Kaon femtoscopy in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV

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2.76 TeV
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Femtoscopy allows for measurements of the space-time characteristics of particle production
using correlations resulting from the effects of quantum statistics and final state interactions.
We present the results of femtoscopic analyses for charged and neural kaons measured by ALICE
in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. Kaon femtoscopy is a substantial supplement to
that of pions because it allows one to distinguish between different model scenarios working
equally well for pions.
Particularly, we compare the measured 3D kaon radii with a model where the hydrodynamic
phase is followed by a hadronic rescattering phase and a purely hydrodynamical calculation.
The latter predicts an approximate $m_{\mathrm{T}}$ scaling of source radii obtained from
pion and kaon correlations. This $m_{\mathrm{T}}$ scaling appears broken in our data, which
indicates strong rescattering in the hadronic phase at LHC energies.
The decoupling time of the system is also estimated using the three-dimensional femtoscopic
analysis for kaons, and compared with such estimates obtained from pions.