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.

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.

A THERMODYNAMICAL BAG MODEL FOR NUCLEON STRUCTURE FUNCTIONS

1994 ◽  
Vol 09 (37) ◽  
pp. 3455-3465 ◽  
Author(s):  
V. DEVANATHAN ◽  
S. KARTHIYAYINI ◽  
K. GANESAMURTHY
Keyword(s):  
Experimental Data ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Parton Distribution ◽  
Equations Of State ◽  
Structure Functions ◽  
Distribution Functions ◽  
Nucleon Structure ◽  
Parton Distribution Functions ◽  
Bag Model

A thermodynamical bag model is proposed to study the parton distribution functions and nucleon structure functions in the deep inelastic scattering (DIS) of leptons on nucleons. Equations of state for the thermodynamical bag are deduced and solved self-consistently. The theory explains all the observed features in DIS and gives a good fit to the experimental data.

scholarly journals POLARIZED STRUCTURE FUNCTIONS AND SPIN PHYSICS

2002 ◽  
Vol 17 (23) ◽  
pp. 3220-3238
Author(s):  
UTA STÖSSLEIN
Keyword(s):  
Parton Distribution ◽  
Spin Structure ◽  
High Energy ◽  
Structure Functions ◽  
Distribution Functions ◽  
High Energy Particle ◽  
Particle Interactions ◽  
Parton Distribution Functions ◽  
Spin Physics ◽  
Further Development

Recent progress in the field of spin physics of high energy particle interactions is reviewed with particular emphasis on the spin structure functions as measured in polarized deep inelastic lepton-nucleon scattering (DIS). New measurements are presented to obtain more direct information on the composition of the nucleon angular momentum, with results from semi-inclusive DIS accessing flavour-separated parton distribution functions (PDF) and with first data from hard exclusive reactions which may be interpreted in terms of recently developed generalizations of parton distribution functions (GPD). Finally, experimental prospects are outlined which will lead to a further development of the virtues of QCD phenomenology of the spin structure of the nucleon.

UNCERTAINTY OF POLARIZED PARTON DISTRIBUTIONS

2003 ◽  
Vol 18 (08) ◽  
pp. 1203-1210 ◽  
Author(s):  
◽  
M. HIRAI ◽  
Y. GOTO ◽  
T. HORAGUCHI ◽  
H. KOBAYASHI ◽  
...  
Keyword(s):  
Experimental Data ◽  
Parton Distribution ◽  
Gluon Distribution ◽  
Distribution Functions ◽  
Prompt Photon ◽  
Parton Distribution Functions ◽  
Parton Distributions ◽  
Photon Process ◽  
Hessian Method ◽  
Polarized Gluon

Polarized parton distribution functions are determined by a χ2 analysis of polarized deep inelastic experimental data. In this paper, uncertainty of obtained distribution functions is investigated by a Hessian method. We find that the uncertainty of the polarized gluon distribution is fairly large. Then, we estimate the gluon uncertainty by including the fake data which are generated from prompt photon process at RHIC. We observed that the uncertainty could be reduced with these data.

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.

scholarly journals RELATIVISTIC DESCRIPTION OF THE CHARMONIUM MASS SPECTRUM

2005 ◽  
Vol 20 (12) ◽  
pp. 875-880 ◽  
Author(s):  
D. EBERT ◽  
R. N. FAUSTOV ◽  
V. O. GALKIN
Keyword(s):  
Experimental Data ◽  
Mass Spectrum ◽  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Relativistic Treatment ◽  
Relativistic Description ◽  
Good Agreement

The charmonium mass spectrum is considered in the framework of the constituent quark model with the relativistic treatment of the c quark. The obtained masses are in good agreement with the existing experimental data including the mass of ηc(2S).

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 Higher Twist Structure Functions

1997 ◽  
Vol 50 (1) ◽  
pp. 61 ◽  
Author(s):  
A. I. Signal
Keyword(s):  
Parton Distribution ◽  
Structure Functions ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Bag Model ◽  
Mit Bag Model ◽  
Twist Structure

I discuss the importance of some of the higher twist structure functions, and then calculate the twist-two, three and four parton distribution functions involving two quark unpolarized correlations using the wavefunction of the MIT bag model.

FLAVOR AND SPIN DEPENDENT STRUCTURE OF THE NUCLEON AND MESON

2012 ◽  
Vol 27 (01) ◽  
pp. 1250003 ◽  
Author(s):  
ABOLFAZL MIRJALILI ◽  
KIANOOSH KESHAVARZIAN ◽  
MOHAMMAD MEHDI YAZDANPANAH
Keyword(s):  
Structure Function ◽  
Parton Distribution ◽  
Distribution Functions ◽  
Spin Dependence ◽  
Convolution Integral ◽  
Parton Distribution Functions ◽  
High Q ◽  
Goldstone Bosons ◽  
Analytical Result ◽  
First Moment

We employ the polarized chiral constituent quarks to extract the polarized structure function of the nucleon. The polarized valon model is used to calculate the spin dependence of parton distribution functions of meson. The connection between the polarized structure of the proton and the Goldstone bosons, using the chiral quark model (χQM) is analyzed and the spin dependence of the parton distribution functions for pion and kaon, is obtained thoroughly. These functions are evolved to high Q2 values, using the singlet, nonsinglet and quark–gluon moments (ΔMS, ΔMNS, ΔMgq) which are convoluted with the polarized valon distributions. The polarized valon distributions for meson are computed, based on a phenomenological method and a comparison between polarized and unpolarized parton distribution functions for pion and kaon are performed. As a consequence of the χQM, the SU (3)f symmetry breaking for the spin dependent of the nucleon sea distributions is achieved. The required polarized parton distributions of the proton will be obtained from the parton distribution functions of the polarized meson via the related convolution integral which are existed in the χQM. Following that the analytical result for the proton's spin structure function, [Formula: see text], is obtained and compared with experimental data. Finally, the parton orbital angular momentum of meson are introduced and the total spin of the meson, based on this quantity and the first moment of distributions for gluon and singlet sectors, are obtained.

scholarly journals B-meson production in the general-mass variable-flavour-number scheme and LHC data

2019 ◽  
Vol 79 (10) ◽  
Author(s):  
M. Benzke ◽  
B. A. Kniehl ◽  
G. Kramer ◽  
I. Schienbein ◽  
H. Spiesberger
Keyword(s):  
Experimental Data ◽  
Parton Distribution ◽  
B Meson ◽  
Meson Production ◽  
Distribution Functions ◽  
Leading Order ◽  
Parton Distribution Functions ◽  
Perfect Agreement ◽  
Scale Parameters ◽  
General Mass

Abstract We study inclusive B-meson production in pp collisions at the LHC and compare experimental data with predictions of the general-mass variable-flavour-number scheme at next-to-leading order of perturbative QCD. We find almost perfect agreement provided that the factorization scale parameters and the parton distribution functions are chosen appropriately.

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