An analysis of an extensive sample of the world's data has been performed to test the hypothesis of radial scaling. We have studied the inclusive reactions p + p --+ (~* %~ or K * or p or 9) +anything to determine the behavior of the invariant cross section as a function of p,, x, = E*/E*,,,, the radial scaling variable, and s.The data cover a range in p, from 0.25 to -6.0 GeV/c and a range in d s from 3.0 to 63 GeV. For small x, and all available p, the single-particle inclusive cross sections for the reactions studied scale to a good approximation for all v ' s , even down to the kinematic threshold. For large x,, the single-particle inclusive cross sections for increasing d s show a rapid approach to the scaling limit from above. In these cases the scaling limit is always approached by v ' s z 10 GeV. Thus, data for all particles to a good approximation exhibit radial scaling at all available p, and x, over the CERN ISR energy range. A comparison of radial scaling with Feynman scaling is given. It is shown that in the Feynman case the cross sections for small xll ( x , , = p*,, /p*,.,) approach their scaling limit from below, and that the approach to the scaling limit is slower than is exhibited for the case of small x,. The systematic differences among the inclusive cross sections of various particles are discussed in the range of v ' s where radial scaling has been shown to be valid. In particular, the p, and x, distributions of E d v / d p 3 are examined.
