“School of Particles And Accelerator”
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| Paper IPM / Particles And Accelerator / 8948 |
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| Abstract: | |||||||
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The scale dependence in perturbative QCD remains on obstacle to making precise tests of the theory. To
over come the scale ambiguity while people are usually using the standard MS approach with a physical choice
of renormalization scale, we try to employ the approach of complete RG-improvement. In this approach all
ultraviolet logarithms involving the dimensionful parameter, Q, on which the observable depends are resummed,
thereby building the correct Q-dependence. Based on these two approaches, sea quark densities in the nucleon are
analyzed. To achieve the asymmetry of these densities, chiral quark model is used. To avoid from the unaccepted
Q2 behavior of sea densities inside the constituent quark, we assume that the free parameter which exists in the
vertex function of boson-quark splitting function, is Q2-dependence. Using un-symmetrized sea densities of the
nucleon, the Gottfried sum rule is calculated in these two approaches. The result of the latter one is very close
to the reported experimental value.
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