Abstract
New experimental data on inclusive cross section of neutral-vector-meson (ω 0, ϕ, K 0 ) production in proton-proton collisions at $$ \sqrt s $$ = 200 GeV obtained at RHIC are analyzed in the framework of z scaling. Properties of z-presentation are used to predict hadron yields over a wide range of transverse momentum p T and collisions energy $$ \sqrt s $$ . The next-to-leading-order perturbative QCD calculations of inclusive cross sections of π 0 mesons produced in pp and $$ \bar p $$ collisions over a wide range of $$ \sqrt s $$ and p T are compared with ISR, S $$ \bar p $$ pS, RHIC data and predictions of z scaling. The dependence of the spectra in p T and z presentations for different parton distribution and fragmentation functions is studied. The sensitivity of the obtained results to the choice of the renormalization (µ R ), initial-state factorization (µ F ), and final-state factorization (fragmentation) (µ H ) scales is verified. It is shown that self-similar features of particle production dictated by the z scaling give strong restriction on the asymptotic behavior of the inclusive spectra in high-p T region.
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