Two-pion femtoscopy in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

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5.02 TeV
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We report on the results of femtoscopic analysis of pairs of identical
pions measured in p--Pb collisions at $\sqrt{s_{NN}}=5.02$~TeV as a
function of event multipicity and total pair transverse
momentum \kt. Three-dimensional sizes of the system are extracted for each
correlation function. The evolution of these homogeneity lengths with
\kt is studied, and found to change from low to high
multiplicity. System sizes and their \kt dependence are compared to
\pp and Pb--Pb collisions at comparable event multiplity. They are
also compared to hydrodynamic predictions, in order to determine
whether such description is applicable to p--Pb collisions, and if
yes, at which event multiplicity.