Abstract
We apply a microcanonical statistical model to investigate hadron production in $pp$ collisions. The parameters of the model are the energy $E$ and the volume $V$ of the system, which we determine via fitting the average multiplicity of charged pions, protons, and antiprotons in $pp$ collisions at different collision energies. We then make predictions of mean multiplicities and mean transverse momenta of all identified hadrons. Our predictions on nonstrange hadrons are in good agreement with the data, the mean transverse momenta of strange hadron as well. However, the mean multiplicities of strange hadrons are overpredicted. This agrees with canonical and grand-canonical studies, where a strange suppression factor is needed. We also investigate the influence of event-by-event fluctuations of the $E$ parameter.
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