8 citations
2 papers
hep-ph2008★ 8 cited
Valence Quark Polarization In the Nucleon And the Deuteron Data
Firooz Arash, Fatemeh Taghavi-Shahri
Within the framework of the so-called "valon" model, we argue that a substantial part of the nucleon spin, about 40%, is carried by the polarized valence quarks. The remaining is t…
math.DG2008
Symmetry of Quadratic Homogeneous Differential Systems
Mehdi Nadjafikhah, Ali Mahdipour-Shirayeh
In this paper, the symmetry group of a differential system of n quadratic homogeneous first order ODEs of n variables is studied. For this purpose, we consider the action of both p…