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

Abstract (data abstract)
Measuring K$^0_{\rm S}$K$^0_{\rm S}$ and K$^{\rm \pm}$K$^{\rm \pm}$ three-dimensional femtoscopic correlations using Pb-Pb collisions at $\mathbf {\sqrt{s_{\rm NN}}=2.76}$ TeV LHC ALICE collaboration KchKch and K0sK0s femtoscopy from 2.76 TeV/nucleon Pb-Pb collision 0-10%, 10-30% and 30-50% centrality, -0.8 < eta < 0.8 We present the results of three-dimensional femtoscopic analyses for charged and neutral kaons recorded by ALICE in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV. The $m_{\mathrm{T}}$ scaling predicted by pure hydrodynamic models appears to be broken in our data, which indicates the importance of the hadronic rescattering phase at LHC energies. A $k_{\mathrm{T}}$ scaling of pion and kaon source radii is observed instead. The time of maximal emission of the system is estimated using the three-dimensional femtoscopic analysis for kaons. The measured emission time is larger than that of pions. Our observations are well supported by the hydrokinetic model predictions. For correlation functions (Figure 2, Figure 3) the errors are statistical only, systematic uncertainties are equal to or less than the statistical errors. For all other figures total errors are presented.

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