Parton densities and structure functions of nucleons and light nuclei based on the modified chiral quark-exchange model

Abstract

We investigate the structure of the light nuclei based on the modified chiral quark model $(\ensuremath{\chi}\mathrm{QM})$, for the first time. To this end, we first calculate the parton distribution functions (PDFs) of the bounded nucleons using the $\ensuremath{\chi}\mathrm{QM}$ and then compute those of the light nuclei. For this purpose, it is first needed to obtain the bare quark densities inside the bounded nucleons of the nucleus. These bare distributions are calculated by applying the quark exchange model (QEM) in this article. Finally, we obtain the quark, antiquark, and gluon distributions and also the structure functions (SFs) of the bound state nucleons and the light nuclei at low ${Q}^{2}$ scale $({Q}^{2}=0.35\phantom{\rule{0.16em}{0ex}}\phantom{\rule{4pt}{0ex}}{\mathrm{GeV}}^{2})$. These distributions can be evolved to the higher scales using DGLAP evolution equations. It is shown that the results of our theoretical framework are in good agreement with the experimental data and they also have appropriate behavior in comparison with the different parametrization models.