scholarly journals Momentum transfer dependence of generalized parton distributions

2016 ◽  
Vol 52 (11) ◽  
Author(s):  
Neetika Sharma
Keyword(s):  
Momentum Transfer ◽  
Parton Distributions ◽  
Generalized Parton Distributions ◽  
Momentum Transfer Dependence

scholarly journals DEEPLY VIRTUAL AND EXCLUSIVE PRODUCTION OF THE OMEGA MESON

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1943-1946
Author(s):  
◽  
M. GARÇON ◽  
L. MORAND ◽  
D. DORÉ ◽  
J.-M. LAGET ◽  
...  
Keyword(s):  
Density Matrix ◽  
Momentum Transfer ◽  
Cross Sections ◽  
Spin Density Matrix ◽  
Matrix Elements ◽  
Photon Virtuality ◽  
Parton Distributions ◽  
Exclusive Production ◽  
Generalized Parton Distributions ◽  
Omega Meson

Exclusive ω electroproduction off the proton was measured at the highest possible four-momentum transfer with the (close to) 6 GeV beam now available at CEBAF. Cross sections are presented, together with an analysis of the ω spin density matrix elements. Indications are that π0 exchange in the t-channel (or rather the exchange of the corresponding saturating Regge trajectory) seems to dominate the process γ*p→ωp, even for photon virtuality Q2 as large as 5 GeV2. Contributions of the handbag type, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract from this particular process.

scholarly journals Generalized Parton Distributions and the Structure of the Hadrons

2018 ◽  
Vol 47 ◽  
pp. 1860099
Author(s):  
O. V. Selyugin
Keyword(s):  
Form Factors ◽  
Distribution Functions ◽  
Electromagnetic Form Factors ◽  
Parton Distribution Functions ◽  
Parton Distributions ◽  
Hadron Interaction ◽  
High Energies ◽  
Generalized Parton Distributions ◽  
Momentum Transfer Dependence ◽  
The Impact

The dependence of the hadron interaction on its structure is examined in the framework of the generalized parton distributions (GPDs). The [Formula: see text] dependence of the GPDs is determined by the parton distribution functions (PDFs), which were obtained from the deep inelastic scattering. The analysis of the whole sets of experimental data on the electromagnetic form factors of the proton and neutron with taking into account many forms of PDFs, obtained by the different Collaborations, make it possible to obtain the special momentum transfer dependence of the GPDs. This permits us to obtain the electromagnetic and gravitomagnetic form factors of the nucleons. The impact parameter dependence of the proton and neutron charge and matter densities is examined. The elastic hadron scattering at high energies was analyzed in the framework of the model that takes into account both these form factors (electromagnetic and gravitomagnetic).

GENERALIZED PARTON DISTRIBUTIONS IN THE CHIRAL ODD SECTOR AND THEIR ROLE IN NEUTRAL MESON ELECTROPRODUCTION

2012 ◽  
Vol 20 ◽  
pp. 222-229 ◽  
Author(s):  
GARY R. GOLDSTEIN ◽  
SIMONETTA LIUTI ◽  
J. OSVALDO GONZALEZ-HERNANDEZ
Keyword(s):  
Angular Momentum ◽  
Momentum Transfer ◽  
Charge Conjugation ◽  
Neutral Meson ◽  
Parton Distributions ◽  
Quantum Numbers ◽  
Generalized Parton Distributions ◽  
Meson Electroproduction

Our original suggestion to investigate exclusive π0 electroproduction as a method for extracting from data the tensor charge, transversity, and other quantities related to chiral odd generalized parton distributions is further examined. We now explain the details of the process: i) the connection between the helicity description and the cartesian basis; ii) the dependence on the momentum transfer squared, Q2, and iii) the angular momentum, parity, and charge conjugation constraints (JPC quantum numbers).

scholarly journals OBSERVATIONS OF CHIRAL ODD GPDs AND THEIR IMPLICATIONS

2014 ◽  
Vol 25 ◽  
pp. 1460035 ◽  
Author(s):  
GARY R. GOLDSTEIN ◽  
SIMONETTA LIUTI ◽  
J. OSVALDO GONZALEZ-HERNANDEZ
Keyword(s):  
Angular Momentum ◽  
Momentum Transfer ◽  
Cross Section ◽  
Charge Conjugation ◽  
Parton Distributions ◽  
Quantum Numbers ◽  
Generalized Parton Distributions ◽  
Asymmetry Data

Our original suggestion to investigate exclusive π0 electroproduction as a method for extracting the tensor charge, transversity, and other quantities related to chiral odd generalized parton distributions from cross section and asymmetry data is reviewed. We explain some of the details of the process: i) the connection between the helicity description and the cartesian basis; ii) the dependence on the momentum transfer squared, Q2, and iii) the angular momentum, parity, and charge conjugation constraints (JPC quantum numbers).

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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