scholarly journals Generalized parton distribution functions of $\rho$ meson

2020 ◽  
Author(s):  
Baodong Sun ◽  
Yubing Dong
Keyword(s):  
Parton Distribution ◽  
Constituent Quark ◽  
Form Factors ◽  
Constituent Quark Model ◽  
Momentum Tensor ◽  
Distribution Functions ◽  
Tensor Form ◽  
Parton Distribution Functions ◽  
Rho Meson ◽  
Mass Distributions

We report our recent studies of generalized parton distribution functions of a \rhoρ meson with the help of a light-front constituent quark model. The electromagnetic form factors and structure functions of the system are discussed. Moreover, we show our results for its gravitational form factors (or energy-momentum tensor form factors) and other mechanical properties, like mass distributions, pressures, shear forces, and D-D−term.

scholarly journals NUCLEAR PARTON DENSITIES AND STRUCTURE FUNCTIONS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1927-1930 ◽  
Author(s):  
S. ATASHBAR TEHRANI ◽  
ALI N. KHORRAMIAN ◽  
A. MIRJALILI
Keyword(s):  
Experimental Data ◽  
Structure Function ◽  
Nuclear Structure ◽  
Parton Distribution ◽  
Constituent Quark ◽  
Structure Functions ◽  
Constituent Quark Model ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Good Agreement

We calculate nuclear parton distribution functions (PDFs), using the constituent quark model. We find the bounded valon distributions in a nuclear to be related to free valon distributions in a nucleon. By using improved bounded valon distributions for a nuclear with atomic number A and the partonic structure functions inside the valon, we can calculate the nuclear structure function in x space. The results for nuclear structure-function ratio [Formula: see text] at some values of A, are in good agreement with the experimental data.

Progress in the calculation of nucleon form factors and parton distribution functions

2003 ◽  
Vol 721 ◽  
pp. C915-C921 ◽  
Author(s):  
A.W. Thomas ◽  
J.D. Ashley ◽  
W. Detmold ◽  
D.B. Leinweber ◽  
W. Melnitchouk ◽  
...  
Keyword(s):  
Parton Distribution ◽  
Form Factors ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Nucleon Form Factors

scholarly journals The Drell-Yan process with pions and polarized nucleons

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
S. Bastami ◽  
L. Gamberg ◽  
B. Parsamyan ◽  
B. Pasquini ◽  
A. Prokudin ◽  
...  
Keyword(s):  
Constituent Quark ◽  
Constituent Quark Model ◽  
Experimental Information ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Transverse Momentum Dependent ◽  
Precise Data ◽  
The Spectator ◽  
First Time ◽  
Twist Structure

Abstract The Drell-Yan process provides important information on the internal struc- ture of hadrons including transverse momentum dependent parton distribution functions (TMDs). In this work we present calculations for all leading twist structure functions de- scribing the pion induced Drell-Yan process. The non-perturbative input for the TMDs is taken from the light-front constituent quark model, the spectator model, and available parametrizations of TMDs extracted from the experimental data. TMD evolution is im- plemented at Next-to-Leading Logarithmic precision for the first time for all asymmetries. Our results are compatible with the first experimental information, help to interpret the data from ongoing experiments, and will allow one to quantitatively assess the models in future when more precise data will become available.

Study of deuteron generalized parton distribution functions and its tensor structure function

2014 ◽  
Vol 29 ◽  
pp. 1460229 ◽  
Author(s):  
Yubing Dong ◽  
Cuiying Liang
Keyword(s):  
Structure Function ◽  
Parton Distribution ◽  
Form Factors ◽  
Distribution Functions ◽  
Lagrangian Approach ◽  
Tensor Structure ◽  
Parton Distribution Functions ◽  
Effective Lagrangian

The generalized parton distribution functions of deuteron are studied based on a phenomenological effective Lagrangian approach. The electric, magnetic and quadrupole form factors are estimated. Moreover, the tensor structure function of the deuteron is discussed.

