scholarly journals SINGULARITIES OF GENERALIZED PARTON DISTRIBUTIONS

2012 ◽  
Vol 20 ◽  
pp. 251-265 ◽  
Author(s):  
ANATOLY V. RADYUSHKIN
Keyword(s):  
Sum Rules ◽  
Careful Analysis ◽  
Renormalization Procedure ◽  
Parton Distributions ◽  
Singularity Structure ◽  
Regge Behavior ◽  
Generalized Parton Distributions ◽  
Building Models ◽  
Analytic Regularization ◽  
Recent Developments

We discuss recent developments in building models for GPDs that are based on the formalism of double distributions (DDs). A special attention is given to a careful analysis of the singularity structure of DDs. The DD formalism is applied to construction of a model GPDs with a singular Regge behavior. Within the developed DD-based approach, we discuss the structure of GPD sum rules. It is shown that separation of DDs into the so-called "plus" part and the D-term part may be treated as a renormalization procedure for the GPD sum rules. This approach is compared with an alternative prescription based on analytic regularization.

HADRON SPIN PHYSICS — A THEORY UPDATE

2005 ◽  
Vol 20 (19) ◽  
pp. 4419-4424
Author(s):  
ANDREAS SCHÄFER
Keyword(s):  
Lattice Qcd ◽  
Short Description ◽  
Spin Physics ◽  
Parton Distributions ◽  
Generalized Parton Distributions ◽  
Recent Developments

I give a short description of some recent developments in hadron spin physics focussing on the concept of Generalized Parton Distributions and the role of lattice-QCD-calculations.

Transverse charge and magnetization densities based on Regge parameterization

2015 ◽  
Vol 24 (11) ◽  
pp. 1550086 ◽  
Author(s):  
Negin Sattary Nikkhoo ◽  
Mohammad Reza Shojaei
Keyword(s):  
Sum Rules ◽  
Form Factors ◽  
Transverse Plane ◽  
Large Momentum ◽  
Electromagnetic Form Factors ◽  
Parton Distributions ◽  
Generalized Parton Distributions ◽  
Transfer Region ◽  
Quark Charge ◽  
Elastic Form

In this paper, we discuss the charge and magnetization densities for proton and neutron in the transverse plane, whereas there are links between the generalized parton distributions (GPDs) and elastic form factors by means of sum rules. We use the extended Regge parameterization for large momentum transfer region for calculating Dirac and Pauli form factors which have been described in the electromagnetic form factors data, so we want to calculate the charge and magnetization densities for proton and neutron in the transverse plane and we also calculate [Formula: see text] and [Formula: see text] quark charge and magnetization densities. The extracted results are compared with other previous parameterizations.

QUARK ORBITAL ANGULAR MOMENTUM AND GENERALIZED PARTON DISTRIBUTIONS

2003 ◽  
Vol 18 (08) ◽  
pp. 1303-1309 ◽  
Author(s):  
XIANGDONG JI
Keyword(s):  
Angular Momentum ◽  
Quantum Chromodynamics ◽  
Orbital Angular Momentum ◽  
Parton Distributions ◽  
Generalized Parton Distributions ◽  
Quark Orbital Angular Momentum

In this talk, I review the merit of introducing and measuring the quark orbital angular momentum contribution to the spin of the nucleon in the context of quantum chromodynamics.

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