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Measuring K$^0_{\rm S}$K$^{\rm \pm}$ interactions using Pb-Pb collisions at ${\sqrt{s_{\rm NN}}=2.76}$ TeV

The ALICE collaboration
Phys.Lett. B774 (2017) 64-77, 2017

Abstract
We present the first ever measurements of femtoscopic correlations between the K$^0_{\rm S}$ and K$^{\rm \pm}$ particles. The analysis was performed on the data from Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding via the $a_0(980)$ resonance. The extracted kaon source radius and correlation strength parameters for K$^0_{\rm S}$K$^{\rm -}$ are found to be equal within the experimental uncertainties to those for K$^0_{\rm S}$K$^{\rm +}$. Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, mass and coupling parameters for the $a_0$ resonance are constrained. Our results are also compatible with the interpretation of the $a_0$ having a tetraquark structure over that of a diquark.

  • Figure 1a

    page 5 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t1

    Raw K0s K+ correlation function for all kT bin

  • Figure 1b

    page 5 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t2

    Raw K0s K+ correlation function for kT < 0.675 GeV/c bin

  • Figure 1c

    page 5 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t3

    Raw K0s K+ correlation function for kT > 0.675 GeV/c bin

  • Figure 2a

    page 7 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t4

    C(k*)/(linear baseline fit) for K0s K+ and all kT bin

  • Figure 2b

    page 7 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t5

    C(k*)/(linear baseline fit) for K0s K+ and kT < 0.675 GeV/c bin

  • Figure 2c

    page 7 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t6

    C(k*)/(linear baseline fit) for K0s K+ and kT > 0.675 GeV/c bin

  • Figure 2d

    page 7 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t7

    C(k*)/(linear baseline fit) for K0s K- and all kT bin

  • Figure 2e

    page 7 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t8

    C(k*)/(linear baseline fit) for K0s K- and kT < 0.675 GeV/c bin

  • Figure 2f

    page 7 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t9

    C(k*)/(linear baseline fit) for K0s K- and kT > 0.675 GeV/c bin

  • Figure 3a

    page 9 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t10

    R vs. kT for K0s K- with Achasov1 parameters

  • Figure 3b

    page 9 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t11

    lambda vs. kT for K0s K- with Achasov1 parameters

  • Figure 3c

    page 9 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t12

    R vs. kT for K0s K+- with Achasov1 parameters and linear fit

  • Figure 3d

    page 9 of arXiv:1705.04929

    10.17182/hepdata.80522.v1/t13

    lambda vs. kT for K0s K+- with Achasov1 parameters and linear fit

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