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

The ALICE collaboration
No Journal Information, 2017

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.

  • Figure 2a

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    Out projection of raw 3D LCMS K+- K+- correlation function for 0.2 < kT < 0.4 GeV/c bin.

  • Figure 2b

    page 7 of arXiv:17...

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    Side projection of raw 3D LCMS K+- K+- correlation function for 0.2 < kT < 0.4 GeV/c bin

  • Figure 2c

    page 7 of arXiv:17...

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    Long projection of raw 3D LCMS K+- K+- correlation function for 0.2 < kT < 0.4 GeV/c bin

  • Figure 3a

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    Out projection of raw 3D LCMS KS KS correlation function for 1.0 < kT < 1.5 GeV/c bin

  • Figure 3b

    page 9 of arXiv:17...

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    Side projection of raw 3D LCMS KS KS correlation function for 1.0 < kT < 1.5 GeV/c bin

  • Figure 3c

    page 9 of arXiv:17...

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    Long projection of raw 3D LCMS KS KS correlation function for 1.0 < kT < 1.5 GeV/c bin

  • Figure 4a

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    Rout vs. mT for PI+- PI+- for centrality 0-10%

  • Figure 4b

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    Rside vs. mT for PI+- PI+- for centrality 0-10%

  • Figure 4c

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    Rlong vs. mT for PI+- PI+- for centrality 0-10%

  • Figure 4d

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    Rout vs. mT for PI+- PI+- for centrality 10-30%

  • Figure 4e

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    Rside vs. mT for PI+- PI+- for centrality 10-30%

  • Figure 4f

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    Rlong vs. mT for PI+- PI+- for centrality 10-30%

  • Figure 4g

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    Rout vs. mT for PI+- PI+- for centrality 30-50%

  • Figure 4h

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    Rside vs. mT for PI+- PI+- for centrality 30-50%

  • Figure 4k

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    Rlong vs. mT for PI+- PI+- for centrality 30-50%

  • Figure 5a

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    Rout vs. mT for PI+- PI+- for centrality 0-5%

  • Figure 5b

    page 11 of arXiv:17...

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    Rside vs. mT for PI+- PI+- for centrality 0-5%

  • Figure 5c

    page 11 of arXiv:17...

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    Rlong vs. mT for PI+- PI+- for centrality 0-5%

  • Figure 5d

    page 11 of arXiv:17...

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    Ratio Rout/Rside vs. mT for PI+- PI+- for centrality 0-5%

  • Figure 7a

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    Ratio Rout/Rside vs. mT for PI+- PI+- for centrality 0-10%

  • Figure 7b

    page 13 of arXiv:17...

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    Ratio Rout/Rside vs. mT for PI+- PI+- for centrality 10-30%

  • Figure 7c

    page 13 of arXiv:17...

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    Ratio Rout/Rside vs. mT for PI+- PI+- for centrality 30-50%

  • Figure 8

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    Rlong^2 vs. mT for PI+- PI+- for centrality 0-5%

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