scholarly journals Double parton correlations in mesons within AdS/QCD soft-wall models: a first comparison with lattice data

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Matteo Rinaldi
Keyword(s):  
Lattice Qcd ◽  
Parton Distribution ◽  
General Procedure ◽  
Form Factors ◽  
Distribution Functions ◽  
Lattice Data ◽  
Parton Distribution Functions ◽  
Model Calculations ◽  
Double Parton Scattering ◽  
Soft Wall

Abstract Double parton distribution functions (dPDFs), entering the double parton scattering (DPS) cross section, are unknown fundamental quantities encoding new interesting properties of hadrons. Here, the pion dPDFs are investigated within different holographic QCD quark models in order to access their basic features. Results of the calculations obtained within the AdS/QCD soft-wall approach, have been compared with predictions of lattice QCD evaluations of the pion two-current correlation functions. The present analysis confirms that double parton correlations, affecting dPDFs, are very important and not direct accessible from generalised parton distribution functions and electromagnetic form factors. The comparison between lattice data and quark model calculations unveils the relevance of the contributions of high partonic Fock states in the pion. Nevertheless, by using a complete general procedure, results of lattice QCD have been used, for the first time, to estimate the mean value of the so called $$\sigma _{eff}$$σeff, a relevant experimental observable for DPS processes. In addition, the results of the first calculations of the $$\rho $$ρ meson dPDFs are discussed in order to make predictions.

PARTON DISTRIBUTION FUNCTIONS AND THE QCD-IMPROVED PARTON MODEL — AN OVERVIEW

1987 ◽  
Vol 02 (04) ◽  
pp. 1369-1387 ◽  
Author(s):  
Wu-Ki Tung
Keyword(s):  
Parton Distribution ◽  
Particle Production ◽  
Heavy Particle ◽  
Parton Model ◽  
Distribution Functions ◽  
Collider Physics ◽  
Parton Distribution Functions ◽  
Parton Distributions ◽  
First Order ◽  
Small X

Some non-trivial features of the QCD-improved parton model relevant to applications on heavy particle production and semi-hard (small-x) processes of interest to collider physics are reviewed. The underlying ideas are illustrated by a simple example. Limitations of the naive parton formula as well as first order corrections and subtractions to it are dis-cussed in a quantitative way. The behavior of parton distribution functions at small x and for heavy quarks are discussed. Recent work on possible impact of unconventional small-x behavior of the parton distributions on small-x physics at SSC and Tevatron are summarized. The Drell-Yan process is found to be particularly sensitive to the small x dependence of parton distributions. Measurements of this process at the Tevatron can provide powerful constraints on the expected rates of semi-hard processes at the SSC.

scholarly journals PDFFlow: Parton distribution functions on GPU

2021 ◽  
Vol 264 ◽  
pp. 107995
Author(s):  
Stefano Carrazza ◽  
Juan M. Cruz-Martinez ◽  
Marco Rossi
Keyword(s):  
Parton Distribution ◽  
Distribution Functions ◽  
Parton Distribution Functions

scholarly journals Delineating the Polarized and Unpolarized Parton Structure of the Nucleon

2015 ◽  
Vol 37 ◽  
pp. 1560053
Author(s):  
Pedro Jimenez-Delgado
Keyword(s):  
Parton Distribution ◽  
Distribution Functions ◽  
Distribution Analysis ◽  
Coupling Constant ◽  
Parton Distribution Functions ◽  
Careful Treatment ◽  
Future Data ◽  
The Impact

Reports on our latest extractions of parton distribution functions of the nucleon are given. First an overview of the recent JR14 upgrade of our unpolarized PDFs, including NNLO determinations of the strong coupling constant and a discussion of the role of the input scale in parton distribution analysis. In the second part of the talk recent results on the determination of spin-dependent PDFs from the JAM collaboration are reported, including a careful treatment of hadronic and nuclear corrections, as well as reports on the impact of present and future data in our understanding of the spin of the nucleon.

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