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Measuring K$^0_{\rm S}$K$^{\rm{\pm}}$ interactions using pp collisions at $\sqrt{s}=7$ TeV

The ALICE collaboration
Phys.Lett. B790 (2019) 22-34, 2019

Abstract (data abstract)
Measuring K$^0_{\rm S}$K$^{\rm \pm}$ interactions using pp collisions at $\mathbf {\sqrt{s}=7}$ TeV LHC ALICE collaboration K0sKch femtoscopy from 7 TeV pp collisions minimum bias trigger, -0.8 < eta < 0.8 We present the first measurements of femtoscopic correlations between the K$^0_{\rm S}$ and K$^{\rm \pm}$ particles in pp collisions at $\sqrt{s}=7$ TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding solely 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$^{\rm +}$. Results of the present study are compared with those from identical-kaon femtoscopic studies also performed with pp collisions at $\sqrt{s}=7$ TeV by ALICE and with a K$^0_{\rm S}$K$^{\rm \pm}$ measurement in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV. Combined with the Pb-Pb results, our pp analysis is found to be compatible with the interpretation of the $a_0(980)$ having a tetraquark structure instead of that of a diquark.

  • Figure 1a

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    Raw K0s K+ correlation function for all kT

  • Figure 1b

    page 5

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    Raw K0s K+ correlation function for kT < 0.85 GeV/c

  • Figure 1c

    page 5

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    Raw K0s K+ correlation function for kT > 0.85 GeV/c

  • Figure 3a

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    C(k*)/(quadratic baseline) for K0s K+ and all kT, systematic uncertainties negligible for k*>0.06 GeV/c

  • Figure 3b

    page 9

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    C(k*)/(quadratic baseline) for K0s K+ and kT < 0.85 GeV/c, systematic uncertainties negligible for k*>0.06 GeV/c

  • Figure 3c

    page 9

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    C(k*)/(quadratic baseline) for K0s K+ and kT > 0.85 GeV/c, systematic uncertainties negligible for k*>0.06 GeV/c

  • Figure 3d

    page 9

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    C(k*)/(quadratic baseline) for K0s K- and all kT, systematic uncertainties negligible for k*>0.06 GeV/c

  • Figure 3e

    page 9

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    C(k*)/(quadratic baseline) for K0s K- and kT < 0.85 GeV/c, systematic uncertainties negligible for k*>0.06 GeV/c

  • Figure 3f

    page 9

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    C(k*)/(quadratic baseline) for K0s K- and kT > 0.85 GeV/c, systematic uncertainties negligible for k*>0.06 GeV/c

  • Figure 5a_pp

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    R vs. kT for 7 TeV pp averaged over K0s K+ and K0s K- with Achasov2 parameters

  • Figure 5a_PbPb

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    R vs. kT for 2.76 TeV/nucleon Pb Pb averaged over K0s K+ and K0s K- with Achasov2 parameters

  • Figure 5b_pp

    page 11

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    lambda/purity vs. kT for 7 TeV pp averaged over K0s K+ and K0s K- with Achasov2 parameters

  • Figure 5b_PbPb

    page 11

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    lambda/purity vs. kT for 2.76 TeV/nucleon Pb Pb averaged over K0s K+ and K0s K- with Achasov2 parameters

  • Figure 6a_K0Kch

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    R vs. kT for 7 TeV pp averaged over K0s K+ and K0s K- and with Achasov2 parameters

  • Figure 6a_K0K0

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    R vs. kT for 7 TeV pp --> K0s K0s averaged over event multiplicity

  • Figure 6a_KchKch

    page 12

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    R vs. kT for 7 TeV pp --> K+- K+- averaged over event multiplicity and averaged between K+ and K-

  • Figure 6b_K0Kch

    page 12

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    lambda/purity vs. kT for 7 TeV pp averaged over K0s K+ and K0s K- and with Achasov2 parameters

  • Figure 6b_K0K0

    page 12

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    lambda/purity vs. kT for 7 TeV pp --> K0s K0s averaged over event multiplicity

  • Figure 6b_KchKch

    page 12

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    lambda/purity vs. kT for 7 TeV pp --> K+- K+- averaged over event multiplicity and averaged between K+ and K-

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