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Scattering studies with low-energy kaon-proton femtoscopy in proton-proton collisions at the LHC

The ALICE collaboration
Phys.Rev.Lett. 124 (2020) 092301, 2020

Abstract (data abstract)
The study of the strength and behaviour of the antikaon-nucleon ($\mathrm{\overline{K}N}$) interaction constitutes one of the key focuses of the strangeness sector in low-energy Quantum Chromodynamics (QCD). In this letter a unique high-precision measurement of the strong interaction between kaons and protons, close and above the kinematic threshold, is presented. The femtoscopic measurements of the correlation function at low pair-frame relative momentum of (K$^+$ p $\oplus$ K$^-$ $\overline{\mathrm{p}}$ ) and ( K$^-$ p $\oplus$ K$^+$ $\overline{\mathrm{p}}$) pairs measured in pp collisions at $\sqrt{s}$\s\ = 5, 7 and 13 TeV are reported. A structure observed around a relative momentum of 58~MeV/$c$ in the measured correlation function of ( K$^-$ p $\oplus$ K$^+$ $\overline{\mathrm{p}}$) with a significance of 4.4 $\sigma$ constitutes the first experimental evidence for the opening of the $(\mathrm{\overline{K}^0 n} \oplus \mathrm{K^0 \overline{n}})$ isospin breaking channel due to the mass difference between charged and neutral kaons. The measured correlation functions have been compared to J\"ulich and Kyoto models in addition to the Coulomb potential. The high-precision data at low relative momenta presented in this work prove femtoscopy to be a powerful complementary tool to scattering experiments and provide new constraints above the $\mathrm{\overline{K}N}$ threshold for low-energy QCD chiral models.

  • Table 1a

    Data from Figure 1 (left panel)

    10.17182/hepdata.93732.v1/t1

    K-p correlation function in p-p collisions at $\sqrt{s}=5$ TeV.

  • Table 1b

    Data from Figure 1 (middle panel)

    10.17182/hepdata.93732.v1/t2

    K-p correlation function in p-p collisions at $\sqrt{s}=7$ TeV.

  • Table 1c

    Data from Figure 1 (right panel)

    10.17182/hepdata.93732.v1/t3

    K-p correlation function in p-p collisions at $\sqrt{s}=13$ TeV.

  • Table 2a

    Data from Figure 2 (first panel)

    10.17182/hepdata.93732.v1/t4

    $\overline{\mathrm{K}}$-p correlation function in p-p collisions at $\sqrt{s}=5$ TeV.

  • Table 2b

    Data from Figure 2 (second panel)

    10.17182/hepdata.93732.v1/t5

    $\overline{\mathrm{K}}$-p correlation function in p-p collisions at $\sqrt{s}=7$ TeV.

  • Table 2c

    Data from Figure 2 (third panel)

    10.17182/hepdata.93732.v1/t6

    $\overline{\mathrm{K}}$-p correlation function in p-p collisions at $\sqrt{s}=13$ TeV.

  • Table 2d

    Data from Figure 2 (fourth panel)

    10.17182/hepdata.93732.v1/t7

    Combination of $\overline{\mathrm{K}}$-p correlation function in p-p collisions.

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