  Transverse momentum spectra of charged particles including pions, kaons and
(anti-)protons measured by ALICE experiment in the pT range of 0.1-2.5 GeV/c
and pseudorapidity less than 0.5 are studied in pp collisions at 900 GeV center
of mass energy using modified Hagedorn function with embedded transverse flow
velocity and are compared to the predictions of EPOS-LHC, Pythia, QGSJET and
Sibyll models. We find that the average transverse flow velocity decreases with
increasing the mass of the particle while the kinetic freeze-out temperature
extracted from the function increases with the particle's mass. The former
varies from 0.36 c to 0.25 c for pions to protons while the latter from 76 MeV
to 95 MeV respectively. The fit of the models predictions also yield the same
values for T0 and beta as the experimental data. The only difference is in the
values of n, and N0 which yields different values for different models. The
EPOS-LHC, Pythia, and QGSJET models reproduce the data in most of the pT range
for pions, EPOS-LHC and Sibyll for kaons up to 1.5 GeV/c and EPOS-LHC for
protons up to 1.6 GeV/c. The model simulations also reproduced the behavior of
increasing average transverse momentum with mass reported by the ALICE
experiment.
