Gujral Punjab Technical University, 144603, Jalandhar, Punjab, India
4
Department of Physics, Panjab University, 160014, Chandigarh, India
* e-mail: mondal@impcas.ac.cn
Received:
2
June
2017
Accepted:
21
November
2017
Published online:
14
December
2017
We investigate the gravitational form factors (GFFs) and the longitudinal momentum densities ( 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.
© SIF, Springer-Verlag GmbH Germany, part of Springer Nature, 2017