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The freezeout conditions in proton-proton collisions at$\sqrt{s_{\textrm{NN}}}= 200$, $900$ and $7000$ GeV have been extracted by fitsto the mean hadron yields at mid-rapidity within the framework of thestatistical model of an ideal gas of hadrons and resonances in the grandcanonical ensemble. The variation of the extracted freezeout thermal parametersand the goodness of the fits with $\sqrt{s_{\textrm{NN}}}$ are discussed. Wefind the extracted temperature and baryon chemical potential of the freezeoutsurface to be similar in p+p and heavy ion collisions. On the other hand, thethermal behaviour of the strange hadrons is qualitatively different in p+p ascompared to A+A. We find an additional parameter accounting for non-equilibriumstrangeness production is essential for describing the p+p data. This is incontrast to A+A where the non-equilibrium framework could be successfullyreplaced by a sequential and complete equilibrium model with an early freezeoutof the strange hadrons.

Freezeout conditions in proton-proton collisions at the top RHIC and LHC energies