We present a study of p anti-p collisions at s**(1/2) = 1800 and 630
GeV collected using a minimum bias trigger by the CDF experiment in which
the data set is divided into two classes corresponding to "soft" and "hard"
interactions. For each sub-sample, the analysis includes measurements of
the multiplicity, transverse momentum (p(t)) spectrum, and the average p(t)
and event-by-event p(t) dispersion as a function of multiplicity. A
comparison of results shows distinct differences in the behavior of the two
samples as a function of the center of mass (CM) energy. We find evidence
that the properties of the soft sample are invariant as a function of CM
energy.
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Updated: Thursday, 2002 April 18 15:55:28 CDT automatically from input from Carol Picciolo