Research Papers in Physics and Astronomy

 

Date of this Version

April 2002

Comments

Published by American Physical Society. Phys. Rev. D 65, 072005 (2002). http://prd.aps.org. Copyright © 2002 American Physical Society. Permission to use.

Abstract

We present a study of pp̅ collisions at √s =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 subsample, the analysis includes measurements of the multiplicity, transverse momentum (pT) spectrum, and the average pT and event-by-event pT 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 (c.m.) energy. We find evidence that the properties of the soft sample are invariant as a function of c.m. energy.

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