332 research outputs found
The CCFM uPDF evolution uPDFevolv
uPDFevolv is an evolution code for TMD parton densities using the CCFM
evolution equation. A description of the underlying theoretical model and
technical realization is given together with a detailed program description,
with emphasis on parameters the user may want to changeComment: Code and description on https://updfevolv.hepforge.org Version to be
published in EPJ
Character amenability of Banach algebras
We introduce the notion of character amenable Banach algebras. We prove that character amenability for either of the group algebra L(1)(G) or the Fourier algebra A(G) is equivalent to the amenability of the underlying group G. Character amenability of the measure algebra M(G) is shown to be equivalent to G being a discrete amenable group. We also study functorial properties of character amenability. For a commutative character amenable Banach algebra A, we prove all cohomological groups with coefficients in finite-dimensional Banach A-bimodules, vanish. As a corollary we conclude that all finite-dimensional extensions of commutative character amenable Banach algebras split strongly
Polarized Deeply Inelastic Scattering (DIS) Structure Functions for Nucleons and Nuclei
We extract parton distribution functions (PDFs) and structure functions from
recent experimental data of polarized lepton-DIS on nucleons at next-to-leading
order (NLO) Quantum Chromodynamics. We apply the Jacobi polynomial method to
the DGLAP evolution as this is numerically efficient. Having determined the
polarized proton and neutron spin structure, we extend this analysis to
describe 3He and 3H polarized structure functions, as well as various sum
rules. We compare our results with other analyses from the literature.Comment: LaTeX, 12 pages, 11 figures, 6 tables. Update to match published
versio
Effectiveness of videogames on balance and fear of falling in chronic stroke patient
Objectives: Balance disorder is one of the most common problems after stroke causes falling and fear of falling in some patients. The balance based video games are newly used in people with motor problems. It is very important to use different interventions for balance issues. The aim of this study is to determine the effectiveness of videogame on balance and fear of falling in one participant. Methods: This experimental study was done in a single subject system, A-B design for one patient with chronic stroke. This method including repetitive measures conducted in two phases, baseline and then twelve intervention sessions. Berg Balance Scale, Timed up and go, Functional Reach, the maximum weight bearing in different directions and the deviation from center were conducted for balance assessing. Fear of falling questionnaire was used to assess fear of falling. Analysis of results was done by C-statistic, Bayesian factor, Mann Whitney U, and visual analysis graphs. Results: The results showed significant improvement for balance skills, the maximum force produced by lower extremities and reducing fear of falling parameters. But the deviation from center graphs did not showed distinct pattern. Discussion: All analysis confirmed the efficacy of videogames on balance skills and fear of falling improvement. However, the deviation from center did not show improvement and it seems to need more studies
Determination of collinear and TMD photon densities using the Parton Branching method
We present the first determination of transverse momentum dependent (TMD)
photon densities with the Parton Branching method. The photon distribution is
generated perturbatively without intrinsic photon component. The input
parameters for quarks and gluons are determined from fits to precision
measurements of deep inelastic scattering cross sections at HERA. The TMD
densities are used to predict the mass and transverse momentum spectra of very
high mass lepton pairs from both Drell-Yan production and Photon-Initiated
lepton processes at the LHC.Comment: 5 pages, 4 figure
On the role of soft gluons in collinear parton densities
The role of soft (non-perturbative) gluons in collinear parton densities is
investigated with the Parton Branching method as a solution of the DGLAP
evolution equations. It is found that soft gluons contribute significantly to
collinear parton densities.
Within the Parton Branching frame, the Sudakov form factor can be split into
a perturbative and non-perturbative part. The non-perturbative part can be
calculated analytically under certain conditions. It is shown that the
inclusion of soft (non-perturbative) gluons to the parton density evolution is
essential for the proper cancellation of divergent terms.
It is argued that the non-perturbative part of the Sudakov form factor has
its correspondence in Transverse Momentum Dependent parton distributions.
Within the Parton Branching approach, this non-perturbative Sudakov form factor
is constrained by fits of inclusive, collinear parton densities.
We show that the non-perturbative Sudakov form factor and soft gluon
emissions are essential for inclusive distributions (collinear parton densities
and Drell-Yan transverse momentum spectra), while those soft gluons play
essentially no role in final state hadron spectra.Comment: Significantly updated including studies on parton shower and
hadronizatio
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