A nonextensive thermodynamical equilibrium approach in e+e- → hadrons

We show that the inclusion of long distance effect, expected in strong interactions, through a nonextensive thermodynamical approach is able to explain the experimental distribution of the transverse momentum of the hadrons with respect to the jet axis (pr) e(+)e(-) --> hadron reaction. The observed deviation from the exponential behavior, predicted by the Boltzmann-Gibbs thermodynamical treatment, is automatically recovered by the nonextensive Tsallis statistics used here. We fitted the observed p(t) spectrum in the range of 14-161 GeV and obtained, besides a good fit, the theoretically important fact that the temperature becomes independent of the primary energy. (C) 2000 Elsevier Science B.V. All rights reserved.