Abstract
The quark distribution functions of the meson (q-q̅ system) and the nucleon (both q-diquark system and symmetric Y shape system) are calculated using the yo-yo mode of the classical string model. The valence quark distributions of the proton are consistent with intermediate value of q-diquark and symmetric Y shape calculation. Using the Weizsäcker-Williams approximation, the gluon distribution function is obtained from the Poynting vector of the flux tube which has the same energy-momentum relation as the string.
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