Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-24
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 16 figures, version to appear in Phys. Rev. D
Scientific paper
We investigate the heavy quark mass effects on the parton distribution functions in the unpolarized virtual photon up to the next-to-leading order in QCD. Our formalism is based on the QCD-improved parton model described by the DGLAP evolution equation as well as on the operator product expansion supplemented by the mass-independent renormalization group method. We evaluate the various components of the parton distributions inside the virtual photon with the massive quark effects, which are included through the initial condition for the heavy quark distributions, or equivalently from the matrix element of the heavy quark operators. We discuss some features of our results for the heavy quark effects and their factorization-scheme dependence.
Kitadono Yoshio
Sasaki Ken
Ueda Takahiro
Uematsu Tsuneo
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