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Experimental transverse momentum spectra of identified particles in p-Pb collisions at 5. 02 TeV show many similarities to the corresponding Pb-Pb results, the latter ones usually being interpreted in terms of hydrodynamic flow. We analyze these data using epos3, an event generator based on a 3D+1 viscous hydrodynamical evolution starting from flux-tube initial conditions, which are generated in the Gribov-Regge multiple scattering framework. An individual scattering is referred to as Pomeron, identified with a parton ladder, eventually showing up as flux tubes (or strings). Each parton ladder is composed of a perturbative QCD hard process, plus initial- and final-state linear parton emission. Nonlinear effects are considered by using saturation scales Qₒ, depending on the energy and the number of participants connected to the Pomeron in question. We compute transverse momentum (pₓ) spectra of pions, kaons, protons, lambdas, and baryons in p-Pb and p-p scattering, compared to experimental data and many other models. In this way we show in a quantitative fashion that p-Pb data (and even p-p ones) show the typical ``flow effect'' of enhanced particle production at intermediate pₓ values, more and more visible with increasing hadron mass.
Werner et al. (Mon,) studied this question.