Parametrizations of quarks distribution functions of the nucleon in a scalar diquark model

1993 ◽  
Vol 59 (2) ◽  
pp. 333-339 ◽  
Author(s):  
J. J. Dugne ◽  
P. Tavernier
Keyword(s):  
Distribution Functions ◽  
Diquark Model ◽  
Scalar Diquark

scholarly journals Remark on the Kinematics of the One-Photon Production in Electron–Proton Scattering

1997 ◽  
Vol 12 (21) ◽  
pp. 1553-1559
Author(s):  
Wei Lu
Keyword(s):  
Phase Space ◽  
Deeply Virtual Compton Scattering ◽  
Quark Distribution ◽  
Photon Production ◽  
Distribution Functions ◽  
Proton Scattering ◽  
Diquark Model ◽  
Space Factor ◽  
The Cross ◽  
The One

We clarify some misleading mistakes in the literature about the phase space for the one-photon production in electron–proton scattering and present the correct overall phase space factor in the cross-section formula. Our conclusion is that the earlier diquark model predictions for the cross-sections of the one-photon production in electron–proton scattering are unreliable. Furthermore, we specify the phase space boundaries. In relation to the recent proposal to measure the off-diagonal quark distribution functions in the deeply virtual Compton scattering off the proton, we point out that the kinematics strongly disfavors such experiments.

scholarly journals Study of Twist-2 GTMDs in Scalar-Diquark Model

2018 ◽  
Vol 59 (4) ◽  
Author(s):  
Satvir Kaur ◽  
Harleen Dahiya
Keyword(s):  
Diquark Model ◽  
Scalar Diquark

scholarly journals Structure Functions of Hadrons in the QCD Effective Theory

1997 ◽  
Vol 50 (1) ◽  
pp. 139
Author(s):  
Takayuki Shigetani ◽  
Katsuhiko Suzuki ◽  
Hiroshi Toki
Keyword(s):  
Quark Distribution ◽  
High Energy ◽  
Structure Functions ◽  
Distribution Functions ◽  
Low Energy ◽  
Effective Theory ◽  
Spin Distribution ◽  
Diquark Model ◽  
Model Calculations ◽  
Diquark Correlation

We study the structure functions of hadrons with the low energy effective theory of QCD. We try to clarify a link between the low energy effective theory, where non-perturbative dynamics is essential, and the high energy deep inelastic scattering experiment. We calculate the leading twist matrix elements of the structure function at the low energy model scale within the effective theory. Calculated structure functions are taken to the high momentum scale with the help of the perturbative QCD, and compared with the experimental data. Through a comparison of the model calculations with the experiment, we discuss how the non-perturbative dynamics of the effective theory is reflected in the deep inelastic phenomena. We first evaluate the structure functions of the pseudoscalar mesons using the NJL model. The resulting structure functions show reasonable agreement with experiments. We then study the quark distribution functions of the nucleon using a covariant quark–diquark model. We calculate three leading twist distribution functions, the spin-independent f1(x), the longitudinal spin distribution g1(x), and the chiral-odd transversity spin distribution h1(x). The results for f1(x) and g1(x) turn out to be consistent with available experiments because of the strong spin-0 diquark correlation.

scholarly journals Orbital Angular Momentum in Scalar Diquark Model and QED

2011 ◽  
Vol 52 (3-4) ◽  
pp. 389-395 ◽  
Author(s):  
Hikmat BC ◽  
Matthias Burkardt
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Diquark Model ◽  
Scalar Diquark

scholarly journals Potential linear and angular momentum in the scalar diquark model

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
David Arturo Amor-Quiroz ◽  
Matthias Burkardt ◽  
William Focillon ◽  
Cédric Lorcé
Keyword(s):  
Angular Momentum ◽  
Transverse Momentum ◽  
Direct Calculation ◽  
Final State ◽  
Diquark Model ◽  
Scalar Diquark ◽  
Angular Momenta ◽  
The Difference ◽  
Definition Of ◽  
Quark Transverse Momentum

AbstractWe present an analytic two-loop calculation within the scalar diquark model of the potential linear and angular momenta, defined as the difference between the Jaffe-Manohar and Ji notions of linear and angular momenta. As expected by parity and time-reversal symmetries, a direct calculation confirms that the potential transverse momentum coincides with the Jaffe-Manohar (or canonical) definition of average quark transverse momentum, also known as the quark Sivers shift. We examine whether initial/final-state interactions at the origin of the Sivers asymmetry can also generate a potential angular momentum in the scalar diquark model.

scholarly journals The angular momentum decomposition in the scalar diquark model.

2019 ◽  
Author(s):  
Arturo Amor-Quiroz ◽  
Matthias Burkardt ◽  
Cedric Lorce
Keyword(s):  
Angular Momentum ◽  
Diquark Model ◽  
Scalar Diquark

scholarly journals Studying twist-2 GPDs through quasi-distributions in a scalar diquark model

2019 ◽  
Author(s):  
Shohini Bhattacharya ◽  
Christopher Cocuzza ◽  
Andreas Metz
Keyword(s):  
Diquark Model ◽  
Scalar Diquark

STRUCTURE FUNCTIONS OF THE NUCLEON IN THE QUARK–DIQUARK MODEL AND EXTENSION TO FINITE DENSITY

2003 ◽  
Vol 18 (08) ◽  
pp. 1413-1416
Author(s):  
H. MINEO ◽  
W. BENTZ ◽  
K. YAZAKI ◽  
A. W. THOMAS
Keyword(s):  
Wave Function ◽  
Light Cone ◽  
Valence Quark ◽  
Axial Vector ◽  
Diquark Model ◽  
Finite Density ◽  
Scalar Diquark ◽  
Njl Model ◽  
Momentum Distributions ◽  
Extract Information

In this work we use a simple approximation to the relativistic Faddeev description of the nucleon in the framework of the Nambu-Jona-Lasinio (NJL) model. We discuss the flavor dependence of valence quark light-cone momentum distributions, and by comparing with the empirical informations we extract information on the strength of the axial vector diquark correlations. As an extension to finite density, we also discuss the EMC effect in nuclear matter, keeping only the scalar diquark channel in the wave function.

Computer processing of high-resolution images of periodic specimens

1986 ◽  
Vol 44 ◽  
pp. 2-5
Author(s):  
W. Chiu ◽  
M.F. Schmid ◽  
T.-W. Jeng
Keyword(s):  
High Resolution ◽  
Fourier Transforms ◽  
Complex Structure ◽  
Distribution Functions ◽  
Multiple Image ◽  
Cryo Electron Microscopy ◽  
Structure Factors ◽  
Unit Cells ◽  
High Resolution Images ◽  
Phase Probability Distribution

Cryo-electron microscopy has been developed to the point where one can image thin protein crystals to 3.5 Å resolution. In our study of the crotoxin complex crystal, we can confirm this structural resolution from optical diffractograms of the low dose images. To retrieve high resolution phases from images, we have to include as many unit cells as possible in order to detect the weak signals in the Fourier transforms of the image. Hayward and Stroud proposed to superimpose multiple image areas by combining phase probability distribution functions for each reflection. The reliability of their phase determination was evaluated in terms of a crystallographic “figure of merit”. Grant and co-workers used a different procedure to enhance the signals from multiple image areas by vector summation of the complex structure factors in reciprocal space.

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