arXiv subjects

S. Atashbar Tehrani

Publications and source records attributed to S. Atashbar Tehrani.

39 records · Page 3Linked to original sources

arXiv2004

Nuclear Parton Densities and Structure Functions

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 $F_2^A/F_2^D$ at some values of $A$ are in good agreement with the experimental data.

hep-ph↗

arXiv2003

Polarized parton distribution functions in the valon model framework, using QCD fits to Bernstein polynomials

In this paper polarized valon distribution is derived from unpolarized valon distribution. In driving polarized valon distribution some unknown parameters exist which must be determined by fitting to experimental data. Here we have used Bernstein polynomial method to fit QCD predictions for the moments of $g_1^p$ structure function, to suitably the constructed appropriate average quantities of the E143 and SMC experimental data. After calculating polarized valon distributions and all parton distributions in a valon, polarized parton density in a proton are available. The results are used to evaluate the spin components of proton. It turns out that the results of polarized structure function are in good agreement with all available experimental data on $g_{1}^p$ of proton.

hep-ph↗

arXiv2002

Polarized Parton Distributions in the Valon Model

We calculated the polarized parton distributions in leading order approximation in QCD from valon model. Polarized structure function of the nucleon are analyzed in the polarized valon model in which a nucleon is assumed to be a bound state of three polarized valence quark cluster(valons). It is shown that the results of the model calculation agree rather well with the SMC and available experimental data . Our results for $Γ_{1}$ of hadron and deuteron are in good agreement with experimental data for some value of $Q^{2}$.

hep-ph↗