scholarly journals Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries

2018 ◽  
Vol 98 (9) ◽  
Author(s):  
M. Anselmino ◽  
M. Boglione ◽  
U. D’Alesio ◽  
F. Murgia ◽  
A. Prokudin
Keyword(s):  
Transverse Momentum ◽  
Parton Distribution ◽  
Momentum Dependence ◽  
Spin Asymmetries ◽  
Transverse Momentum Dependence ◽  
Fragmentation Functions

scholarly journals Unpolarised TMD PDFs and FFs and the role of transverse momentum dependence in azimuthal spin asymmetries

2019 ◽  
Author(s):  
Francesco Murgia ◽  
Mauro Anselmino ◽  
Maria Elena Boglione ◽  
Umberto D'Alesio ◽  
Alexei Prokudin
Keyword(s):  
Transverse Momentum ◽  
Momentum Dependence ◽  
Spin Asymmetries ◽  
Transverse Momentum Dependence

scholarly journals Polarized parton distribution functions: parametrization and transverse momentum dependence

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
H. Nematollahi ◽  
P. Abolhadi ◽  
S. Atashbar ◽  
A. Mirjalili ◽  
M. M. Yazdanpanah
Keyword(s):  
Data Analysis ◽  
Transverse Momentum ◽  
Parton Distribution ◽  
Jacobi Polynomials ◽  
Global Analysis ◽  
Distribution Functions ◽  
Momentum Dependence ◽  
Parton Distribution Functions ◽  
Transverse Momentum Dependent ◽  
Transverse Momentum Dependence

AbstractWe extract the polarized parton distribution functions (PPDFs) of proton. To this end we do a global analysis on recent and up-to-dated experimental data of polarized nucleon and deuteron structure functions at the NLO accuracy of perturbative QCD. We use the Jacobi polynomials expansion technique to do the required analyses. To achieve a more realistic estimation of the PPDFs and observable uncertainties we employ the Hessian error propagation. Following that we apply a theoretical approach which is based on imposing Lorentz structure in the parton model to investigate the transverse momentum dependence of these PPDFs. In this approach, the transverse momentum dependent (TMD) polarized parton distributions, which are also called the helicity distributions, are related to the integrated ones. This relation is indicating the priority and importance of data analysis for PPDFs. The results show a convenient general treatment expected for TMD densities which are in fact resulted from data analysis and fitting processes of integrated PPDFs in an adequate and a proper way.

Exploring the Flavor Dependence of Partonic Transverse Momentum

2015 ◽  
Vol 37 ◽  
pp. 1560024 ◽  
Author(s):  
Marco Radici ◽  
Alessandro Bacchetta ◽  
Andrea Signori ◽  
Gunar Schnell
Keyword(s):  
Transverse Momentum ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Momentum Dependence ◽  
Parton Distributions ◽  
Average Transverse Momentum ◽  
Transverse Momentum Dependent ◽  
Transverse Momentum Dependence ◽  
Hermes Data ◽  
Fragmentation Functions

Using recently published HERMES data on multiplicities in semi-inclusive deep-inelastic scattering, we discuss the flavor dependence of unpolarized transverse-momentum dependent distribution and fragmentation functions. We find convincing indications that favored fragmentation into pions have smaller average transverse momentum than unfavored ones and fragmentation into kaons. We find weaker indications of flavor dependence in the transverse-momentum dependence of parton distributions.

scholarly journals Predictions for Transverse-Momentum Dependence in Electron-Positron Annihilation

2015 ◽  
Vol 37 ◽  
pp. 1560023
Author(s):  
Alessandro Bacchetta ◽  
Miguel García-Echevarría ◽  
Marco Radici ◽  
Andrea Signori
Keyword(s):  
Transverse Momentum ◽  
Positron Annihilation ◽  
Experimental Measurements ◽  
Momentum Dependence ◽  
Transverse Momentum Dependent ◽  
Transverse Momentum Dependence ◽  
Hermes Data ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Fragmentation Functions

We calculate the transverse momentum dependence of back-to-back production of one hadron and one jet in electron-positron annihilation, i.e., e+e- → h jet X, at Q2 = 100 GeV2. We use the parameters of the transverse-momentum-dependent (TMD) fragmentation functions we recently extracted from HERMES data at 2.4 GeV2. We apply TMD evolution according to two different approaches and using different parameters for the so-called nonperturbative part of TMD evolution. We discuss the differences in our predictions and how experimental measurements could discriminate between different implementations of TMD evolution and different choices of nonperturbative parameters.

scholarly journals Transverse-momentum dependence of cumulative pions

2000 ◽  
Vol 63 (10) ◽  
pp. 1831-1834 ◽  
Author(s):  
M. A. Braun ◽  
V. V. Vechernin
Keyword(s):  
Transverse Momentum ◽  
Momentum Dependence ◽  
Transverse Momentum Dependence

Mass and transverse momentum dependence of dielectron production inp+dandp+pcollisions at 4.9 GeV

1994 ◽  
Vol 49 (1) ◽  
pp. 314-319 ◽  
Author(s):  
H. Z. Huang ◽  
S. Beedoe ◽  
M. Bougteb ◽  
J. Cailiu ◽  
J. Carroll ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Momentum Dependence ◽  
Transverse Momentum Dependence
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