Systematic study of physics biases caused by different multiplicity estimators

Systematic study of physics biases caused by different multiplicity estimators in pp collisions was done by analyzing pseudorapidity distributions and $p_{t}$ spectra. Analysis was done in several steps. The analysis was done in several steps. First we found pseudorapidity distributions in different $\eta$ ranges and given centrality classes. For this purpose both real data and Monte Carlo events were used.\nIn next steps we worked only with MC pp events. We analysed $p_{t}$ spectra of four different particle species from most central events. Finally we used the Blast-wave model to fit these spectra.