Ali Naghi Khorramian | Searcharxiv

arXiv2000

From Constituent Quark to Hadron Structure in the Next-to-Leading Order: Nucleon and Pion

We calculate the partonic structure of constituent quark in the Next-to-Leading Order for the first time. The structure of any hadron can be obtained thereafter using a convolution method. Such a procedure is used to generate the structure function of proton and pion in NLO. It is shown that while the constituent quark structure is generated purely perturbatively and accounts to most part of the hadronic structure, there is a few percent contributions coming from the nonperturbative sector in the hadronic structure. This contribution plays the key role in explaining the SU(2) symmetry breaking of the nucleon sea and the observed violation of Gottfried sum rule. These effects are calculated. Excellent agreement with data in a wide range of $x=[10^{-6}, 1]$ and $Q^{2}=[0.5, 5000]$ $GeV^{2}$ is reached for proton structure function. We have also calculated Pion structure and compared it with the existing data. Again nice agreement is achieved.

hep-ph↗

arXiv1999

Constituent Quarkstructur and $F^{p}_{2}$ Data

We have calculated the partonic structure of a constituent quark in the leading order in QCD for the first time and examined its ipmlications on the proton structure function, $F^{p}_{2}, data from HERA. It turned out that although qualitatively it agrees with the data but for a finer refinement we need to consider an {\it{inherent}} component due to gluons which act as the binding agent between constituents quarks in the proton. Good agreement with nucleon structure function, $F_{2}(x,Q^{2})$, for a wide range of $x=[10^{-6} ,1]$ and $Q^{2}=[0.5, 5000]$ $GeV^{2}$ is reached. {\bf{PACS Numbers 13.60 Hb, 12.39.-x, 13.88 +e, 12.20.Fv}}

hep-ph↗