  The shapes of invariant differential cross section for identified pi,K, p and
pbar production as function of transverse momentum measured in pp collisions by
the PHENIX detector are analyzed. Simultaneous fit of these data to the sum of
exponential and power-law terms show significant difference in the exponential
term contributions. This effect qualitatively explains the observed shape of
the experimental K/pi and p/pi yield ratios measured as function of transverse
momentum of produced hadrons. A picture with two types of mechanisms for hadron
production is given.
