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We investigate the nucleon and pion gluon distribution functions in theframework of holographic QCD, focusing on the small Bjorken x region. Based onan approximate relation, the gluon distributions are extracted from structurefunctions of the unpolarized deep inelastic scattering which can be calculatedwith a holographic QCD model, assuming the Pomeron exchange. All the adjustableparameters of the model are determined with the HERA data of the protonstructure functions. We explicitly show that the extracted proton gluondistribution is consistent with results of the recent global QCD analysis. Thestructure functions of the pion can be computed without any additionalparameter, which enables us to predict its gluon distribution also. We findthat the resulting pion gluon density is smaller than the proton's, and agreeswith the recent global QCD analysis result within the uncertainties.

Extraction of gluon distributions from structure functions at small x in holographic QCD